The beef cattle selection methods mainly include three methods: single selection method, independent elimination method and index selection method.

Single selection Single selection refers to selecting the traits to be improved one by one in sequence, that is, when the first trait is selected to achieve the breeding goal, the second trait is selected, and the selection is continued until all the traits are 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.

Independent elimination The independent elimination method refers to the selection of several traits at the same time and the establishment of the minimum standard. If there is one trait not enough standard, 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 index selection index selection method is based on the overall selection index. This index is a phenotypic value of a number of traits to be selected using quantitative genetics, based on heritability, economic importance, and phenotypic and genetic correlations between traits. This allows individuals to compare with each other. Numerical value.

In order to facilitate comparison, the value of the selection index of individuals whose traits are almost even in the herd is set to 100. Other individuals are compared with 100. If more than 100 are good, less than 100 need to be eliminated.

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