Abstract：
Temperament (docility) is a key breeding goal in the cattle industry due to its direct relationship with animal welfare, cattle handler\'s safety and animal productivity. Over the past six decades, numerous studies have reported heritability estimates for temperament-related traits in cattle populations ranging from low to high values. Therefore, the primary objective of this study was to perform a comprehensive systematic review with meta-analysis to obtain weighted estimates of heritability for temperament-related traits in worldwide cattle populations. After data editing and quality control, 106 studies were included in the systematic review, of which 29.2% and 70.8% reported estimates of heritability for temperament-related traits in dairy and beef cattle populations, respectively. Meta-analyses were performed for 95 heritability estimates using a random model approach. The weighted heritability estimates were as follow: (a) flight score at weaning = 0.23 (95% CI: 0.15-0.32); (b) flight speed at weaning = 0.30 (95% CI: 0.26-0.33); (c) joint analysis of flight speed and flight score at weaning = 0.27 (95% CI: 0.22-0.31); (d) flight speed at yearling = 0.26 (95% CI: 0.21-0.30); (e) joint analysis of flight speed at weaning and yearling = 0.27 (95% CI: 0.24-0.30); (f) movement score = 0.12 (95% CI: 0.08-0.15); (g) crush score at weaning = 0.21 (95% CI: 0.17-0.25); (h) pen score at weaning = 0.27 (95% CI: 0.19-0.34); (i) pen score at yearling = 0.20 (95% CI: 0.17-0.23); (j) joint analysis of pen score at weaning and yearling = 0.22 (95% CI: 0.18-0.26); (k) cow\'s aggressiveness at calving = 0.10 (95% CI: 0.01-0.19); (l) general temperament = 0.13 (95% CI: 0.06-0.19); (m) milking temperament = 0.16 (95% CI: 0.11-0.21); and (n) joint analysis of general and milking temperament = 0.14 (95% CI: 0.11-0.18). The heterogeneity index ranged from 0% to 77%, and the Q-test was significant (p < 0.05) for four single-trait meta-analyses. In conclusion, temperament is moderately heritable in beef cattle populations, and flight speed at weaning had the highest weighted heritability estimate. Moreover, between-study heterogeneity was low or moderate in beef cattle traits, suggesting reasonable standardization across studies. On the other hand, low-weighted heritability and high between-study heterogeneity were estimated for temperament-related traits in dairy cattle, suggesting that more studies are needed to better understand the genetic inheritance of temperament in dairy cattle populations.
摘要：
气质（顺从）是养牛业的关键育种目标，因为它与动物福利有直接关系，牛管理员的安全和动物生产力。在过去的六十年里，许多研究报告了牛种群中与气质相关的性状的遗传力估计，从低到高值不等。因此,本研究的主要目的是通过荟萃分析进行全面的系统评价，以获得全球牛群气质相关性状的遗传力的加权估计。经过数据编辑和质量控制，106项研究纳入系统评价，其中29.2%和70.8%报告了奶牛和肉牛群体气质相关性状的遗传力估计，分别。使用随机模型方法对95个遗传力估计值进行了荟萃分析。加权遗传力估计如下；（a）断奶时的飞行得分=0.23（95％CI：0.15-0.32）和90％CI分析；（b）断奶时的飞行速度=0.30（95％CI：0.26-0.33）0.19；（d）断奶时的飞行速度和飞行得分=0.27（95％CI：0.22-0.31）断奶时0.19分0.21（95％CI=0.19异质性指数范围从0%到77%，对于四个单性状荟萃分析，Q检验显着（p<0.05）。总之,气质在肉牛种群中是中等可遗传的，断奶时的飞行速度具有最高的加权遗传力估计。此外，肉牛性状的研究间异质性低或中等，建议跨研究的合理标准化。另一方面,对奶牛气质相关性状的低加权遗传力和高研究间异质性进行了估计，这表明需要更多的研究来更好地了解奶牛群体气质的遗传遗传。
