... Rebecca C. Bott MS, PhD a , Corresponding Author Contact Information , E-mail The Correspondi... more ... Rebecca C. Bott MS, PhD a , Corresponding Author Contact Information , E-mail The Corresponding Author , Shevin M. Schwartzenberger BS a , Jason E. Bruemmer MS, PhD a , b , J. Alejandro Arreguin-Arevalo DVM, MS, PhD a and Gordon D. Niswender MS, PhD a. ...
Abstract. Manure management is a major component of horse and livestock production. However, know... more Abstract. Manure management is a major component of horse and livestock production. However, knowledge of a practice and confidence in performing a practice are not necessarily synonymous. Faculty from South Dakota State University’s (SDSU) Animal Science and Agricultural and Biosystems Engineering partnered to develop an experiential learning opportunity for students to learn about manure management and composting. The activity was conducted in an equine stable management (1 cohort of students) and an agricultural waste management course (2 cohorts of students). The activity objectives were: 1) gain experience designing and constructing a compost pile, 2) critically evaluate compost progress and make appropriate management decisions, 3) maintain a logbook of management decisions and behaviors, and 4) develop an understanding of opportunities and challenges associated with manure management. Following compost pile construction, students assumed responsibility for monitoring and maintenance of the compost piles for a two month period. The perceptions and knowledge of composting for one cohort of each course were compared before and after the activity and between courses. Students from both classes who participated in compost management reported an increased confidence in knowledge and ability to compost. The perceptions of the students on the importance of manure management differed between courses over time, likely as a result of the overall course content differences. The variations in activity implementation for the three cohorts are also discussed.
This review examines the function of the corpus luteum (CL) with emphasis on pregnancy in ruminan... more This review examines the function of the corpus luteum (CL) with emphasis on pregnancy in ruminant models and the possible impact of pregnancy in conferring luteal resistance to prostaglandin F2α (PGF2α). Critical processes involved with formation of the CL impact the capacity to secrete progesterone. Similarly, complete luteolysis is critically important in the event that pregnancy does not occur so that a new ovulation and opportunity for pregnancy is established. It is well known that serum progesterone must reach a critical nadir if ovulation and fertilization are to occur. Following fertilization, the function of the CL in providing adequate progesterone is critical in setting up an endometrial environment so that pregnancy is maintained. Benefits of supplemental progesterone during early pregnancy are inconsistent in ruminants. However, recent studies indicate that supplemental progesterone following artificial insemination (AI) may depend on the presence of the CL and the amount of progesterone released from the CL. The primary signal for maternal recognition of pregnancy, interferon-tau (IFNT), is secreted from the ruminant conceptus (embryo proper and extraembryonic membranes). IFNT disrupts release of PGF2α from the endometrium and is antiluteolytic through inhibiting uterine expression of the estradiol receptor (ESR1) or the oxytocin receptor (OXTR). Endocrine action of IFNT on peripheral blood mononuclear cells and on the CL may also contribute to immunomodulatory function and longer-term sustainability and function of the CL as pregnancy progresses.
... Rebecca C. Bott MS, PhD a , Corresponding Author Contact Information , E-mail The Correspondi... more ... Rebecca C. Bott MS, PhD a , Corresponding Author Contact Information , E-mail The Corresponding Author , Shevin M. Schwartzenberger BS a , Jason E. Bruemmer MS, PhD a , b , J. Alejandro Arreguin-Arevalo DVM, MS, PhD a and Gordon D. Niswender MS, PhD a. ...
Abstract. Manure management is a major component of horse and livestock production. However, know... more Abstract. Manure management is a major component of horse and livestock production. However, knowledge of a practice and confidence in performing a practice are not necessarily synonymous. Faculty from South Dakota State University’s (SDSU) Animal Science and Agricultural and Biosystems Engineering partnered to develop an experiential learning opportunity for students to learn about manure management and composting. The activity was conducted in an equine stable management (1 cohort of students) and an agricultural waste management course (2 cohorts of students). The activity objectives were: 1) gain experience designing and constructing a compost pile, 2) critically evaluate compost progress and make appropriate management decisions, 3) maintain a logbook of management decisions and behaviors, and 4) develop an understanding of opportunities and challenges associated with manure management. Following compost pile construction, students assumed responsibility for monitoring and maintenance of the compost piles for a two month period. The perceptions and knowledge of composting for one cohort of each course were compared before and after the activity and between courses. Students from both classes who participated in compost management reported an increased confidence in knowledge and ability to compost. The perceptions of the students on the importance of manure management differed between courses over time, likely as a result of the overall course content differences. The variations in activity implementation for the three cohorts are also discussed.
This review examines the function of the corpus luteum (CL) with emphasis on pregnancy in ruminan... more This review examines the function of the corpus luteum (CL) with emphasis on pregnancy in ruminant models and the possible impact of pregnancy in conferring luteal resistance to prostaglandin F2α (PGF2α). Critical processes involved with formation of the CL impact the capacity to secrete progesterone. Similarly, complete luteolysis is critically important in the event that pregnancy does not occur so that a new ovulation and opportunity for pregnancy is established. It is well known that serum progesterone must reach a critical nadir if ovulation and fertilization are to occur. Following fertilization, the function of the CL in providing adequate progesterone is critical in setting up an endometrial environment so that pregnancy is maintained. Benefits of supplemental progesterone during early pregnancy are inconsistent in ruminants. However, recent studies indicate that supplemental progesterone following artificial insemination (AI) may depend on the presence of the CL and the amount of progesterone released from the CL. The primary signal for maternal recognition of pregnancy, interferon-tau (IFNT), is secreted from the ruminant conceptus (embryo proper and extraembryonic membranes). IFNT disrupts release of PGF2α from the endometrium and is antiluteolytic through inhibiting uterine expression of the estradiol receptor (ESR1) or the oxytocin receptor (OXTR). Endocrine action of IFNT on peripheral blood mononuclear cells and on the CL may also contribute to immunomodulatory function and longer-term sustainability and function of the CL as pregnancy progresses.
Uploads
Papers