Effectiveness Of Selection

Traditional selection methods have provided rates of genetic response up to 3% of the mean per year, depending on species and trait.[4] Genetic responses are cumulative and can become appreciable over time. Expected genetic responses are often not realized because of changing economic situations that force producers to change their breeding objectives. Genetic change has been most noticeable in species with short generation intervals such as poultry and swine. Broiler chickens reach market weights significantly earlier on less feed than they did just 20 years ago, for example. Genetic responses in dairy cattle for production traits have been significant due to the ability to pick the best males on an international basis rather than within country.

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