To understand the ovarian basis for prolificacy of Bonga sheep, a total of 31 ewes were selected based on litter size (LS) records and divided into two groups: High Prolificacy (HP) (n  = 20) with LS ≥ 2 and Low Prolificacy (LP) (n  = 11) with LS = 1. At a synchronized estrus, follicular dynamics were determined using transrectal ultrasonography. Plasma estradiol concentrations were also monitored. In total 27 ewes were observed in estrus being 9/11 LP (82%) and 18/20 HP (90%). On the day of estrus (day 0), the mean number of large follicles was higher (p  < .05) in HP (1.78 ± 0.19) than in LP (1.0 ± 0.28) ewes. Prior to estrus, more (p  < .05) medium follicles were visible for HP compared to LP ewes. Plasma estradiol concentrations were higher in HP compared to LP ewes (18.91 ± 0.41 vs. 14.51 ± 0.65 pg/ml; p  < .05) and similarly was ovulation number (2.3 ± 0.15 vs. 1.28 ± 0. 14; p  < .05). Higher ovulation rates and litter size in Bonga sheep are evidenced by the previous presence of more large follicles and the existence of co‐dominance effects as most likely medium follicles are selected to ovulate.

中文翻译：

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大型非闭锁卵泡数量的增加和共同显性效应是邦加羊产仔数较高的原因。

为了解 Bonga 羊多产的卵巢基础，根据窝产仔数 (LS) 记录选择了总共 31 只母羊，并将其分为两组：高产 (HP)（n = 20）且 LS ≥ 2 和低产 （ LP) ( n  = 11) 和 LS = 1。在同步发情期，使用经直肠超声检查确定卵泡动力学。还监测了血浆雌二醇浓度。总共有 27 只母羊在发情期观察到 9/11 LP (82%) 和 18/20 HP (90%)。 在发情当天（第 0 天）， HP (1.78 ± 0.19) 母羊的大卵泡平均数 ( p < .05) 高于 LP (1.0 ± 0.28) 母羊。在发情前，更多 ( p < .05) 与 LP 母羊相比，HP 的中等卵泡可见。HP 母羊的血浆雌二醇浓度高于 LP 母羊（18.91 ± 0.41 vs. 14.51 ± 0.65 pg/ml；p < .05 ）  ，排卵数也类似（2.3 ± 0.15 vs. 1.28 ± 0. 14；p  < .05 ). Bonga 绵羊更高的排卵率和窝产仔数通过之前存在的更大的卵泡和存在共显性效应得到证明，因为最有可能的中等卵泡被选择排卵。