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August 1995 in “The journal of experimental zoology/Journal of experimental zoology” Melatonin treatment made ferrets grow their fur earlier and affected their breeding time.
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October 2013 in “Gynecologic and Obstetric Investigation” Severe iron deficiency lowers fertility in female rats.
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February 1977 in “PubMed” Increasing light exposure in winter can make mares ovulate and cycle earlier.
June 2014 in “Basic & Clinical Pharmacology & Toxicology” Some plant extracts may treat livestock diseases, certain animal treatments are safe and effective, but more research on drug safety and resistance is needed.