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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 104349
Title Melkbaarheidsonderzoek bij het zwartbonte vee in Friesland
show extra info.
door J. Keestra
Author(s) Keestra, J.
Publisher Wageningen : Pudoc
Publication year 1963
Description 153 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
ISBN 9022000885
Tutors Stegenga, Prof. Dr. T.
Graduation date 1963-07-03
Dissertation no. 351
Author abstract show abstract
Various aspects of the ease of milking of more than a thousand cows were studied with a Gascoigne individual-quarter milking machine (pulsation ratio 3:1, pulsation rate 60 cycles per minute). Progeny groups from 17 bulls used in artificial insemination (420 heifers) were recorded twice and 75 cows on 9 different farms were tested on 16 occasions during lactation.

Wide variation existed in peak flow (x = 2.13,σ= 0.70, C.V. = 33 %) and average flow (x = 1.70,σ= 0.58, C.V. = 34%). From paternal half-sib correlations, high heritability estimates of 0.65 ± 0.11 and 0.56 ± 0.10 were found for these features. Selection on peak flow could be especially effective. An accurate progeny test could be based on a sample of 25 daughters, while individual cows (bull dams) could be tested very accurately with 4 test milkings (repeatability 0.7). A correction for a standard milk yield of 7 kg was necessary for comparison.

There was a sufficient variation in percentage milk in fore quarters x = 43.5,σ= 6.05, but heritability was lower (0.26 ± 0.28). No significant correlation was found with peak flow, machine time and quantity of stripping. Selection on this character was of minor importance.

The average stripping yield by hand was 361 ml with wide variation, but very low heritability (0. 12 ± 0.24). Selection on this character was almost impossible.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,351
FORUM ; STACKS ; NN08200,351
Keyword(s) (cab) cattle / dairy breeds / productivity / profitability / animal husbandry / netherlands / friesland
Categories Cattle
Publication type PhD thesis
Language Dutch; Flemish
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