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High ambient temperature impacts semen quality in boars and potential molecular drug-targets and nutritional strategies for amelioration

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  10th International Livestock Environment Symposium (ILES X)  .(doi:10.13031/iles.18-077)
Authors:   Yansen Li, Zhaojian Li, Jiaqin Chen, Chunmei Li
Keywords:   Boar; Heat stress; L-arginine; Nrf2; Semen quality

Abstract. In boars, semen quality decrease in hot summer due to disruption of spermatogenesis induced by increased testicular temperature. Many effects of elevated temperature on spermatogenesis involve testicular sensitivity to higher temperature, nutritional deficiency, production of reactive oxygen species (ROS), abnormal testosterone secretion rhythm, and nitric oxides signals. Meanwhile, potential abilities of anti-heat stress in testis are activated to attenuate adverse effects of high temperature-induced heat stress on semen quality. These include intercellular anti-oxidative system, testosterone-synthesis, and libido-synthesis. In addition, many dietary additives can be effectively applied to eliminate ROS, maintain testosterone secretion, promote libido synthesis, and enhance the process of spermatogenesis. This paper reviewed the thermoregulatory system in the testis and the mechanism underlying heat-induced poor semen quality, and suggested some potential molecular drug-targets and nutritional strategies for ameliorating heat stress-induced poor semen quality in boars based on our recent publications.

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