Beef selection method

The beef cattle selection method mainly includes three methods: single selection (column selection or convergence selection), independent elimination method and index selection method. (1) Single selection method Single selection method refers to selecting the traits to be improved one by one in sequence, that is, when the first trait is selected to reach the breeding target, the second trait is selected, and so on until all traits are selected. Improved. This method is simple and easy to implement, and its selection effect is good for a certain trait. The main disadvantage is that when one trait is selected at a time, the cattle with poor traits at the same time will still stay in the group, affecting the quality of the entire herd. (II) Independent Elimination Laws Independent Elimination Laws refer to selecting several traits at the same time and setting the minimum standards respectively. As long as one trait is not enough, it will be eliminated. This method is simple and easy, and can receive the effect of comprehensively improving the selection effect. However, as a result of this method selection, it is easy to eliminate individuals with only certain individual traits that do not meet the criteria and others are excellent. The disadvantage of this method is that the economic importance of the various traits and the degree of heritability are not considered. (iii) Index selection method The index selection method is based on a comprehensive selection index. This index is based on the principle of quantitative genetics, the phenotypic value of several traits to be selected, and a formula based on heritability, economic importance, and phenotypic correlation and genetic correlation between the traits, given different appropriate weights. The value that compares individuals to each other. In order to facilitate comparison, the value of the selection index of individuals whose traits are almost equal to that of the cattle is defined as 100. Other individuals are compared with 100. For example, if the super-talent is 100, the less than 100 will need to be eliminated. The effect of the index selection method depends on whether the weighting value is reasonable or not. The weighting value of each trait is determined mainly by the relative economic value of the traits and the genetic correlation between the heritability and traits of each trait. In addition, the best methods for selecting beef cattle breeds include the best linear prediction method (BLUP method) and the new animal model method.

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