牛的生长,尸体和早熟性的直接遗传概率估计 角质 (Cornu aspersum maxima) (同义词 螺旋 (Helix aspersa maxima))
Thamires Aparecida Leôncio1, Natalia Costa da Silva1, José Teodoro de Paiva2
1Federal University of São João del-Rei, São Joao del-Rei, Brazil.
概括
牛 (Cornu aspersum maximum) 的体重增加是遗传的,早期生长 (WG1) 是选择最有效的时期. 早期选择体重增加可以提高牛的整体表现.
科学领域:
- * 动物科学 动物科学
- * * 定量遗传学 是一个学科.
- *直升机培养活动
背景情况:
- *了解遗传参数对于提高牛养殖效率至关重要.
- * 遗传性和遗传相关性为家畜的选择性育种策略提供信息.
- *Cornu aspersum maximum是一个商业上重要的牛物种.
研究的目的:
- * 为了估计生长的遗传性,尸体的特征,以及在Cornu aspersum最大的第一个卵位时的年龄.
- * 确定这些特征之间的遗传相关性.
- * 确定牛繁殖计划的最佳选择标准.
主要方法:
- * 贝叶斯推理用于单个和双特征分析.
- * 应用了一种包含随机动物效应和系统环境效应的动物模型.
- *分析的特征包括体重增加 (WG1,WG2,WG3),屠宰前体重 (PRE),肉与贝的比率 (MS),尸体产量 (CY) 和首次排卵时的年龄 (AFO).
主要成果:
- *体重增加 (WG1,WG2,WG3) 的遗传概率估计分别为0.59,0.60和0.32.
- * PRE,MS,CY和AFO的遗传率在0.22到0.51之间.
- * 在连续增加体重之间发现了积极的遗传相关性 (WG1-WG2:0.74;WG2-WG3:0.57),而WG1-WG3是无意义的 (0.22).
结论:
- *60至90天 (WG1) 之间的体重增加是高度遗传的,并且是评估牛表现的最佳选择.
- *选择WG1可以导致后续体重增加的遗传改善 (WG2).
- *环境因素显著影响屠宰前的体重,而尸体的特征和第一次排卵时的年龄显示出估计的不确定性很大.
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