Effects of various steroid milieus or physiological states on sexual behavior of Holstein cows
Article Abstract:
The effects of steroid milieus and pregnancy on the sexual behavior of cows were investigated. One experiment induced five milieus on five ovariectomized cows: no steroid, progesterone (P4), estradiol benzoate (EB), P4 + EB, and P4 followed by EB (P4:EB). The cows were exposed to a tied or a loose estrual cow and observed for sexual behavior. A second study observed 118 intact lactating cows for mounting behavior on estrual test cows. Cows in diestrus had the lowest mounting activity, correlated with high progesterone and low estradiol. Estradiol was sufficient to stimulate sexual activity, while highest sexual activity was recorded for P4+EB and P4:EB cows.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Influence of exogenous adrenocorticotropic hormone on estrous behavior in cattle
Article Abstract:
The influence of adrenocorticotropic hormone (ACTH) on a cow's estrus cycle was evaluated by injecting the hormone to normal and ovariectomized Holstein cattle. ACTH administration delayed estrus and decreased its duration in both sets of test animals. Cows with intact ovaries were able to surmount the inhibitory influence of ACTH because they can still produce the estrogen estradiol-17-beta. The inhibitory influence of ACTH on the sexual behavior of cattle implies that stressful conditions promoting the secretion of ACTH can adversely affect production.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Rapid communication: human melanocortin receptor sequences reveal a SacI restriction fragment length polymorphism at the porcine adrenocorticotropic hormone receptor (MC2R) locus
Article Abstract:
Research was conducted to examine the adrenocorticotropic hormone receptor gene locus. Hybridization experiments were performed on human genomic clones of 1 kb and 2.9 kb to detect polymorphism. A 2-kb rat cDNA was used as a control for the neural melanocortin receptor. Results indicate that adrenocorticotropin induces steroid hormone production in the adrenal gland through specific cell surface receptors.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1999
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