Estimate Breeding Value, Variance and Gene Substitution  Effect on Some Productive Traits on Holstein Cows Depending  on DRB3 Gene Information

Authors

Breeding value, Gene substitution effect, Productive traits, Holstein Cows

This study was conducted in Al-Salam station for Dairy cattle / private sector, (Al-Latifia district 25 km

southern Baghdad), for the period from 1-11-2016 to 1-11-2017, on 50 Holstein cows to estimate breeding

value, dominance deviation which made genetic variation for milk production and length of peak of

lactation depending on DRB3 gene information and estimate average allele effect and average effect of

allele substitution. The results of this study showed a significant effect (P<0.05) of gene polymorphism on

both traits, cows with AA genotype were better than cows with AB, BB respectively, also cows with AA

genotype were better than cows with AB, BB genotype in breeding value for both traits, as that additive

variance was higher than dominance deviation for both traits, and the average effect of allele substitution

for allelic A was positive than allelic B and for both traits, that confirms the importance of used DRB3 gene

data for breeding programs and the importance for allelic A selection when it found in a homozygotes or

heterozygotes for both traits.

Al-Waith H.K1 , Riyadh Hamad Senkal1 , Al-Jubori O. S.1

1Department of Animal Production, College of Agricultural Engineering Sciences, University of Baghdad, Iraq