JP2006181078A - Embryo transferring instrument for livestock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a conception rate by smoothing passage through a canal of a cervix with an extending function of a head ensured, by facilitating manipulation for induction by hand from a rectum, by cutting an arrival time of the head to a uterine horn as short as possible to surely prevent damage of cervical mucus, by reducing risks of contamination, and by reducing adverse influences of a fused cryoprotective agent to an embryo. <P>SOLUTION: An instrument comprises a tube 1 which has an inserted straw S housing the embryo of a livestock and is to be attached, a piston 10 which extrudes the embryo housed in the straw S, and a head 20 which is installed on the front end of the tube 1 and discharges the embryo. The head 20 comprises an extended diameter part 23 with a prescribed length and a diameter larger than that of the tube 1, an apical part 24 having a taper part 25 which is connected to one end of the extended diameter part 23 and contacts the diameter gradually toward a chip 30, and a base point 26 having a taper part 27 which is connected to the other end of the extended diameter part 23 and contracts the diameter gradually toward the tube 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is suitable for carrying out a so-called uterine horn transplantation method in which a tube containing a livestock embryo (fertilized egg) is inserted into a livestock uterus and the embryo is pushed out of the tube and transplanted into the livestock uterus. In particular, the present invention relates to an embryo transfer device for livestock in which a tube can be inserted while expanding a cervical canal.

In general, for example, in the case of cattle as livestock, embryos transplanted with embryos have the cervix constricted and plugged with paste-like mucus due to the luteal phase of sexual cycle 7 days ± 1 day. Therefore, in order to facilitate the guidance of the transplanter into the uterine cavity and to facilitate the transplantation operation, a technique has been developed that allows a livestock embryo transplanter to have a function of expanding the cervical canal.
As this type of livestock embryo transfer device, for example, one disclosed in Japanese Patent Publication No. 8-501718 (Patent Document 1) is known.

As shown in FIG. 8, the livestock embryo transfer device includes a tube 100 into which a straw S containing a livestock embryo such as a cow is inserted, and a front end that is inserted from the rear end of the tube 100 so as to be able to advance and retreat. The piston 101 that pushes out the embryo in the straw 100 that is mounted when moving to the side, the passage 102 that is provided at the front end of the tube 100 and through which the embryo pushed out from the straw S passes, and the open end of this passage is discharged. And a head 104 having a discharge port 103 to be configured.
The distal end portion 105 of the head 104 is bulged with resin so as to be larger than the outer diameter of the tube 100, and is fixed to a metal base end portion 106. The rear end 106a of the base end portion 106 is formed in a columnar shape so that the front end Sa of the straw 100 is fitted. Further, a male screw 107 is formed at the base end portion 106, and is screwed and attached to a female screw 108 formed at the front end of the tube 100.
The embryo is housed in the straw S together with the antifreeze and frozen in advance, and is used after being thawed by putting the straw S in warm water at the time of use.

For example, when an embryo is transplanted to a cattle as a domestic animal using this livestock embryo transfer device Ka, the straw S is first put in warm water, and the embryo is melted together with a freezing agent. Then, the distal end Sa of the straw S is attached to the proximal end portion 106 of the head 104, and the straw S is inserted into the inside from the front end of the tube 100, and the proximal end portion 106 of the head 104 is screwed and fixed to the front end of the tube 100. .
Then, as shown in FIG. 9, for example, transplantation is performed by a rectal vaginal method. Specifically, the hand is inserted into the rectum of the livestock, and the livestock embryo transfer device Ka is covered with, for example, a vinyl sheath C and inserted into the vagina of the livestock, and the head 104 is held and guided from the rectum by hand. The head 104 is inserted into the cervical canal Wa through the uterine ostium, the tip of the sheath C is broken at an appropriate location, and the head 104 is inserted to the uterine horn Wb. In this case, since the head 104 is bulged, the cervical canal Wa is inserted while being expanded. Thereafter, the piston 101 of the livestock embryo transfer device Ka is pushed, the embryo in the straw S is pushed out, and the embryo is discharged into the uterine horn Wb.

