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Overview of Hormonal Control of Estrus


Juan E. Romano

, DVM, MS, PhD, DACT, Texas A&M University

Last full review/revision Apr 2021 | Content last modified Apr 2021

Hormones are commonly used to manipulate the estrous cycle. The major indications for hormonal control of estrus are to induce luteolysis, induce ovulation of a mature follicle, suppress estrus, induce cyclicity in anestrous animals, and superovulate cyclic animals. Effective treatments for these manipulations of the estrous cycle vary between species. Additionally, a number of treatments currently lack regulatory approval; prescribing veterinarians should follow label instructions and adhere to relevant laws and regulations.

Hormonal control of estrus in horses, ruminants, and small animals is discussed in this section. For pigs, refer to Breeding Management in Pigs.

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Management of the Neonate
Large animal neonates are born immunocompetent but lack antibodies. In their first few hours of life, neonates must suckle good quality colostrum from the dam to obtain maternal antibodies (immunoglobulins). Which of the following factors might compromise the quality of colostrum?
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