Heritability coefficients of milk yield traits in standard lactation depend upon genetic variability that is directly affected by mean values and variability of traits investigated. Management, i.e., the herd’s production level, when the other influences are mainly similar, results in the changes of additive genetic variance expressiveness, thereby in heritability too. The investigations of the effects of production level on heritability of yield traits in standard lactation were earned out on the sample of 2947 first-calving cows, daughters of 21 bull-sires, produced on seven dairy farms of the Agricultural Corporation “Beograd”. All the first-calving cows were divided into two groups according to the average production of the farms that the cows were raised on: Group A - farms with above average production, and group B - farms with tiie bellow average production. The same sires were included in both groups. Heritability of milk, milk fat and 4% FCM yields in standard lactation was investigated. In Group A heritabilities were found to be by around 50% higher than in Group B
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 331–334, 1998
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