Abstract
The disparity that exists between the physiological breeding season of the mare and the arbitrary mating period imposed upon Thoroughbred horses causes special problems in the control of anoestrus in Thoroughbred stud management. Seasonal anoestrus can now be successfully curtailed by combined therapy with artificial lighting, orally-active progestagens and prostaglandin analogues. Recent experiments indicate that low dose, slow release implants of GnRH analogues may also play a useful role in the future. Lactation anoestrus occurs mainly in mares which foal early in the year and this condition also responds well to treatment with oral progestagens. Persistence of the endometrial cup reaction following spontaneous or deliberate loss of a pregnancy after Day 40 gives rise to a unique type of gonadotrophin-induced anoestrus in the mare. This phenomenon is specially related to twinning in Thoroughbreds and is best managed by the use of ultrasound scanning for early, accurate diagnosis of pregnancy.
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References
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© 1985 ECSC, EEC, EAEC, Brussels-Luxembourg
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Allen, W.R. (1985). Practical Control of Anoestrus in Thoroughbred Broodmares. In: Ellendorff, F., Elsaesser, F. (eds) Endocrine Causes of Seasonal and Lactational Anestrus in Farm Animals. Current Topics in Veterinary Medicine and Animal Science, vol 31. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5026-9_12
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DOI: https://doi.org/10.1007/978-94-009-5026-9_12
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