Dairy Science Department
BS in Dairy Science
The objective of this project was to examine the relationship between the genomic value inbreeding coefficient and the pedigree value inbreeding coefficient. Hair samples were collected from 50 registered Holstein heifers from Airosa Dairy Tipton, California. The 50 hair samples were sent to Pfizer Animal Genetics for the genomic inbreeding values. DNA was extracted from the hair sample and ran through a low-density DNA SNP marker. Two values were computed from the genomic test; the future inbreeding value and the individual inbreeding value. The registered identification numbers of each of the heifers was also sent to the United States Holstein Association to obtain the pedigree inbreeding coefficient. Both the averages and standard deviations were computed for the three inbreeding values. Deviations were computed between the three inbreeding coefficients to examine how closely related the coefficients were. The standard deviation of the genomic individual inbreeding coefficient was greater than the pedigree coefficient. The standard deviation value computed from the pedigree was 1.8 percent and the genomic value for the individual inbreeding value was 2.4 percent. The average of the inbreeding coefficients resulted in the pedigree value being greater than the individual genomic value. Correlations were computed between the three inbreeding coefficients. When looking at the correlation between the production traits and inbreeding coefficient, the pedigree and individual inbreeding values favorably correlated to the type traits The correlation of the future inbreeding value indicated that the superior animals in the herd were more closely related to the population with the exception of the SCS trait.