The influence of stress factors on the reproductive function of mares
Abstract
The article summarizes the current data on the influence of various stress factors on the reproductive qualities of mares presented in the literature. The hormones of the hypothalamic-pituitary-gonadal, thyroid and somatotropic systems along with the sympathoadrenal and hypothalamic-pituitary-adrenal element of the endocrine regulation play an important role in adapting to various stressful environmental conditions during the realization of the reproductive function of mares, direction of their using, health status, quality of feeding. In most cases, catecholamines are formed under short-term stress - the sympathoadrenal system is activated. Elevated glucocorticoid levels are observed with prolonged stress exposure. Among them, cortisol plays a leading role in the horse's body. The overall effect of stress hormones (catecholamines and glucocorticoids) on the reproductive qualities of mares is a violation of the secretion and sensitivity to gonadotropic and steroid hormones, changes in the regulation of physiological processes that are fundamental to steroidogenesis, development and growth of follicles and ovulation. Considered several physiological mechanisms leading to a similar result. Attention is focused on the need to study the relatively recently discovered substances - kisspeptin and gonadotropin-inhibiting hormone. Updated the need to develop and using tests for the evaluation and selection of horses for stress resistance. The review is divided into three components: 1 - short description of the effect of the activation of the sympathoadrenal and hypothalamic-pituitary-adrenocortical systems; 2 - the direct and indirect effect of stress hormones on the hypothalamic-pituitary-gonadal system; 3 - thyroid and somatotropic components of stress induction. Biochemical aspects are partly affected, because of the vastness of the issue under study.
About the Author
G. .. Shiryaev
Russian Research Institute of Farm Animal Genetics and Breeding - Branch of the L.K. Ernst Federal Science Center for Animal Husbandry
Russian Federation
Russian Federation
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For citations:
Shiryaev G... The influence of stress factors on the reproductive function of mares. Genetics and breeding of animals. 2018;(4):67-76. (In Russ.)
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