First, after selecting the target for the stability of seed selection targets, we must stick to implementation and maintain relative stability.
II. Accuracy of seed selection basis Selection effects of seed selection depend to a large extent on the completeness of dairy cattle records. Measurements and records of various phenotypic values ​​are true and reliable. At the same time, it depends on what kind of methods are selected and what data are used. Selection.
Third, the heritability and genetics of the traits The heritability of the selected traits has a direct impact on the selection effect. The genetic correlation between the traits has a greater impact on the seed selection effect.
Fourth, the choice of the difference and the choice of intensity If the retention rate is small, the degree of variation is large. At this time, the greater the difference between the selection and the selection, the better the effect of seed selection.
5. The interval between generations of generations of cows is generally 5 years. This length of time affects the pace of improvement and the breeding process, so steps must be taken to reduce the generational gap.
Six, the number of traits selected Select the traits should focus, not too much.
VII. The phenotypic value of any quantitative trait in the environment is the result of a combination of genetic and environmental factors. As environmental conditions change, phenotypic values ​​change in varying degrees.
II. Accuracy of seed selection basis Selection effects of seed selection depend to a large extent on the completeness of dairy cattle records. Measurements and records of various phenotypic values ​​are true and reliable. At the same time, it depends on what kind of methods are selected and what data are used. Selection.
Third, the heritability and genetics of the traits The heritability of the selected traits has a direct impact on the selection effect. The genetic correlation between the traits has a greater impact on the seed selection effect.
Fourth, the choice of the difference and the choice of intensity If the retention rate is small, the degree of variation is large. At this time, the greater the difference between the selection and the selection, the better the effect of seed selection.
5. The interval between generations of generations of cows is generally 5 years. This length of time affects the pace of improvement and the breeding process, so steps must be taken to reduce the generational gap.
Six, the number of traits selected Select the traits should focus, not too much.
VII. The phenotypic value of any quantitative trait in the environment is the result of a combination of genetic and environmental factors. As environmental conditions change, phenotypic values ​​change in varying degrees.
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