Chpt14_ANS3319BovineSyncLab_10

Chpt14_ANS3319Bovine - ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization Heat Detection in Cattle Objectives 1 To

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ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization & Heat Detection in Cattle Objectives 1) To introduce the tools needed to implement effective estrous synchronization programs. 2) To introduce the different estrous synchronization programs available to producers. 3) To review the process of heat detection in beef cattle and discuss the tools that can be used to increase it efficiency. Estrous Synchronization 1) Enhances the use of artificial insemination (AI) by increasing the number of cattle in estrus over a shorter period of time compared with unsynchronized cattle (See figure below) . 0 5 10 15 20 25 30 35 0 2 4 6 8 10 12 14 16 18 20 Unsynchronized Synchronized Day after PGF 2 treatment % exhibiting estrus 2) Allows producers to effectively manage breeding schedules to fit in with other required work. 3) Greatly reduces or eliminates labor and time required for heat detection. 4) Greatly reduces days needed to inseminate the cattle. 5) Groups cattle into calving groups resulting in: Calves are more uniform in weight and age at weaning. Concentration of labor for calving and breeding seasons. Shortens the duration of calving season and subsequent breeding season. 6) Cows that breed early in the breeding season tend to wean older, heavier calves and more uniform calves during their lifetime and also maintain a yearling calving interval.
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ANS 3319C Reproductive Physiology and Endocrinology: Estrous Synchronization & Heat Detection in Cattle 2 Estrous Synchronization Drugs 1) Prostaglandins (PGF 2 ) a) Regresses a functional corpus luteum (CL) between days 5 to 17 of the estrous cycle. b) Cattle exhibit estrus approximately 1 - 5 days after injection. c) Non-cycling cattle do not respond to PGF 2 . d) Brand names: Lutalyse and Estrumate. ( There are also several generics available) 2) Gonadotropin Releasing Hormone (GnRH) a) GnRH initiates ovulation of dominant follicles greater than 10 mm in diameter. b) There are two areas where GnRH is used in synchronization programs: When administered to cattle at random stages of the estrous cycle, GnRH initiates ovulation of dominant follicles; thereby initiating development of a new follicle. The end result is synchronization of follicle development, which improves the synchrony of the subsequent estrus upon regression of the CL. Used in conjunction with Timed-AI to synchronize ovulation and arrival of sperm to the site of fertilization in the reproductive tract. c) Brand names: Cystorelin, Fertagyl, Factrel 3) Progestogens a) Administration of progestogens to cattle prevents the expression of estrus and subsequent ovulation as long as cattle are under its influence. b) A negative effect of progestogen treatments is the development of an extremely large follicle in the absence of a functional CL, which persist on the ovary throughout the duration of a progestogen treatment. Upon removal of the progestogen, the follicle ovulates but is of compromised fertility. Long term (>10 days) treatments almost always results in decreased fertility.
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This note was uploaded on 07/16/2011 for the course ANS 3319 C taught by Professor Yelich during the Spring '11 term at University of Florida.

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Chpt14_ANS3319Bovine - ANS 3319C Reproductive Physiology and Endocrinology Estrous Synchronization Heat Detection in Cattle Objectives 1 To

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