JP-T 8-501718

By the way, in the above-mentioned conventional livestock embryo transplanter Ka, the head 104 is bulged and spherical, so that the cervical canal Wa can be expanded and inserted. Since the cervical canal Wa of the heifer and the first calf is in a thinly curved and contracted state, the head 104 is unstablely moved during the cervical passage operation and is caught by the ring-shaped folds, and the progress is easily inhibited. There was a problem that smooth insertion was not performed. In particular, since the head 104 is made of resin, it is easily deformed and easily caught. In addition, the head 104 is guided by holding it from the rectum to some extent, but since the head 104 is bulging and spherical, it is difficult to grasp and is not always guided by hand. In this respect, smooth insertion is performed. There was no problem.
For this reason, an unreasonable operation may be performed, or it may take too much time to insert the head 104 to the uterine horn Wb. In this case, there is a risk of damaging the cervical mucosa or bringing in bacteria. Increased and too time-consuming, the frozen antifreeze tends to have an adverse effect on the embryo, and this has caused problems such as reduced viability of the embryo and reduced fertility .

  The present invention has been made in view of the above-mentioned problems, and while making it possible to smoothly pass the cervix while ensuring the expansion function of the head, it is easy to perform a manual operation from the rectum, The time to reach the uterine horn of the head can be shortened as much as possible to ensure that damage to the cervical mucosa is prevented, the risk of introducing bacteria is reduced, and further, the adverse effect on the embryo of thawed freezing agent It aims at providing the embryo transfer device for livestock which aimed at the improvement of the conception rate by reducing this.

In order to achieve such an object, the livestock embryo transfer device of the present invention comprises a tube into which a straw containing livestock embryos is inserted and a front end side inserted from the rear end of the tube so as to be able to advance and retreat. A piston that pushes out the embryo in the attached straw when advancing to the head, and a head that is provided at the front end of the tube and that has a passage through which the embryo pushed out from the straw passes and a discharge port that discharges the embryo In a livestock embryo transfer device,
The head has a diameter-enlarged portion having a predetermined length larger than the tube and a tapered portion that is connected to one end of the expanded-diameter portion and gradually decreases in diameter from the connected portion toward the tip. And a proximal end portion having a tapered portion that is connected to the other end of the enlarged diameter portion and that gradually decreases in diameter from the connected portion toward the rear end side of the tube. It is configured with.

  Thus, for example, when an embryo is transplanted to a cow as a livestock, for example, by a rectal vaginal method, a straw is attached to a tube of a livestock embryo transfer device in advance, and the tube is inserted into the vagina of the livestock and Insert the hand into the rectum, insert the head into the cervix through the extrauterine ostium, and then hold the head through the cervix with the fingers inserted from the rectum and guide the head at the uterine horn. Insert until At this time, there is a tapered portion at the tip of the head, and there is an enlarged diameter portion following the tapered portion, so that the head is inserted while the cervical canal is expanded.

In this case, the cervical canal, especially the uterine cervix of heifers and first-born cows, is thinly bent and contracted, and the head is easily caught by a ring-shaped crease during the cervical canal operation. Since the diameter-expanded portion has a predetermined length, the portion once expanded by the tapered portion at the tip portion is held by the diameter-expanded portion, and therefore compared with the conventional bulge-type head. Thus, since the head does not move unstable and proceeds stably, smooth insertion is performed. Furthermore, when guiding the head through the cervix with fingers inserted from the rectum, the enlarged diameter part of the head has a predetermined length, so that it is easy to grip and ensures guidance by hand. In this respect, smooth insertion can be performed.
For this reason, it is possible to prevent unreasonable operations or take too much time to insert the head to the uterine horn, prevent the cervical mucosa from being damaged, and reduce the risk of introducing bacteria. .

  When the head reaches the desired uterine horn free part, the piston of the livestock embryo transfer device is pushed. Thereby, the piston pushes out the embryo inserted into the straw, and the embryo is discharged into the uterine horn. In this case, since the head advances smoothly and reaches the uterine horn free part, the insertion time can be shortened. As a result, the time for which the embryo is mixed with the thawed freezing agent generally contained in the straw is extremely short, which prevents the embryo from being adversely affected by the freezing agent and prevents the survival of the embryo. Sexual decline is prevented and the conception rate is improved.

