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The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland
Author(s) -
ElShimy Shimy Abdel Fattah
Publication year - 1957
Publication title -
zeitschrift für tierzüchtung und züchtungsbiologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.689
H-Index - 51
eISSN - 1439-0388
pISSN - 0044-3581
DOI - 10.1111/j.1439-0388.1957.tb00286.x
Subject(s) - heritability , zoology , yield (engineering) , combinatorics , physics , mathematics , biology , genetics , thermodynamics
The heritability of milk yield and fat percentage was calculated of herd-registered cattle in Friesland. The estimates were based on daughter-dam comparisons. Comparisons covered the first three lactations. The average heritability estimates of milk yield within sires, and according to the different kinds of soil, were 35.50 and 37.38 %, with daughter-dam regression and dam-daughter correlation, respectively. Under the same conditions the figures for fat percentage were 76.52 and 81.58 %, respectively. When the effect of different soils was ignored, average heritability estimates for milk were 36.58 and 38.60 %, respectively. The corresponding figures for fat percentage were 76.40 and 81.60 %, respectively. If the figures were not calculated on within-sire basis, the average heritability for milk yield was 39.60 and 40.60 %; whereas for fat percentage the estimates were 84.44 and 83.52 %, as calculated from daughter-dam regression, and damdaughter correlation, respectively. The most reliable estimates of heritability were by the within-sire daughterdam regression calculated for each of the different soil types.