Seventy years of progestagen treatments for management of the sheep oestrous cycle: Where we are and where we should go

Antonio Gonzalez-Bulnes, Alejo Menchaca, Graeme B. Martin, Paula Martinez-Ros

Research output: Contribution to journalReview article

16 Citations (Scopus)

Abstract

Management of the ovine oestrous cycle is mainly based on the use of exogenous hormones to mimic or enhance (progesterone and its analogues) or manipulate (prostaglandin F and its analogues) the activity of the corpus luteum, combined with the application of other hormones mimicking the pituitary secretion of gonadotrophins (e.g. equine chorionic gonadotrophin). These protocols have been applied without major change for decades but, now, there are two reasons to reconsider them: (1) our greatly improved knowledge of the dynamics of ovarian physiology, following the application of transrectal ultrasonography, indicates that modification of the protocols may improve fertility yields and (2) increasing concerns about animal health and welfare, food safety and the environmental impact of the treatments, as evidenced by public opinion and therefore market forces. Here, we offer an overview of these issues, introduce an updated protocol and suggest ways for future improvements to the protocols.

Original languageEnglish
Pages (from-to)441-452
Number of pages12
JournalReproduction, Fertility and Development
Volume32
Issue number5
DOIs
Publication statusPublished - Mar 2020

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