Fifteen minutes of daily contact with sexually active male induces ovulation but delays its timing in seasonally anestrous goats.pdfVIP

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Fifteen minutes of daily contact with sexually active male induces ovulation but delays its timing in seasonally anestrous goats.pdf

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Fifteen minutes of daily contact with sexually active male induces ovulation but delays its timing in seasonally anestrous goats.pdf

Theriogenology 87 (2017) 148–153 Contents lists available at ScienceDirect Theriogenology journal homepage: Fifteen minutes of daily contact with sexually active male induces ovulation but delays its timing in seasonally anestrous goats S. Ramírez a, M. Bedos b, M. Chasles c, H. Hernández a, J.A. Flores a, J. Vielma a, G. Duarte a, M.S. Retana-Márquez d, M. Keller c, P. Chemineau c, J.A. Delgadillo a,* a Centro de Investigación en Reproducción Caprina (CIRCA), Programa de Posgrado en Ciencias Agrarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico b Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico c Physiologie de la Reproduction et des Comportements, INRA, CNRS, Université de Tours, IFCE, Agreenium, Nouzilly, France d Departamento Biología de la Reproducción, Universidad Autónoma Metropolitana Iztapalapa, Ciudad de México, Mexico article info Article history: Received 26 May 2016 Received in revised form 8 August 2016 Accepted 9 August 2016 Keywords: Caprine Male effect Duration of contact Photoperiod Sexual behavior abstract The present experiment was conducted to determine (1) whether the sexually active bucks are able to stimulate the ovulatory activity of seasonal anestrous goats when the daily contact is reduced to 15 min/day during 15 days and (2) the exact ovulatory activity in anestrous goats exposed to bucks for 2 hours or less per day during 15 days. One group of goats (n ? 15) was isolated from bucks. The other six groups (n ? 15 each) were exposed to sexually active bucks (n ? 1 each) for 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, or 24 hours during 15 days. Goats with plasma concentrations of progesterone greater than 0.5 ng/mL were considered to have ovulated. More than 93% of females exposed to bucks ovulated throughout the experiment regardless of the duration of contact with males, whereas none of them ovulated in the isolated group (P 0.0001). The proportions of fem