  When the discharge of the embryo is finished, the tube of the livestock embryo transfer device is pulled out while gently rotating to finish the operation. In this case as well, the head passes through the cervical canal. At this time, since the base end portion of the head has a tapered portion, the head is pulled out while the cervical canal is expanded. Also in this case, since the enlarged diameter portion of the head has a predetermined length, a portion once expanded by the taper portion of the base end portion is held by the enlarged diameter portion, and therefore, the conventional bulge Compared to the head of the shape, the head does not move unstable and proceeds stably, so that the drawing is performed smoothly. It is prevented from being over applied, and the situation where the cervical mucosa is damaged is prevented.

  And, if necessary, the relationship between the outer diameter Da of the tube and the outer diameter Db of the expanded diameter portion is Da <Db, the outer diameter Db of the expanded diameter portion is 3 mm ≦ Db ≦ 6 mm, and the expanded diameter The predetermined length La of the part is set to 30 mm ≦ La ≦ 60 mm. A predetermined length La of the enlarged diameter portion can be sufficiently secured, and the portion once expanded by the tapered portion of the tip portion can be securely held by the enlarged diameter portion, and stable progress is performed. In addition, when guiding by holding the head via the cervix with a finger inserted from the rectum, it is easy to grasp and can be guided by hand. If it is shorter than 30 mm, the stability is poor. If it is longer than 60 mm, the insertion resistance increases and the progress tends to become unstable.

  Further, if necessary, the length Lb of the distal end portion is set to 8 mm ≦ Lb ≦ 16 mm, and the length Lc of the proximal end portion is set to 8 mm ≦ Lc ≦ 16 mm. A taper portion having a sufficient angle and length can be provided, and expansion can be achieved reliably.

  Furthermore, if necessary, the enlarged diameter part of the head is divided into an enlarged diameter part on one end side and an enlarged diameter part on the other end side, and the enlarged diameter part on the one end side and the enlarged diameter part on the other end side can be attached to and detached from each other by screw means. It is the structure connected to. When installing the straw, insert the straw from its distal end into the one end side enlarged portion, and then insert the straw from the other end side enlarged portion through the base end into the tube, The end-side expanded portion is screwed. In this case, the diameter-enlarged portion on the one end side of the head has a certain length, so that it is easy to grip, and therefore, attachment is easier than in the past and the workability of attaching the straw is improved. Be made.

  Furthermore, the inner diameter of the passage of the head is formed to be large enough to insert the straw, and a fitting portion is formed in the passage in the vicinity of the rear of the discharge port to fit the tip of the straw. . When the straw is attached, the end of the straw can be fitted and held in the fitting portion, so that the straw can be held securely, and the straw attachment workability can be further improved.

  The tube, piston and head are made of metal, and the base end of the head is welded and fixed to the front end of the tube. Manufacture is facilitated, and the base end is fixed securely and the head is fixed to the tube. Further, since the head is made of metal, it is not deformed, and when inserted into livestock, the head does not move unstable and proceeds stably, so that smooth insertion is performed. Furthermore, since the present transplanter can be used repeatedly only by disinfection, there is no waste compared to a disposable device, and the cost can be reduced.

  Further, the tip end portion and the enlarged diameter portion of the head are connected by screw means and are integrally connected by welding. Since the tip portion and the diameter-expanded portion can be separately processed and connected, manufacture is facilitated and the tip portion is securely fixed.

According to the livestock embryo transfer device of the present invention, since the enlarged diameter portion of the head has a predetermined length and is provided with a tapered portion before and after the enlarged diameter portion, when inserting the tube into the cervical canal, The cervical canal can be expanded by the tapered portion at the tip, and the expanded portion can be held by the enlarged diameter portion so that the head can pass smoothly through the cervical canal. Can be easily performed, damage to the cervical mucosa can be reliably prevented, and the risk of bringing bacteria in can be reduced.
In addition, since the passage of the head through the cervix can be made smoother, the time for the head to reach the uterine horn can be shortened as much as possible, thus reducing the adverse effects of the thawed antifreeze on the embryo and greatly increasing the conception rate. Can be improved.
Furthermore, when the tube is pulled out, the cervical canal can be expanded by the taper portion at the rear end, and the expanded portion is held by the enlarged diameter portion so that the head can pass through the cervical canal smoothly. Therefore, also in this respect, there are various effects such as prevention of damage to the cervical mucosa.

