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 401831
Title Association of bovine ß-casein protein variant I with milk production and milk protein composition
Author(s) Visker, M.H.P.W.; Dibbits, B.W.; Kinders, S.M.; Valenberg, H.J.F. van; Arendonk, J.A.M. van; Bovenhuis, H.
Source Animal Genetics 42 (2011)2. - ISSN 0268-9146 - p. 212 - 218.
Department(s) Animal Breeding and Genetics
Product Design and Quality Management Group
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) finnish ayrshire cows - production traits - genetic-parameters - polymorphisms - genotypes - holstein - cattle - haplotypes
Abstract The aim of this study was to detect new polymorphisms in the bovine ß-casein (ß-CN) gene and to evaluate association of (new) ß-CN protein variants with milk production traits and milk protein composition. Screening of the ß-CN gene in genomic DNA from 72 Holstein Friesian (HF) bulls resulted in detection of 19 polymorphisms and revealed the presence of ß-CN protein variant I in the Dutch HF population. Studies of association of ß-CN protein variants with milk composition usually do not discriminate protein variant I from variant A2. Association of ß-CN protein variants with milk composition was studied in 1857 first-lactation HF cows and showed that associations of protein variants A2 and I were quite different for several traits. ß-CN protein variant I was significantly associated with protein percentage and protein yield, and with as1-casein (as1-CN), as2-casein (as2-CN), ¿-casein (¿-CN), a-lactalbumin (a-LA), ß-lactoglobulin (ß-LG), casein index and casein yield. Inferring ß-¿-CN haplotypes showed that ß-CN protein variant I occurred only with ¿-CN variant B. Consequently, associations of ß-¿-CN haplotype IB with protein percentage, ¿-CN, a-LA, ß-LG and casein index are likely resulting from associations of ¿-CN protein variant B, while associations of ß-¿-CN haplotype IB with as1-CN and as2-CN seem to be resulting from associations of ß-CN variant I.
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