Estrus Synchronization Protocols

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In the current breeding practices, management of the estrous cycle is a common. Breeders want to know when their mare is in one phase or the other and also wants to be able to determine when she will ovulate. Manipulation of the estrous cycle is a practice of breeding management. Manipulation of estrous involves changing the normal cycle through hormone treatments or other methods. Managing and manipulating the estrous cycle allows breeders to have control over the phase the mare is experiencing and the length of time she will be in that phase. Estrus synchronization is the practice of regulating when one or many mares will be in estrus. Breeders can follow certain protocol in order to cause synchronization in the cycle. According to Samper (2009), there are three methods of inducing estrus. These are induction of luteolysis, prevention of estrus using progestins and progesterone with estradiol which allow natural luteolysis to occur and are almost always combined with a treatment for ovulation induction, and follicular ablation. This paper with examine and explore the hormones, methods, doses and protocols used to synchronize estrus in the mare. There are many reasons why breeders may want to synchronize the estrus cycle in a mare. When using cooled or frozen semen for an artificial insemination, synchronization of the estrus cycle can greatly increase the effectiveness of the breeding(s). There is a limited amount of time in which the mare is able to get pregnant, by synchronizing her estrus cycle, her chances of ovulating during that small window of time is greatly increased. Estrus synchronization allows breeders to coordinate several different mares’ ovulations in order to prepare them for embryo or oocyte tr... ... middle of paper ... ...ryland Heights, MO: Mosby, Inc. French, A. C., Thompson, A. L., Davis, B. G. (2009) High-purity discrete PEG-oligomer crystals allow insight. Angew. Chem. International Edition, Vol 48, Issue 7, page 1248. Retrieved 04/04/14 from http://users.ox.ac.uk/~dplb0149/publication/pub108.pdf. McKinnon, A. O., Voss, J. L. (2005). Equine reproduction. Ames, IA: Blackwell Publishing Samper, J. C. (2000). Equine breeding management and artificial insemination. Philadelphia, PA: W.B. Saunders Company Samper, J. C. (2009). Equine breeding management and artificial insemination (2nd ed.). St. Louis, MO: Elsevier Health Sciences Squires, E. L. PhD (2008). Hormonal Manipulation of the Mare: A Review. Journal of Equine Veterinary Science, Vol 28, No 11, pages 627-634. Retrieved 02/20/14 from http://wb.fvet.uba.ar/equinos/8313/review.PDF .fvet.uba.ar/equinos/8313/review.PDF

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