  Hereinafter, a livestock embryo transfer device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. For livestock, explanation will be given in the case of cattle. In addition, the same code | symbol is attached | subjected and demonstrated to the same thing as the above.

  As shown in FIGS. 1 to 4, the basic structure of a livestock embryo transfer device K according to an embodiment of the present invention is a tube into which a straw S in which a cow embryo as a livestock is accommodated is inserted and attached. 1, a piston 10 that pushes out an embryo in a straw S that is inserted from the rear end of the tube 1 so as to be able to advance and retract and is attached to the front end side, and an embryo that is provided at the front end of the tube 1 and is pushed out from the straw S passes And a head 20 having a discharge port 22 for discharging the passage 21 and the embryo.

  The straw S is made of resin, and the embryo is housed together with the antifreeze agent inside. A cotton plug m with which the tip of the piston 10 abuts is slidably housed inside the rear end of the straw S. The straw S is filled with an embryo and a freezing agent, and is stored in a storage container (not shown) that is cryopreserved with liquid nitrogen or the like. The straw S is taken out from the storage container when used and placed in warm water. Used by melting the agent.

  The tube 1 is a tube made of metal such as stainless steel, and is integrally provided with a flange 2 for hooking a finger when the piston 10 is advanced to the rear end. The outer diameter Da of the tube 1 is set to 2 mm ≦ Da ≦ 4 mm. In the embodiment, one with Da = 3 mm is used. The total length of the tube 1 is about 460 mm, for example. The inner diameter of the front end side of the tube 1 is such that the straw S inserted from the front end side is inserted, and is formed to be larger than the inner diameter of the rear end side. In order to position S, the step part 3 which the rear end of the straw S stops is formed.

  As shown in FIGS. 1 and 3, the piston 10 is a rod made of metal such as stainless steel, and is inserted into a straw S in the tube 1 to push out an embryo through a cotton plug m. A portion 11 and a large-diameter general portion 12 on the rear side that is provided continuously with the extrusion portion 11 and slides inside the tube 1 are provided. In addition, a disc-shaped push part 13 for placing a finger to advance the piston 10 is provided at the rear end of the piston 10.

  As shown in FIGS. 1 and 2, the head 20 is made of a metal such as stainless steel, and has a diameter-enlarged portion 23 having a larger outer diameter than that of the tube 1 and one end of the diameter-enlarged portion 23. A tip portion 24 having a tapered portion 25 that gradually decreases in diameter from the setting portion 25a toward the tip end 30 and having the discharge port 22 formed on the tip end 30 side, and a connecting portion 27a that is connected to the other end of the enlarged diameter portion 23. And a proximal end portion 26 having a tapered portion 27 that gradually decreases in diameter toward the rear end side of the tube 1.

Specifically, the enlarged diameter portion 23 of the head 20 is formed in a straight shape and divided into one end side enlarged portion 23A and the other end side enlarged portion 23B, and the one end side enlarged portion 23A and the other end side enlarged diameter. The parts 23B are detachably connected to each other by screw means 28. The screw means 28 includes a male screw 28a formed at the other end of the one end side enlarged portion 23A and a female screw 28b formed at one end of the other end side enlarged portion 23B. The male screw 28a and the female screw 28b are provided. Thus, the one end side enlarged portion 23A and the other end side enlarged portion 23B are detachably connected to each other.
Further, the relationship between the outer diameter Da of the tube 1 and the outer diameter Db of the enlarged diameter portion 23 is Da <Db, and the outer diameter Db of the enlarged diameter portion 23 is 3 mm ≦ Db ≦ 6 mm, in the embodiment. , Db = 5 mm. The predetermined length La of the enlarged diameter portion 23 is set to 30 mm ≦ La ≦ 60 mm, and in the embodiment, La = 37 mm.

Further, as shown in FIGS. 2 and 3, the tip portion 24 and the one end side enlarged diameter portion 23A of the head 20 are connected by screw means 29 including a male screw 29a and a female screw 29b, and are integrated by welding. Are combined. The length Lb of the distal end portion 24 is set to 8 mm ≦ Lb ≦ 16 mm, and in the embodiment, Lb = 12 mm.
The tip portion 24 includes a tip 30 formed in a substantially hemispherical shape, a straight portion 31 connected to the tip 30 and having a straight outer shape, and the tapered portion 25 described above. That is, the taper portion 25 is formed from the connecting portion 25a of the one end side enlarged diameter portion 23A to the straight portion 31.
A pair of discharge ports 22 are formed in the straight portion 31 along an axis in a direction orthogonal to the axis thereof, and are formed in communication with the end of the passage 21.

