Conclusion
In this course, we have seen that the phenotype of an animal is expressed as an interaction between the genotype and environmental effects. Hence if we want to improve the genotype of an animal we need to have records about:
Phenotypes for different traits (in that case, milk, fat and protein yields records, reproductive records, health records, etc.)
Phenotypes of daughters must be recorded in different environments.
Hence, having genetic gains for interesting traits requires an implementation of specific breeding programs according breeds or selection cores.
