NDLI: Reproductive system

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Reproductive system

Content Provider	Scilit
Copyright Year	2019
Description	Mares, like other domestic animals, have an oestrous cycle that is a coordinated series of anatomical, endocrine and behavioural changes that eventually lead to ovulation. Mares are seasonally polyoestrous breeders, meaning that they have multiple oestrous cycles during a 'breeding season'. Most mares are 'long day' or spring/summer/early autumn breeders, although about 20% of mares continue to ovulate throughout the winter months. The majority of mares enter a period when they stop cycling, known as anoestrus, during the winter months. Photoperiod or day length is the most important factor influencing this seasonality and ovarian activity, but the transition between cyclicity, non-cyclicity, and back again is gradual. The effect of the day length is mediated by the hormone melatonin, produced by the pineal gland. Short winter days lead to high melatonin secretion and suppressed gonadotropin-releasing hormone (GnRH) levels from the hypothalamus. With increased day length the periods of high melatonin production decrease, leading to increased pulses of GnRH, which stimulate follicle-stimulating hormone (FSH) and luteinising hormone (LH) production. Book Name: Equine Clinical Medicine, Surgery and Reproduction
Related Links	https://content.taylorfrancis.com/books/download?dac=C2016-0-26972-3&isbn=9780429113680&doi=10.1201/9780429113680-2&format=pdf
Ending Page	585
Page Count	179
Starting Page	407
DOI	10.1201/9780429113680-2
Language	English
Publisher	Informa UK Limited
Publisher Date	2019-11-05
Access Restriction	Open
Subject Keyword	Book Name: Equine Clinical Medicine, Surgery and Reproduction Veterinary Sciences Melatonin Winter Hormone Cyclicity Stimulating Breeders Oestrous Ovulate
Content Type	Text
Resource Type	Chapter

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