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ASAS Centennial Paper: Contributions in the Journal of Animal Science to the development of protocols for breeding management of cattle through synchronization of estrus and ovulation

Lauderdale Enterprises, Inc. Augusta, MI 49012

lauderents{at}aol.com

Abstract

ASAS Members, publishing in Journal of Animal Science (JAS), completed research that resulted in understanding the estrous cycle of cattle, which led to the ability to inseminate cattle on a given day with pregnancy rates similar to those achieved by 21 d breeding by a fertile and sound bull. Research published in JAS led to understanding estrus, ovulation, the estrous cycle, and postpartum interval for cattle (1930s through 1960s) and hormonal factors affecting corpus luteum lifespan of cattle (1950s through 1980s). Research during the 1940s to 1960s, using gonadotropins and progesterone to manage the estrous cycle of cattle, established the concepts for estrus synchronization and stimulated commercial research directed at developing cost-effective progestogen estrus synchronization products, leading to commercially available products from 1967 through today (Repromix, MGA, Syncro-Mate-B, CIDR). Prostaglandin F₂ (PGF₂) products were approved for estrus synchronization (1970s, 1980s) and GnRH products were approved for use in cattle to treat ovarian follicular cysts (1970s, 1980s). Research published in JAS was essential for understanding the biology of and potential value of both PGF₂ and GnRH and contributed both to new knowledge and scientific bases for future Food and Drug Administration Center for Veterinary Medicine approval of those products. Research during the1980s through 2000s led to understanding ovarian follicular waves and described the timing of follicular recruitment, selection, dominance and atresia; this research was essential for the ability to effectively manage follicles to achieve success with timed AI (TAI). The knowledge gained through research published in JAS resulted in development of the numerous estrus synchronization and breeding management protocols that are cost-effective and meet the breeding management "needs" of most beef and dairy enterprises.

Key Words: cattle • estrus synchronization • AI • timed AI • history