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Blood and milk protein polymorphisms in relation to feed efficiency and production traits of dairy cattle



Blood and milk protein polymorphisms in relation to feed efficiency and production traits of dairy cattle



Journal of Dairy Science 54(1): 106-112



The relationship was studied between 14 biochemical polymorphisms, including 9 blood antigens, serum transferrin and 4 milk-protein systems, and 8 quantitative traits consisting of measures of milk composition, food utilization efficiency, and consumption of dry matter. Data from 184 Holstein cows fed experimentally during their 1st lactation were recorded over 10 year-seasons from 14 sire groups on 4 different rations. In all cases, differences due to ration were large (P<0.01). Sire differences were next most important, and nearly all significant (P<0.05). Season was relatively unimportant as a cause of variation in food utilization efficiency but had significant effects on most other traits. A difference in dry matter consumption of 163 kg between F blood-antigen genotypes and 193 kg between M genotypes was significant. Differences in food utilization efficiency up to 3-4% for S blood-antigen genotypes and up to 2.4% for Lg genotypes were significant. Analysis with dry matter consumption as a covariate revealed significant genotype differences of up to 542 kg milk, 43 kg S.N.F., 58 kg total solids, 45 kg F.G.M. and 2.4% food utilization efficiency for the Lg system.

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Accession: 014363426

Download citation: RISBibTeXText

PMID: 5546182

DOI: 10.3168/jds.S0022-0302(71)85786-7



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