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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,...
The effect of inbreeding on milk and fat yield and fat content in milk in the first three lactation periods of red-white cows was determined by means of linear and parabolic regression. The calculations were made within the group of sires for low, medium and high production levels and irrespective of the herd's productivity. Inbreeding led to a slight depression in milk and fat yield -7.5 kg and -0...
Исследования провели на государственной станции племенно-животноводческой станции в Глогувке, на 1115 первотелках низинной кросно-пестрой породы. Каждую первотелку взвешивали в возрасте 18 месяцев, на 10 день перед отелом и 10, 100, 200 и 300 день после отела. Сопоставили их в 3 группах в зависимости от их суточных привесов, от рождения до 18 месяца мизни. I группа — до 650 г, II группа — от 651 до...
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