Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525564
Title The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland
Author(s) El-Shimy, S.A.F.
Source University. Promotor(en): W. de Jong. - 's-Gravenhage : Excelsior - 75
Publication type Dissertation, internally prepared
Publication year 1956
Keyword(s) genetica - heritability - genetische variatie - rundvee - rauwe melk - melkveerassen - productiviteit - rentabiliteit - dierhouderij - dierlijke producten - chemische samenstelling - ingrediënten - nederland - friesland - genetics - genetic variation - cattle - raw milk - dairy breeds - productivity - profitability - animal husbandry - animal products - chemical composition - ingredients - netherlands
Categories Cattle / Races, Selection, Genetics
Abstract 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.

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