• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Second International Conference on Sustainable Agriculture for Food, Energy and Industry Vol.1 Sep 8-13, 2002 Beijing, China >Accuracy of Different Methods of Sire Evaluation for Production Efficiency Trait in Hariana Cattle
【24h】

Accuracy of Different Methods of Sire Evaluation for Production Efficiency Trait in Hariana Cattle

机译：哈里亚纳牛生产效率性状的父系评价不同方法的准确性。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The data pertaining to first lactation milk yield per day of lactation length (FLY/LL) collected from 512 Hariana cows, progeny of 20 sires maintained at Government Livestock Farm, Hisar during a period of 20 years (1974-93) were utilized to estimate and compare the sire's breeding values estimated by three methods viz., ordinary least-squares (OLS), regressed least-squares (RLS) and best linear unbiased prediction (BLUP). The same model was used for all the three procedures which included period and, season of calving as fixed effects, age at first calving as covariable and sire as random effect. Rank and product moment correlations among estimated sire merit obtained from OLS and RLS methods were high and significant indicating that these two methods are more or less similar for ranking of sires. OLS and RLS estimates of breeding value had negative rank and product moment association with estimates of breeding values obtained from BLUP. When comparison was made on the basis of coefficient of kurtosis, BLUP was the best method of sire evaluation while it was the second best when rest of the two criteria was considered. RLS cannot be recommended due to computational difficulty though coefficient of skewness and kurtosis obtained from the estimates of breeding value were close to normal distribution. It is recommended to use BLUP procedure in a situation where correct ratio of residual to sire variances is known. Use of OLS is recommended in a situation where correct ratio of residual to sire variances is unknown.
机译：利用从20年来（1974-93年）在Hisar的Government Livestock Farm饲养的512头Hariana母牛（后代）的每日泌乳长度（FLY / LL）的第一泌乳天数数据进行估算并比较通过三种方法（即普通最小二乘法（OLS），回归最小二乘法（RLS）和最佳线性无偏预测（BLUP））估算出的父亲的繁殖值。所有这三个过程均使用相同的模型，包括产犊的时间和季节，固定效应的产犊季节，首次产犊的年龄为协变量和父亲的产犊为随机效应。从OLS和RLS方法获得的估计父亲功绩之间的排名和乘积矩相关性很高且很显着，这表明这两种方法对父亲的排名或多或少相似。 OLS和RLS育种值估计值与从BLUP获得的育种值估计值之间具有负等级和乘积矩关联。当根据峰度系数进行比较时，BLUP是父亲评估的最佳方法，而同时考虑这两个标准的其余部分，则是次之。尽管从育种价值估算中获得的偏度和峰度系数接近于正态分布，但由于计算困难，不能推荐RLS。建议在已知残差与父亲差异正确比率的情况下使用BLUP程序。在残差与父亲差异的正确比率未知的情况下，建议使用OLS。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号