Animal Model Versus Conventional Methods of Sire Evaluation in Sahiwal Cattle

Abstract

A total of 1,367 first lactation records of daughters of 81 sires, having 5 or more progeny were used to evaluate sires by 3 different methods viz., least squares (LS), best linear unbiased prediction (BLUP) and derivative free restricted maximum likelihood (DFREML) method. The highest and lowest overall average breeding value of sires for first lactation 305 days or less milk yield was obtained by BLUP (1,520.72 kg) and LS method (1,502.22 kg), respectively. The accuracy, efficiency and stability of different sire evaluation methods were compared to judge their effectiveness. The error variance of DFREML method was lowest (191,112 kg 2 ) and its coefficient of determination of fitting the model was highest (33.39%) revealing that this method of sire evaluation was most efficient and accurate as compared to other methods. However, the BLUP method was most stable amongst all the methods having coefficient of variation (%) very near to unadjusted data (18.72% versus 19.89%). The higher rank correlations (0.7979 to 0.9568) between different sire evaluation methods indicated that there was higher degree of similarity of ranking sires by different methods ranging from about 80 to 96 percent. However, the DFREML method seemed to be the most effective sire evaluation method as compared to other methods for the present set of data.

Efficiency of sire evaluation methods by using phase and stayablity traits to improve milk yield of Murrah buffaloes

“…All the product moment correlations between estimated sire merit calculated by different methods were also very high and ranged from 0.83 to 0.99 for OLS X BLUP, RLS X BLUP and OLS X RLS for APY, DPY, STAYAB and APY respectively (Table 4). Similar findings also reported by various researchers: Dalal et al (1999), Gaur et al (2001), Dubey et al (2006), Dhaka et al (2004), Banik and Gandhi (2006), Bajetha (2006), Mukherjee et al(2007), Kumar et al (2008) and Moges et al (2009). Rank and product moment correlations among sire merit calculated by various sire evaluation procedures for different production efficiency traits revealed that product moment correlations were comparatively higher than those of rank correlations barring few exceptions.…”

“…Therefore, suitable selection criterion which gives best discrimination among sires should be formulated to evaluate sires on the basis of performance of their daughters considering both phase as well as stayablity life traits. To improve the efficiency and accuracy of sire evaluation programmes many sire indices has been developed by using the procedures of Least -Squares (OLS), Regressed Least -Squares (RLS) and Best Linear Unbiased Prediction (BLUP).The literature is dotted with conflicting reports Pundir et al (2004); Dhaka et al (2004); Banik and Gandhi, (2006) ;Raja, (2010) on comparative evaluation of various sire evaluation techniques in Murrah buffaloes. Therefore, an effort has been made to estimate breeding values for different phase and stayablity life traits by different methods in Murrah buffalo and comparison of these methods to find out the most suitable method for sire evaluation.…”

Estimation of Breeding Values by Different Sire Evaluation Methods for Selection of Sires in Crossbred Cattle

“…Large genetic variation was also observed between the estimated breeding values of sires by Dalal et al (1999), Dubey et al (2006) in crossbred cattle, Banik and Gandhi (2006) in Sahiwal Cattle; