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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 104482
Title Genetical and some environmental influences affecting the level of leucocyte counts in the milk of cows
show extra info.
door Y.A. Afifi
Author(s) Afifi, Y.A.
Publisher Wageningen : Veenman
Publication year 1967
Description 81 p
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Stegenga, Prof. Dr. T.
Graduation date 1967-10-13
Dissertation no. 415
Author abstract show abstract
The progeny groups of different sires varied widely in white-cell count in milk, even after exclusion of all cows which had suffered from mastitis. The sire had a demonstrable effect on white-cell count in milk, especially during the second half of lactation. Heritability estimates of white-cell count in milk showed that values for the fourth lactation were higher than those for heifers. But at the end of lactation heritability values for 4th lactation cows and heifers were nearly equal (about 0.40). The daughter groups with high average white-cell counts mostly showed frequent mastitis. There was a high phenotypic and genetic correlation between clinical mastitis and white-cell count. Within seasons for cows which, so far known, had never mastitis, very high and very low producers had higher white-cell counts than other cows. White-cell counts increased remarkably with advancing lactation. A relation between white-cell count and ease of milking could not be demonstrated.

Increasing milking vacuum over 40 cm mercury pressure, especially at the end of lactation, or increasing pulsation to over 50 per min. tended to increase white-cells. Milking routine (man/machine ratio) affected white-cell count in the end of lactation. More cows per milker increased the number of white-cells.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08200,415
FORUM ; STACKS ; NN08202,415
Keyword(s) (cab) cattle / raw milk / veterinary science / mammary glands / milk secretion / lactation / animal products / adulteration / contamination / aging / defects / deterioration / blood serum / fibrin / platelets / blood / erythrocytes / leukocytes / blood plasma / mastitis
Categories Cattle / Haematology and Body Fluids
Publication type PhD thesis
Language English
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