Agea Ivan, García María-Luz, Blasco Agustín, Argente María-José
Departamento de Tecnología Agroalimentaria, Universidad Miguel Hernández de Elche, Ctra de Beniel Km 3.2, 03312 Orihuela, Spain.
Institute for Animal Science and Technology, Universitat Politècnica de València, P.O. Box 22012, 46022 Valencia, Spain.
Animals (Basel). 2019 Aug 25;9(9):603. doi: 10.3390/ani9090603.
A divergent selection experiment on environmental sensitivity was performed in rabbits. The aim was to estimate the correlated response in kit weight and survival, litter weight, and weight distance from birth to weaning. The weight distance was calculated as the absolute value of the differences between the individual value and the mean value of its litter. The relationship between the probability of survival at 4 d of age, and the weight at birth, was studied. Environmental sensitivity was measured as litter size variability. A total of 2484 kits from 127 does from the low line, and 1916 kits of 114 does from the high line of the 12th generation were weighed. Both of the lines showed similar individual and litter weights at birth and weaning, and a similar survival rate at birth, and at 4 d of age. The survival rate at weaning was higher in the low line (0.67 and 0.62; P = 0.93). The weight distance was higher at birth, but lower at weaning in the low line (47.8 g and 54.1 g; P = 0.98). When the weight at birth was high, the kits had a higher survival rate. In conclusion, selection for environmental sensitivity showed a correlated response in the kits' survival, and in the homogeneity of litter weight at weaning.
在兔子身上进行了一项关于环境敏感性的 divergent 选择实验。目的是估计仔兔体重和存活率、窝仔重以及从出生到断奶的体重差异的相关反应。体重差异计算为个体值与其窝仔平均值之差的绝对值。研究了4日龄时的存活概率与出生体重之间的关系。环境敏感性以窝仔数变异性来衡量。对第12代低选系的127只母兔所产的2484只仔兔以及高选系的114只母兔所产的1916只仔兔进行了称重。两个品系在出生和断奶时的个体体重和窝仔重相似，出生时和4日龄时的存活率也相似。低选系断奶时的存活率更高（分别为0.67和0.62；P = 0.93）。低选系出生时的体重差异更大，但断奶时更小（分别为47.8克和54.1克；P = 0.98）。出生体重高时，仔兔的存活率更高。总之，对环境敏感性的选择在仔兔的存活以及断奶时窝仔重的同质性方面表现出相关反应。 （注：“divergent”这里可能是“差异的、不同的”之类意思，但不太明确准确意思，根据语境猜测翻译为“divergent” ）
