Summary
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1.
Methods of estimating the rate of genetic gain achieved in animal improvement are discussed and criticized.
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2.
A theoretical method of estimation of the maximum possible genetic gain of milk yield under direct selection is presented for a closed herd of dairy cattle. The maximum possible gain is approximately 1% of the average yield.
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3.
The method can also be used for the estimation of genetic gain from the selection practised in an actual, herd. An estimated gain of milk yield of 0.7% per year is given for one herd.
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Rendel, J.M., Robertson, A. Estimation of genetic gain in milk yield by selection in a closed herd of dairy cattle. Journ. of Genetics 50, 1–8 (1950). https://doi.org/10.1007/BF02986789
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DOI: https://doi.org/10.1007/BF02986789