JPS622783B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to feed additives and compound feeds that have an eggshell strengthening effect. Conventionally, calcium is added to feed for laying hens to strengthen egg shells. Limestone, persimmon shell (oyster shell), etc. are known to contain a large amount of calcium, and these materials are added to feed. However, although the addition of the above-mentioned substances helps to strengthen the eggshells to some extent, when added in sufficient amounts to be effective, the unabsorbed portion of the substances has a negative effect on the animal body, causing a decrease in egg-laying rate. It was hot. The present inventors conducted research on an eggshell strengthening agent that has an eggshell strengthening effect and does not cause disadvantages such as a decrease in egg production rate. I found that the purpose could be achieved. When using limestone as a calcium source to strengthen eggshells, coarser granular limestone is said to be more effective than powdered limestone. However, in the case of the persimmon shell of the present invention, the persimmon shell, which is usually coarsely divided and used in the form of a compressed form, is ground into a finer powder with a particle size of 4 mm or less, preferably about 2 mm. The particle size of 4 mm or less here refers to the size of crushed persimmon shell that passes through a square sieve with sides of 4 mm, that is, a sieve with 4 mm openings. Therefore, in order to obtain oyster shells having such a particle size, it is sufficient to sieve them using a sieve having a mesh size of 4 mm, for example. The eggshell-strengthening effect of amino acids is thought to be in strengthening the eggshell membrane and making the thickness of the eggshell uniform. Amino acids having these effects include methionine, lysine, and glycine, and one or more selected from these may be used. The blending amount is 1 part per 100 parts by weight of oyster shell.
~15 parts by weight is good. Among the three types of amino acids, methionine has particularly excellent effects. In the case of a combination, a preferred blending amount is a combination of 0.5 to 10 parts by weight of methionine and 0.5 to 5 parts by weight of lysine per 100 parts by weight of persimmon shell. When magnesium phosphate is added to the eggshell strengthening agent of the present invention in addition to the above-mentioned substances, the action of the above-mentioned substances can be further strengthened. This magnesium phosphate increases the absorption of calcium by the oyster shell, and as a result, the added calcium is sufficiently absorbed into the animal's body, and the remaining calcium does not cause a decrease in egg production rate. When this material is blended, it is preferably used in a proportion of 1 to 2 parts by weight per 100 parts by weight of persimmon shellfish. In addition to these substances, vitamins, base materials, etc. may be added. It is preferable to use vitamin D as a vitamin supplement because it promotes absorption of calcium, and vitamin A relieves stress caused by heat and close breeding. Furthermore, when alpha alpha is used as the base material, the egg yolk is improved. The eggshell strengthening agent of the present invention is produced by mixing the above-mentioned substances, but when mixing, feed oil such as tallow or yellow grease is added to powdered oyster shell and then mixed with other raw materials. This is preferable because the powdered persimmon shell does not scatter. Furthermore, when the total amount of persimmon shell powder and amino acids, which are the eggshell strengthening ingredients of the present invention, is added at a ratio of 1 to 2 parts by weight per 100 parts by weight of the compound feed for laying hens, a compound feed having an eggshell strengthening effect can be obtained. It will be done. There is no particular difference in using a larger amount. Eggs obtained by feeding this feed have a strengthened egg shell, so the egg breakage rate is low, and even old chickens can produce eggs with sufficient commercial value. In addition, the feed of the present invention also has the effect of alleviating stress caused by heat and stress caused by close feeding, so that an increase in egg laying rate and a decrease in mortality rate are observed, thereby increasing productivity. Next, a comparative experiment will be shown to demonstrate the effects of the present invention. Add the additives listed in Table 1 (indicated parts by weight) to a poultry compound feed (100 parts by weight) having the following composition: grains (corn, milo), 62 parts by weight, soybean oil meal, 19 fishmeal, 6 bran, 1 minerals, vitamins, and other 12 total 100 parts. A variety of mixed feeds were produced by adding . The comparative example is calcium carbonate 7.37%
This is similar to currently available commercial poultry compound feed. Further, the amounts added in Table 1 are expressed as weight % of the amount added to the compounded feed.

[Table] Each of the obtained mixed feeds was fed to 15 single-crowned white leghorns per group, 452 days old (old chickens), for 8 weeks.
Table 2 shows the eggshell strength, eggshell thickness, spawning rate, and mortality rate at that time. The eggshell strength and eggshell thickness were measured as follows. Eggshell Strength Place an egg horizontally on the sample stage of a rheometer (manufactured by Fudo Kogyo Co., Ltd.) and set it so that the center of the attachment is on the equator of the egg. Next, the sample table is moved at a speed of 20 cm/min to apply pressure to the egg, and the pressure before the egg breaks is shown. Thickness of eggshell After collecting a small piece of the equatorial part of the eggshell and peeling off the eggshell membrane, a digital dial gauge (Ono Sokki Co., Ltd.) was used.
An egg shell was placed in the attachment F of a product manufactured by A. Co., Ltd.), and the thickness of the egg shell was measured.

【table】

[Table] 〓Note〓
Number of dead birds during the period = 100
* Mortality rate =

Claims (1)

[Scope of Claims] 1. An eggshell strengthening agent comprising a combination of 100 parts by weight of powdered persimmon shell having a particle size of 4 mm or less and 1 to 15 parts by weight of at least one amino acid selected from methionine, lysine and glycine. 2 Contains an eggshell strengthening ingredient in an amount of 1% or more, which is a combination of 100 parts by weight of powdered oyster shells with a particle size of 4 mm or less and 1 to 15 parts by weight of at least one amino acid selected from methionine, lysine, and glycine. Compound feed for laying hens.