Vol. 9, Issue 1, Part K (2024)

Author(s): Garima Choudhary, U Pannu and GC Gahlot

Abstract: First lactation data of 91 Tharparkar dairy cows from 10 sires were analyzed to estimate the breeding values of the sires by observing the first lactation reproduction traits (AFC, FSP and FCI) using simple daughter’s average method (D), Contemporary comparison method (CC), least-squares method (LSM) and best linear unbiased prediction (BLUP). Using, CC, LSM and BLUP methods of sire evaluation the average breeding value of sires for age at first calving was 1509.60, 1512.70, 1580.43 and 1575.58 days respectively, the mean breeding value of sires for first service period were 148.06, 149.75, 151.51 and 151.49 days respectively, average breeding value of sires for first calving interval was 421, 422.27, 432.89 and 432.63 days respectively. The LSM method is found best method of sire evaluation in this study due to its lowest error variance and highest coefficient of determination whereas BLUP method follows. Higher rank correlation between LSM and BLUP methods of sire evaluation indicated that there was higher degree of similarity of ranking of the sires by both the methods of sire evaluation.