Bovine citrullinemia was not useful as a marker for milk, fat or protein production because 1) the frequency of defective allele was low and 2) within family differences were nonsignificant between homozygous normal and heterozygous half-sibs. Several genetic and phenotypic traits were tested to detect differences between normal and heterozygotes for citrullinemia. Collectively a plot of probability of significance by standardized regression coefficient for 53 traits approximated a normal distribution. Unique differences in performance between genotypes were not detected. Age at first classification was 4.5 months younger for heterozygotes than for cows normal at citrullinemia locus.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 319–322, 1994
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