Abstract

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.
 

R. D Shanks, Y. C Huang, J. L Robinson

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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