Continuous exposure to sexually active rams extends estrous activity in ewes in spring

Theriogenology
J A AbeciaJ A Delgadillo

Abstract

Sexual activity in sheep is under photoperiodic control, which is the main environmental factor responsible for the seasonality of reproduction. However, other natural environmental factors such as presence of conspecifics can slightly influence the timing of onset and offset of the breeding season. In goats, we have found that the continuous presence of bucks that were rendered sexually active out of season by previous exposure to long days, prevented goats from displaying seasonal anestrus, which suggests that the relative contribution of photoperiod in controlling seasonal anestrus should be reevaluated in small ruminant species. The aim of this study was to assess whether the presence of sexually active rams that had been stimulated by artificial photoperiod and melatonin implants, reduces seasonal anestrus in sheep, by prolonging ovulatory activity in spring. Ewes were assigned to one of two groups (n = 16 and 15), which were housed in two separate barns, and kept in contact, either with the treated or the control rams between March and July. Vasectomized rams were either exposed to 2 months of long days followed by the insertion of three subcutaneous melatonin implants (treated rams, n = 8), or exposed to natural light co...Continue Reading

References

Aug 1, 1973·The Journal of Endocrinology·K P McNattyA Young
Oct 29, 2008·Reproduction in Domestic Animals = Zuchthygiene·A CasaoT Muiño-Blanco
Oct 17, 2009·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·F H Bronson
Nov 5, 2011·Biology of Reproduction·Jean-Baptiste MenassolRex J Scaramuzzi
Jul 5, 2013·Proceedings. Biological Sciences·Barbara HelmDavide Dominoni
Dec 17, 2014·Hormones and Behavior·J A DelgadilloP Chemineau

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Citations

May 14, 2016·Theriogenology·Hugues DardenteMaria-Teresa Pellicer-Rubio
Jul 24, 2021·Animal : an International Journal of Animal Bioscience·J SimõesP Chemineau

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