  Furthermore, as shown in FIG.1 and FIG.2, the other end side enlarged diameter part 23B and the base end part 26 are integrally formed, and the front end of the said tube 1 is inserted by the base end part 26 side. A fitting insertion hole 33 is formed, and the front end of the tube 1 is fitted into the fitting insertion hole 33 and welded, whereby the other-end-side enlarged diameter portion 23B and the base end portion 26 are integrated with the front end portion of the tube 1. It is fixed by welding. Manufacture is facilitated, and the fixing of the base end portion 26 is ensured and the fixing of the head 20 to the tube 1 is ensured. The taper part 27 of the base end part 26 is formed from the continuous part 27a with the other end side enlarged diameter part 23B to the outer surface of the tube 1. The length Lc of the base end portion 26 is set to 8 mm ≦ Lc ≦ 16 mm, and in the embodiment, Lb = 10 mm.

  Furthermore, the inner diameter of the passage 21 of the head 20 is formed such that the straw S is inserted, and the inner diameter of the passage 21 near the rear of the discharge port 22 is gradually reduced from the outer diameter of the straw S. It is formed as a fitting size 34 that is formed to have a diameter that is fitted and held at the tip end Sa of the straw S.

Therefore, when an embryo is transplanted to a cattle as a livestock by the livestock embryo transfer device K according to this embodiment, it is performed as follows.
First, the embryo transfer device K for livestock is thoroughly washed before the transplantation operation and sterilized or boiled and disinfected with ethylene oxide gas, autoclave, or the like. Moreover, the straw S is put into warm water, and the embryo is thawed together with a freezing agent. Straw S should be thoroughly disinfected with cotton soaked with rubbing alcohol.

  Then, the one end side enlarged portion 23A side of the head 20 is removed from the other end side enlarged portion 23B, the straw S is inserted into the one end side enlarged portion 23A from the tip end Sa, and the straw is inserted into the fitting portion 34 of the passage 21. The tip Sa of S is fitted and held. Thereafter, the straw S is inserted into the tube 1 from the other end side enlarged portion 23B through the base end portion 26, and the male screw 28a on the one end side enlarged portion 23A side is screwed into the female screw 28b on the other end side enlarged portion 23B. And fix. In this case, the enlarged diameter portion 23A on the one end side of the head 20 has a certain length, so that it is easy to grip, and therefore, attachment is easier than in the prior art, and the straw S is attached. Is improved. Further, since the tip of the straw S can be fitted and held in the fitting portion 34, the holding of the straw S is ensured, and the workability of installing the straw S is further improved.

  On the other hand, in the case of embryo recipient cows, the vulva is cleaned and disinfected after the retention. Then, as shown in FIG. 5, for example, the transplantation is performed by a rectal vaginal method. Specifically, as shown in FIG. 5A, a tube 1 of a livestock embryo transfer device K equipped with a straw S is covered with a sheath C such as sterilized vinyl and inserted into the vagina of the livestock. A hand is inserted into the rectum (see FIG. 9), and the head 20 is inserted into the cervical canal Wa through the extrauterine mouth. Then, as shown in FIG. 5 (b), after guiding into the cervical canal Wa, the tip of the sheath C is pulled and punctured, and the head 20 is held via the cervix with fingers inserted from the rectum. While guiding, the tube 1 is lightly pushed forward, and the head 20 is inserted to the uterine horn Wb. At this time, since the distal end portion 24 of the head 20 has a tapered portion 25 and the enlarged diameter portion 23 continues from the tapered portion 25, the head 20 is inserted while the cervical canal Wa is expanded.

