There are environmental factors that can affect male performance and fertility. There have been instances in which males suddenly became sterile after years of good performance. In all of the instances known to the author, Possible causes for abrupt changes in performance include severe and prolonged heat, injury to the testicles, or penis sheath/penis damage caused by fighting. Bouts with disease or other injuries may also be the cause of the problem. Unusually hot weather leading to heat stress can render a male infertile for 60 to 90 days. Spring shearing and implementation of other cooling measures can reduce the possibility of lost performance caused by heat stress.
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