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13476 pairs of mothers and daughters from 165 herds of red-white cattle used In 1963-1983, in Low Silesia and Opole region were studied. The values of all the traits analysed /milk and fat yield, fat content in milk/ were expressed as deviations of the means for the herd-year. Corrections were made for age and the season of calving. The evaluations were based upon the data referred to above; heritability,...
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