Véliz Francisco G, Poindron Pascal, Malpaux Benoît, Delgadillo J Alberto
Centro de Investigación en Reproducción Caprina, Universidad Autónoma Agraria Antonio Narro, Periférico Raúl López Sánchez y Carretera a Santa Fe, CP 27054, Torreón, Coahuila, México.
Reprod Nutr Dev. 2006 Nov-Dec;46(6):657-61. doi: 10.1051/rnd:2006039. Epub 2006 Dec 15.
In the present study, we analyzed the results of two years of response to the male effect in seasonally anestrous goats to investigate whether the activation of female reproductive activity by the male effect is related to the body weight of the females. Seventy-nine adult female Mexican mixed breed goats were used. The anestrous females were exposed during 15 days to sexually active males, and were classified into three categories according to their mean body weight +/-SD (42 +/- 9 kg) (Light: < or = 33 kg, n = 19; Medium: 34-50 kg, n = 46; Heavy: > or = 51 kg, n = 14). More than 98% of the goats from the Medium and Heavy groups showed at least one estrus behavior within the first 15 days following the introduction of the bucks, versus only 63% of the females from the Light group (P < 0.01). The interval between the introduction of the males and the onset of estrus behavior was longer in the females of the Light and Medium groups (4.2 +/- 0.8 and 3.3 +/- 0.3 days) than in the females of the Heavy group (2.0 +/- 0.2 days; P < 0.03). Also, body weight was negatively correlated with latency to first estrus (Spearman r = -0.57; P < 0.001). These results are in agreement with the hypothesis that the ability of anestrous goats to respond to the male effect is positively influenced by their body weight.
在本研究中,我们分析了季节性发情山羊对雄性效应两年的反应结果,以调查雄性效应激活雌性生殖活动是否与雌性体重有关。使用了79只成年墨西哥混种雌性山羊。将处于发情间期的雌性山羊与性活跃的雄性山羊接触15天,并根据它们的平均体重±标准差(42±9千克)分为三类(轻体重组:≤33千克,n = 19;中等体重组:34 - 50千克,n = 46;重体重组:≥51千克,n = 14)。中等体重组和重体重组中超过98%的山羊在引入公羊后的前15天内至少表现出一次发情行为,而轻体重组中只有63%的雌性山羊出现这种情况(P < 0.01)。轻体重组和中等体重组雌性山羊从引入雄性到发情行为开始的间隔时间(4.2±0.8天和3.3±0.3天)比重体重组雌性山羊(2.0±0.2天)更长(P < 0.03)。此外,体重与首次发情的潜伏期呈负相关(斯皮尔曼r = -0.57;P < 0.001)。这些结果与发情间期山羊对雄性效应的反应能力受其体重正向影响这一假设一致。