In this case, since the cervical canal Wa, especially the uterine cervical canal Wa of a heifer or a first-born cow, is thinly bent and contracted, the head 20 is easily caught by a ring-shaped fold when passing through the cervical canal, and the progress is easily inhibited. However, since the enlarged diameter portion 23 of the head 20 has a predetermined length, the portion once expanded by the tapered portion 25 of the distal end portion 24 is held by the enlarged diameter portion 23, so that the conventional Compared with the bulging-type head 20, the head 20 does not move unstable and proceeds stably, so that smooth insertion is performed. Further, since the head 20 is made of metal, it is not deformed. Also in this respect, the head 20 does not move in an unstable manner and proceeds stably, so that smooth insertion is performed. Furthermore, when the head 20 is guided through the cervix with fingers inserted from the rectum, the diameter-expanded portion 23 of the head 20 has a predetermined length, so that it is easy to grasp and is guided by hand. Thus, smooth insertion can be performed.
For this reason, it is possible to prevent an unreasonable operation and it takes too much time to insert the head 20 to the uterine horn Wb, prevent a situation where the cervical mucosa is damaged, and reduce the risk of bringing bacteria in. Is done.

  Then, as shown in FIG. 5 (c), when the head 20 reaches the target uterine horn free part, the piston 10 of the livestock embryo transfer device K is pushed. Thereby, the pushing part 11 of the piston 10 is inserted into the straw S in the tube 1 to push out the embryo through the cotton plug m, and the embryo is discharged into the uterine horn Wb. In this case, since the head 20 proceeds smoothly and reaches the uterine horn free part as described above, the insertion time is shortened, and accordingly, the situation where the antifreeze melted in the straw S adversely affects the embryo is prevented. Is done. Therefore, a decrease in embryo viability is prevented, and the conception rate is improved.

  When the discharge of the embryo is finished, the tube 1 of the livestock embryo transfer device K is extracted while gently rotating to finish the operation. In this case as well, the head 20 passes through the cervical canal Wa. At this time, the proximal end portion 26 of the head 20 has a tapered portion 27 and the enlarged diameter portion 23 following the tapered portion 27. The head 20 is pulled out while the cervical canal Wa is expanded. Also in this case, since the enlarged diameter portion 23 of the head 20 has a predetermined length, a portion once expanded by the tapered portion 27 of the base end portion 26 is held by the enlarged diameter portion 23. Therefore, as compared with a conventional bulge-type head, the head 20 does not move in an unstable manner and proceeds stably, so that smooth drawing is performed. Further, since the head 20 is made of metal, it is not deformed. In this respect as well, the head 20 does not move in an unstable manner and proceeds stably, so that smooth drawing is performed. For this reason, it is prevented that an unreasonable operation is performed or it takes too much time to pull out, and a situation in which the cervical mucosa is damaged is prevented.

  When embryo transfer is performed on another cow again, the livestock embryo transfer device K is thoroughly cleaned before the transfer operation and sterilized or boiled with ethylene oxide gas or autoclave, as described above. To do. In this case, since the present transplanter can be used repeatedly only by disinfection, there is no waste compared to a disposable device, and labor saving is achieved. Further, by providing the enlarged diameter portion 23, even a beginner can easily use it alone.

[Test example]
The above-described livestock embryo transfer device K according to the embodiment of the present invention was used as an example, a transfer test was performed on this example, the transfer operation time was measured, the conception rate was examined, and compared with a comparative example. The comparative example was a conventional straight type transplanter having the same outer diameter of the tube and the head.
The result about the transplant operation time is shown in FIG. According to this, in the comparative example, the processing for less than 5 minutes is about 78% of the whole, but in the example, the processing for less than 5 minutes becomes 100% of the whole, and the operation time is surely reduced. I found out.
The results of the conception rate are shown in FIG. According to this, in the comparative example, the conception rate was 51.1%, whereas in the example, it was 75%, which indicates that the conception rate was significantly improved.

In the above embodiment, the straight portion 31 is provided at the distal end portion 24 of the head 20, but the present invention is not necessarily limited to this, and the tapered portion 25 may be formed over the entire width. Note that the tip 30 of the tip 24 is preferably hemispherical.
In the above embodiment, the case of using cattle as livestock has been described. However, the present invention is not necessarily limited to this and can be applied to livestock other than cattle.

