PMID: 6411581Jun 1, 1983Paper

The reproductive--endocrine response of adult rams to sexual encounters with estrual ewes is season dependent

Hormones and Behavior
T A Yarney, L M Sanford

Abstract

An experiment was conducted with four adult, sexually inexperienced Finnish Landrace rams during the ovine nonbreeding (July) and breeding (October) seasons to determine the influence of components of the rams' mating behavior on the secretion of luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL), and testosterone. On four occasions in both seasons, blood was collected by jugular venipuncture at 20-min intervals during an 8-hr period while rams were (1) separated from, (2) observing with minimal direct physical contact, (3) mounting without intromission, or (4) mating estrous-induced ewes. In comparison with separation periods, mating activity in July was associated with increased mean LH (P less than 0.05) and testosterone levels and number of LH peaks, while in October, obvious increases were detected in only baseline LH levels (P less than 0.05). Circulating LH and testosterone levels either did not change (July) or were depressed (October) during the mounting and observation periods. FSH levels generally remained unaffected by engagement in the various sexual activities. Although a clear relationship between type of sexual activity and mean PRL levels was not observed in July, activities which app...Continue Reading

References

Sep 1, 1976·Journal of Reproduction and Fertility·A W IlliusG E Lamming
Oct 11, 1975·The Veterinary Record·A W IlliusG E Lamming
Jan 1, 1974·The Journal of Endocrinology·C B KatongoleR V Short
May 1, 1974·The Journal of Endocrinology·K PurvisN B Haynes
Aug 1, 1974·Endocrinology·L M SanfordB E Howland
Aug 1, 1971·The Journal of Clinical Endocrinology and Metabolism·D RodbardH S Jacobs
May 1, 1969·Endocrinology·G D NiswenderA V Nalbandov
Jan 1, 1981·Journal of Reproduction and Fertility·K W ChengW M Palmer
Mar 1, 1981·Journal of Reproduction and Fertility·J L DacheuxM Courot

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Citations

Aug 1, 1985·Theriogenology·D GunarajasingamP C Laguë
Oct 13, 2011·Reproduction in Domestic Animals = Zuchthygiene·R Ungerfeld, D Fila

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