Evaluation of Sires Using Different Multitrait Sire Evaluation Methods in Crossbred Cattle

摘要

The data for the present investigation were obtained from the performance records of 1081 crossbred cattle progeny of 65 sires maintained at Instructional Dairy Farm Nagla of G.B, Pant University of Agriculture & Technology Pantnagar, distributed overa period of 40 years from 1966-2005. A total of 65 sires were evaluated on the basis of single and multi traits of their progeny. For single trait sire evaluation, FLMY was considered as principal trait under univariate models viz. least squares method(LSM), DFREML-I method and BLUP-I method. However, for evaluation of sires by multi traits FLMY+AFC, FLMY+FLP and FLMY+AFC+FLP, the multivariate models viz. DFREML-II, DFREML-III, DFREML-IV, BLUP-II, BLUP-IH and BLUP-IV method were used. The accuracy, efficiency and stability of different sire indices were compared to judge their effectiveness. The error variance of single trait BLUP method was found lowest and, therefore, it was considered to be most efficient out of all sire evaluation methods. Rank correlations between different sire evaluation methods ranged between 0.882 (DEFEML-IV with BLUP III) and 0.998 (DFREML-I with DFREML-III and BLUP-I). All the values were positive and highly significant (P<0.01) indicating that there was higher degree ofsimilarity in ranking of sires by different methods.