Alavez-Ramírez Alejandro, Montes-Pérez Rubén, Aguilar-Caballero Armando Jacinto, Ortega-Pacheco Antonio
Facultad de Medicina Veterinaria y Zootecnia, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Km 15.5, Carretera Mérida-Xmatkuil, Apartado postal 4-116, 97100, Mérida, Yucatán, Mexico.
Trop Anim Health Prod. 2016 Mar;48(3):655-8. doi: 10.1007/s11250-015-0977-2. Epub 2015 Dec 23.
The aim of this study was to evaluate the "male effect" at the end of protocol with prostaglandins (PG) on estrus synchronization of hair sheep during breeding season (November-December) in Yucatan, Mexico. Twenty female Pelibuey sheep (weighting 38.2 ± 1.6 kg and body condition score of 2.5 ± 0.5) were randomly distributed in two groups (n = 10). Group T1 (control, PG), two doses of 50 μg of cloprostenol with 12 days between applications were applied; in the second group T2 (PG-ME), ewes received the same PG protocol plus the introduction of a male at the end of treatment. The interval of end treatment-onset of estrus was analyzed using survival test; the number of sheep with presence/absence of estrus was analyzed using Fisher's exact test. Ewes in estrus for groups T1 and T2 were 5 vs. 8, respectively. No significant differences were found as regards the interval end of treatment-onset of estrus (P > 0.05), as well as in total proportion of ewes with estrus and likewise in the duration of it (P > 0.05). We conclude that the protocol based on double dose of PGF2α with interval of 12 days combined with the male effect is efficient to induce luteolysis and estrus synchronization in hair sheep.
本研究的目的是评估在墨西哥尤卡坦州繁殖季节（11月至12月）使用前列腺素（PG）进行同期发情处理结束时的“雄性效应”。将20只佩利布埃羊母羊（体重38.2±1.6千克，体况评分为2.5±0.5）随机分为两组（n = 10）。T1组（对照，PG），应用两剂50μg氯前列醇，给药间隔为12天；在第二组T2（PG - ME）中，母羊接受相同的PG处理方案，并在处理结束时引入一只公羊。使用生存试验分析处理结束至发情开始的间隔；使用Fisher精确检验分析发情母羊的数量。T1组和T2组发情的母羊分别为5只和8只。在处理结束至发情开始的间隔方面（P>0.05），以及发情母羊的总比例和发情持续时间方面（P>0.05）均未发现显著差异。我们得出结论，基于间隔12天的双剂量PGF2α并结合雄性效应的处理方案，在诱导毛用绵羊黄体溶解和同期发情方面是有效的。
