Spring rebreeding activity was investigated in 44 multiparous Awassi ewes allocated to one of three treatments. The first treatment entailed ewes suckling lambs for 45 days and then continuously exposed to fertile rams (Group 1); ewes of the second group were weaned at 14 days of age and then were either exposed continuously (Group 2) or intermittently (Group 3) to rams. Time of weaning and type of exposure to the ram did not influence the reproductive performance in terms of fertility and prolificacy in postpartum Awassi ewes. Time of weaning did not influence serum LH concentrations monitored at 3h intervals in Groups 1 and 2. However, serum prolactin (PRL) concentrations were significantly higher in Group 1, compared to Group 2 of ewes. Serum LH levels at weaning were significantly higher in ewes that conceived and lambed, compared to ewes that did not. It was concluded that spring rebreeding of postpartum Awassi ewes did not respond to ram presence and/or early weaning in terms of improved reproductive performance. The lack of reproductive response was further reflected in LH and PRL profiles.

中文翻译：

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断奶和公羊对产后阿瓦西母羊春季再繁殖生育力、血清促黄体激素和催乳素水平的影响

在分配给三种处理之一的 44 只经产的 Awassi 母羊中研究了春季再繁殖活动。第一次处理需要母羊哺乳羔羊 45 天，然后持续暴露于可育的公羊（第 1 组）；第二组的母羊在 14 日龄断奶，然后连续（第 2 组）或间歇（第 3 组）接触公羊。断奶时间和暴露于公羊的类型不影响产后 Awassi 母羊的生育能力和多产能力。断奶时间不影响第 1 组和第 2 组中每隔 3 小时监测的血清 LH 浓度。然而，与第 2 组母羊相比，第 1 组的血清催乳素 (PRL) 浓度显着更高。受孕和产羔的母羊断奶时的血清 LH 水平显着更高，与没有的母羊相比。得出的结论是，产后 Awassi 母羊的春季再繁殖对公羊的存在和/或早期断奶在提高繁殖性能方面没有反应。LH 和 PRL 谱进一步反映了生殖反应的缺乏。