  According to the present invention, the straw S can be easily attached / detached by screwing the head 20, and if it is made of metal, the straw S is robust and does not require an outer sheath, thus reducing the cost and reducing the total number of parts. Since there are few, cleaning, disinfection, etc. become easy, and repeated use is easy. In addition, an extremely useful livestock embryo transfer device K that is excellent in operability, can be used at low cost, can be used repeatedly, and can contribute to the spread of embryo transfer technology and can greatly improve the conception rate. Can be provided.

It is sectional drawing which shows the embryo transfer device for livestock which concerns on embodiment of this invention. It is a figure which shows the structure of the head of the embryo transfer machine for livestock which concerns on embodiment of this invention. It is an exploded view which shows the embryo transfer device for livestock which concerns on embodiment of this invention. It is an assembly drawing which shows the embryo transfer machine for livestock which concerns on embodiment of this invention. It is a figure which shows the process of transplanting an embryo into the cow as a livestock using the livestock embryo transfer device which concerns on embodiment of this invention. It is a table | surface figure which shows the transplant processing time in the embryo transfer device for livestock which concerns on a test example in the Example of this invention in comparison with a comparative example. It is a table | surface which shows the fertility rate in the embryo transfer device for livestock which concerns on a test example in the Example of this invention in comparison with a comparative example. It is sectional drawing which shows an example of the conventional livestock embryo transfer device. It is a figure which shows the state which transplants an embryo into the cow as a livestock using the embryo transfer machine for livestock.

Explanation of symbols

K Livestock Embryo Transfer Device S Straw Sa Tip m Cotton Plug 1 Tube 2 Flange 10 Piston 11 Extrusion Portion 12 General Portion 13 Push Port 20 Head 21 Passage 22 Discharge Port 23 Expanded Portion 23A One End Side Expanded Portion 23B Diameter portion 24 Tip portion 25 Taper portion 25a Continuous portion 26 Base end portion 27 Tapered portion 27a Continuous portion 28 Screw means 28a Male screw 28b Female screw 29 Screw means 29a Male screw 29b Female screw 30 Point 31 Straight portion 33 Insertion hole 34 fitting part C sheath Wa cervical canal Wb uterine horn

Claims (7)

A tube in which a straw containing livestock embryos is inserted and attached, a piston that is inserted so as to be able to advance and retract from the rear end of the tube and pushes out the embryo in the attached straw when advanced to the front end side, and the tube In a livestock embryo transfer device comprising a passage through which an embryo pushed out from the straw passes and a head having a discharge port for discharging the embryo,
The head has a diameter-enlarged portion having a predetermined length larger than the tube and a tapered portion that is connected to one end of the expanded-diameter portion and gradually decreases in diameter from the connected portion toward the tip. And a base end portion having a tapered portion that is connected to the other end of the diameter-expanded portion and that gradually decreases in diameter toward the rear end side of the tube. An embryo transfer device for livestock characterized by that.   The relationship between the outer diameter Da of the tube and the outer diameter Db of the enlarged diameter portion is Da <Db, the outer diameter Db of the enlarged diameter portion is 3 mm ≦ Db ≦ 6 mm, and the predetermined length La of the enlarged diameter portion. Is set to 30 mm ≦ La ≦ 60 mm, the livestock embryo transfer device according to claim 1.   3. The livestock embryo transfer device according to claim 2, wherein the length Lb of the distal end portion is set to 8 mm ≦ Lb ≦ 16 mm, and the length Lc of the proximal end portion is set to 8 mm ≦ Lc ≦ 16 mm.   The enlarged diameter portion of the head is divided into an enlarged diameter portion on one end side and an enlarged diameter portion on the other end side, and the enlarged diameter portion on the one end side and the enlarged diameter portion on the other end side are detachably connected to each other by screw means. The livestock embryo transfer device according to claim 1, 2, or 3.   The inner diameter of the passage of the head is formed to be large enough to insert the straw, and a fitting portion is formed in the passage in the vicinity of the rear of the discharge port to fit the tip of the straw. Item 4. The livestock embryo transfer device according to Item 4.   6. The livestock embryo transfer device according to claim 4, wherein the tube, the piston and the head are made of metal, and a base end portion of the head is welded and fixed to a front end portion of the tube.   7. The livestock embryo transfer device according to claim 6, wherein the tip end portion and the enlarged diameter portion of the head are connected by screw means and integrally connected by welding.

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