Estimation of milk protein gene frequencies in crossbred cattle by maximum likelihood.

H. Bovenhuis, J.A.M. van Arendonk

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

A maximum likelihood method is presented to estimate the fraction of animals misclassified and breed effects for milk protein gene frequencies based on crossbred data. A simulation study indicates that the method provides estimates of gene frequencies that agree closely with the true values. Gene frequencies in the Dutch Black and White and the Dutch Red and White crossbred populations, based on data on 10,151 and 580 animals respectively, were estimated. Dutch Friesian and Holstein-Friesian breeds differ in gene frequencies for ß-casein and ß-lactoglobulin. Estimates for fractions misclassified are zero for s1-casein, .09 for ß-casein and ß-lactoglobulin, and .12 for -casein. Differences between Dutch Red and Whites and Red Holstein-Friesian breeds are small, and estimates for fractions misclassified are high but have high approximate standard errors. Compared with the Black and White breeds, the Red and Whites have a high -casein B gene frequency.
Original languageEnglish
Pages (from-to)2728-2736
JournalJournal of Dairy Science
Volume74
Issue number8
DOIs
Publication statusPublished - 1991

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