Mother-young spatial association and its relation with proximity to a fence separating ewes and lambs during enforced weaning in hair sheep (Ovis aries)
Mother-young spatial association and its relation with proximity to a fence separating ewes and lambs during enforced weaning in hair sheep (Ovis aries)
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DOI：
10.1016/j.applanim.2006.10.016
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发表时间：
2007-12-01
影响因子：
2.3
通讯作者：
Vazquez, Reyes
中科院分区：
文献类型：
--
作者：
Galeana, Lucia;Orihuela, Agustin;Vazquez, Reyes
这项工作研究了随着年龄的增加，羔羊和接近围栏分离母羊和羔羊在人工断奶期间，母婴空间关联的变化。使用了25只圣克鲁瓦白色毛母羊及其双胞胎羔羊。在研究的第一部分期间，记录了产后35至63天羔羊与其母亲之间的距离。在第二阶段，羔羊在断奶时（当羔羊64天大时）通过铁丝网与它们的母亲分开，但它们的母亲完全可以看到。随着试验的进行，母子间距离逐渐增大（y = 1.35x（0.38）），不受羔羊性别和兄弟姐妹与母亲距离的影响（P > 0.05）。断奶后，在隔离后24、48和72 h，观察母羊在距离围栏线< 1 m处观察的平均次数/h无差异（P > 0.05）（分别为2.17 +/- 0.47、1.5 +/- 0.39和0.42 +/- 0.16）。分离后72 h与24 h相比，细胞凋亡率显著下降（P < 0.05）。相比之下，在隔离24、48和72 h时，观察到羔羊在围栏线附近的平均观察次数/h（P > 0.05（分别为2.00 +/- 0.30、2.07 +/- 0.25和1.58 +/- 0.21），或在24至72小时之间（P > 0.05）。断奶前母羊-羔羊距离与母羊靠近围栏次数的相关系数为-0.27（P = 0.10），与羔羊靠近围栏次数的相关系数为-0.38（P < 0.05）。得出的结论是，断奶前与母亲（产后35-63天）有密切空间联系的羔羊，在64日龄强制断奶期间更有可能接近将其与母亲分开的铁丝网。(C)2006 Elsevier B. V.保留所有权利。
This work examined the changes in mother-young spatial association with increasing age of lambs and proximity to a fence separating ewes and lambs during artificial weaning. Twenty-five St. Croix white hair ewes and their twin lambs were used. During the first part of the study the distance between the lambs and their mothers from days 35 to 63 postpartum was recorded. In phase two, lambs were separated from their dams by a wire fence at weaning (when lambs were 64 days of age) but with full view of their mothers. The distance between mother and young increased progressively as the experiment advanced (y = 1.35x(0.38)) and was not influenced (P > 0.05) by the sex of the lamb or distance of the sibling from their mother. After weaning, no difference (P > 0.05) was observed in the average number of times/h of observation ewes were observed at < 1 m from the fence line between 24, 48 and 72 h after separation (2.17 +/- 0.47, 1.5 +/- 0.39 and 0.42 +/- 0.16, respectively). However, a significant (P < 0.05) decline was observed at 72 h in comparison with 24 h after separation. In contrast, no difference (P > 0.05) was observed in the average number of times/h of observation that lambs were observed in proximity to the fence line at 24, 48 and 72 h of separation (2.00 +/- 0.30, 2.07 +/- 0.25 and 1.58 +/- 0.21, respectively), or between 24 and 72 h (P > 0.05). The correlation between the ewe-lamb distance before weaning and the number of times the ewe was observed close to the fence was -0.27 (P = 0.10) while with the lamb's proximity it was -0.38 (P < 0.05). It was concluded that lambs that had a close spatial association with their mother (35-63 days postpartum) before weaning, are more likely to approach a wire fence separating them from their mother during enforced weaning at 64 days of age. (C) 2006 Elsevier B.V. All rights reserved.