Prediction of reduction in aggressive behaviour of growing pigs using skin lesion traits as selection criteria
Prediction of reduction in aggressive behaviour of growing pigs using skin lesion traits as selection criteria
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DOI：
10.1017/s1751731116000112
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发表时间：
2016-08-01
期刊：
影响因子：
3.6
通讯作者：
Roehe, R.
中科院分区：
文献类型：
--
作者：
Desire, S.;Turner, S. P.;Roehe, R.
重组时的攻击性是养猪业中常见的问题。皮肤病变在遗传和表型上与攻击性相关，并且已被证明具有显著的遗传成分。本研究预测了复杂的攻击性行为特征的减少幅度时，使用病变数量在不同的身体部位在两个不同的时间点作为选择标准，以确定最佳的皮肤病变特征的选择目的。总共将1146头猪混合到新的社会群体中，并在混合后24 h（SL 24 h）和3周（SL 3 wk）对身体前部、中部和后部区域的皮肤病变进行计数。一个动物模型被用来估计遗传参数的皮肤病变性状和14个侵略性的行为特征。对估计的育种值（EBV）和表型值进行缩放和标准化，以允许在多个性状之间进行直接比较。将在最不具攻击性的10%群体中具有SL 24 h和SL 3 wk EBV的个体与群体平均值进行比较，以预测攻击性行为对选择的预期遗传和表型反应。在混合时，预测选择低前部病变比在其他身体部位获得的病变影响更多的攻击性行为特征，EBV在-0.21和-1.17 SD之间，低于群体平均值。具有低中心SL 24 h EBV的个体对于攻击性特征也具有低EBV（-0.33至-0.55）。具有高SL 3 wk EBV的个体在混合时具有低的攻击性EBV（在群体平均值以下-0.24和-0.53SD之间），尽管预测这比针对SL 24 h的选择影响更少的性状。这些结果表明，对前SL 24 h的选择将导致在混合时记录的攻击行为的最大遗传和表型减少。增加SL 3 wk的选择，预计减少侵略混合，但是，目前的理解攻击行为在稳定的社会条件下是不够的，建议使用这种特性的选择目的。
Aggression at regrouping is a common issue in pig farming. Skin lesions are genetically and phenotypically correlated with aggression and have been shown to have a significant heritable component. This study predicts the magnitude of reduction in complex aggressive behavioural traits when using lesion numbers on different body regions at two different time points as selection criteria, to identify the optimum skin lesion trait for selection purposes. In total, 1146 pigs were mixed into new social groups, and skin lesions were counted 24 h (SL24h) and 3 weeks (SL3wk) post-mixing, on the anterior, centre and posterior regions of the body. An animal model was used to estimate genetic parameters for skin lesion traits and 14 aggressive behavioural traits. Estimated breeding values (EBVs) and phenotypic values were scaled and standardised to allow direct comparison across multiple traits. Individuals with SL24h and SL3wk EBVs in the least aggressive 10% of the population were compared with the population mean to predict the expected genetic and phenotypic response in aggressive behaviour to selection. At mixing, selection for low anterior lesions was predicted to affect substantially more behavioural traits of aggressiveness than lesions obtained on other body parts, with EBVs between -0.21 and -1.17 SD below the population mean. Individuals with low central SL24h EBVs also had low EBVs for aggressive traits (-0.33 to -0.55). Individuals with high SL3wk EBVs had low EBVs for aggression at mixing (between -0.24 and -0.53 SD below the population mean), although this was predicted to affect fewer traits than selection against SL24h. These results suggest that selection against anterior SL24h would result in the greatest genetic and phenotypic reduction in aggressive behaviour recorded at mixing. Selection for increased SL3wk was predicted to reduce aggression at mixing; however, current understanding about aggressive behaviour under stable social conditions is insufficient to recommend using this trait for selection purposes.