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Old 11-10-2018, 06:17 AM
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rss Seasonality in Saint Croix male lamb reproductive development in northern Mexico.

Related Articles Seasonality in Saint Croix male lamb reproductive development in northern Mexico.

Reprod Domest Anim. 2018 Nov 09;:

Authors: Sánchez-Dávila F, Ungerfeld R, Del Bosque-González AS, Bernal-Barragán H

Abstract
The aim of this study was to determine the influence of the season of birth on the body weight, testicular size, testosterone concentrations, semen output and sexual behavior in Saint Croix male lambs. Thirty-three lambs were born in spring (n = 10), summer (n = 12), or autumn (n = 11). Body weight and the scrotal circumference were weekly recorded; semen was also weekly collected by electroejaculation, and sexual behavior toward estrous ewes was weekly evaluated. Data were recorded from 15 to 33 weeks of age. The reproductive development of Saint Croix male lambs differed according to the period in which they were born. More lambs born in spring than in summer and autumn achieved puberty during this study, and were also more precocious in semen production and displayed sexual behavior earlier. Lambs born in summer delayed their semen production, however season related negative effects were less pronounced at the end of the study than in autumn born lambs born. In conclusion, despite the apparently low seasonality of the breed, Saint Croix male lambs showed in this study a seasonal pattern in their reproductive development at least until they achieve the puberty. This article is protected by copyright. All rights reserved.


PMID: 30411411 [PubMed - as supplied by publisher]



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