Abstract This study determined to what extent the duration of labour phase II under extensive rearing would affect lamb viability and maternal behaviour in primiparous (P) single-bearing Corriedale ewes (n = 63). Multiparous (M) ewes (n = 116) were used as control category, reared under the same conditions. Duration of labour was divided in 4 time-groups, G1: ≤ 30 min; G2: 31- 60 min; G3: 61 - 90 min and G4: ≥ 90 min for each ewe category. Body condition score (BCS, scale 0-5), duration of labour, delivery assistance, maternal behaviour score (MBS, 1-5) and presence of grooming after parturition were recorded and length of gestation calculated. Lambs were Apgar tested (score 1-10) at birth; time elapsed to stand and successful suckling during the first two hours of birth was recorded as well as birthweight (BW) and mortality during their first 72 h. Prepartum BCS was similar between categories, while P ewes showed shorter gestation (147.2 ± 0.3 vs. 148.0 ± 0.2 days, P = 0.0474), longer expulsion phase (50.5 ± 4.2 vs. 32.2 ± 2.6 min, P

中文翻译：

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在粗放饲养条件下，第二阶段分娩的持续时间对羊毛型初产母羊的母性行为和羔羊活力产生负面影响

摘要 本研究确定了粗放饲养下第二产程的持续时间在多大程度上影响初产 (P) 单胎 Corriedale 母羊 (n = 63) 的羔羊活力和母性行为。多产 (M) 母羊 (n = 116) 用作对照类别，在相同条件下饲养。产程分为4个时间组，G1：≤30分钟；G2：31-60 分钟；G3：61 - 90 分钟和 G4：每个母羊类别≥ 90 分钟。记录身体状况评分（BCS，0-5 级）、分娩持续时间、分娩协助、产妇行为评分（MBS，1-5）和分娩后是否梳理毛发并计算妊娠时间。羔羊出生时接受阿普加测试（评分 1-10）；记录出生前两小时站立和成功吸吮的时间，以及出生后前 72 小时内的出生体重 (BW) 和死亡率。不同类别的产前 BCS 相似，而 P 母羊的妊娠期较短（147.2 ± 0.3 对 148.0 ± 0.2 天，P = 0.0474），排出阶段较长（50.5 ± 4.2 对 32.2 ± 2.6 分钟，P