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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104576
Title The heritability of milk yield and fat percentage in the Friesian cattle in the province of Friesland
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door Shimy Abdel Fattah El-Shimy
Author(s) El-Shimy, S.A.F.
Publisher 's-Gravenhage : Excelsior
Publication year 1956
Description 75 p ill
Notes Proefschrift Wageningen
Tutors Jong, Prof. Ir. W. de
Graduation date 1956-03-23
Dissertation no. 202
Author abstract show 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.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,202
Keyword(s) (cab) genetics / heritability / genetic variation / cattle / raw milk / dairy breeds / productivity / profitability / animal husbandry / animal products / chemical composition / ingredients / netherlands / friesland
Categories Cattle / Races, Selection, Genetics
Publication type PhD thesis
Language English
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