The aim of the present work was to verify in cases of some growth traits if the heterozygotes are superior or not to homozygotes as regards their average value of variability. Data from 171 females, 2 - 3 years old, of canchim breed of cattle were used. Three biochemical loci were analysed: Hemoglobin (Hb), Transferrin (Tf) and Albumin (Alb). The following growth traits were studied: birth weight, weaning weight, weight at 12, 18 and 24 months and mean birth weight of the offspring of each cow. The degree of heterozygosity of each animal was determined as heterogosity loci/total number of loci. Four degrees of heterozygosity were considered: 0%, 33%, 67% and 100%. The degree of heterozygosity affects only the mean of two characteristics: birth weight and mean birth weight of the offspring, which in both cases, the means increased with the increasing of the degree of heterozygosity. The variability of all the characteristics were affected by the degree of heterozygosity, increasing for weaning and weight at 12, 18 and 24 months, and decreasing for the other characteristics studied. The largest variance values were observed for the 67% degree of heterozygosity.

J. Bortolozzi, P. RR Ramos, P. R Curi

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 318–323, 1986
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