母羊与双胞胎羔羊的分离:在几个羊品种中的发病率

G. Alexander , D. Stevens , R. Kilgour , H. de Langen , B.E. Mottershead , J.J. Lynch
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引用次数: 0

摘要

母羊和它们的小羊在出生后的头一两天,母羊和它们的小羊在一起的能力,当母羊和后代的关系正在巩固的时候,在细毛美利奴羊、多塞特角羊和杂交羊(边界莱斯特×美利奴羊与萨福克公羊交配)中进行了研究,这些羊在新州阿米代尔地区一个稀疏的牧场上产羔,在新西兰曼加基诺地区一个良好的牧场上产羔。新西兰羊群中的母羊之所以被选中,是因为它们有能力饲养一只以上的羊羔。46%的双胎美利奴羊与羔羊永久分离,主要是在分娩后的第二天,至少54%的病例没有明显的促发因素,如分娩困难或其他羊的干扰。此外,34%的双胎美利奴羊经历了与一只羔羊的短暂分离。相比之下,在其他鸡群中,永久分离率分别为17%、0%和8%,并且总能识别出一些沉淀因素。很少有分离与人为干扰有关。阿米代尔的绵羊从出生地点移动的速度比罗姆尼的要快得多(平均2小时对6.5小时),可能是由于牧场条件稀少。在美利奴羊中,分离的比例随着母羊在出生地点附近停留的时间的增加而降低。观察结果表明,细毛美利奴母羊对幼崽大小的识别速度较慢,而且在新生儿期与多只羔羊保持接触的能力也较差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Separation of ewes from twin lambs: Incidence in several sheep breeds

The ability of ewes and their lambs to keep together during the first day or two of life, when the mother—offspring bond is consolidating, was examined in fine-wool Merino, Dorset Horn and Crossbred (Border Leicester × Merino ewes mated to a Suffolk ram) sheep, lambing on a sparse pasture in the Armidale district of N.S.W., and in a Romney flock, lambing on good pasture in the Mangakino district of New Zealand. Ewes in the N.Z. flock had been selected for their ability to rear more than one lamb.

46% of the twin-bearing Merinos became permanently separated from a lamb, mostly on the day after giving birth, and in at least 54% of these cases these was no obvious precipitating factor such as birth difficulties or interference by other sheep. In addition, a further 34% of twin-bearing Merinos experienced temporary separation from one lamb. By contrast, in the other flocks, permanent separations were 17, 0 and 8%, respectively, and some precipitating factor could always be identified. Few separations were associated with human interference.

The sheep at Armidale moved from the birth-site much more rapidly than the Romneys (means of 2 h versus 6.5 h), possibly due to sparse pasture conditions. In the Merinos, the proportion of separations decreased as the time that ewes remained near the birth-site increased. The observations indicate that fine-wool Merino ewes are slow to recognize the size of their litters and inherently poor at maintaining contact with more than one lamb in the neonatal period.

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