Sexually active bucks are able to stimulate three successive groups of females per day with a 4-hour period of contact

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• 作者：M. Bedos^a ; H. Velá ; zquez^a ; G. Fitz-Rodrí ; guez^a ; J.A. Flores^a ; H. Herná ; ndez^a ; G. Duarte^a ; J. Vielma^a ; I.G. Ferná ; ndez^a ; M.S. Retana-Má ; rquez^b ; M. Mu&#241 ; oz-Gutié ; rrez^b ; M. Keller^c ; J.A. Delgadillo^a ; ^{joaldesa@yahoo.com}
• 关键词：Male effect ; Anovulatory does ; Duration of contact ; Male&ndash ; female ratio ; Ovulation
• 刊名：Physiology and Behavior
• 出版年：2012
• 期刊代码：220_00319384
• 类别：med
• 出版时间：15 May, 2012
• 卷：106
• 期：2
• 页码：259-263
• 文件大小：329 K

摘要

Bucks rendered sexually active by a photoperiod treatment of long days can induce fertile ovulation in a group of goats with only 4 h of contact daily with a male:female ratio of 1:10. Here we tested whether such bucks could induce fertile ovulations when stimulating successively three different groups of anovulatory goats when interacting 4 h per day during 15 consecutive days. Control males (n = 3) were introduced in the control group (n = 25) of does at 8:00 h and were removed at 12:00 h. Experimental males (n = 3) were in contact with the experimental groups of does: from 8:00 h to 12:00 h with a first group (n = 27), from 12:00 h to 16:00 h with a second group (n = 26) and with a third one (n = 27) from 16:00 h to 20:00 h. Bucks were then placed until next day in another pen. Both in the control and the experimental groups, more than 85%of females ovulated, and the proportions did not differ between the control and experimental groups (P 鈮?#xA0;0.67) or between the three experimental groups (P 鈮?#xA0;0.67). Moreover, the ovulation rate did not differ significantly between the control and the experimental females nor between the three experimental groups. Bucks were able to fertilize more than 72%of does independently of the number of females they were exposed to (P 鈮?#xA0;0.17). Finally, more than 58%of females kidded and fertility did not differ between the control and experimental groups (P = 1) nor among experimental groups (P 鈮?#xA0;0.77). We conclude that sexually active bucks are able to induce fertile ovulation in three successive groups of anovulatory goats even when the period of contact between sexes is reduced to 4 h per day.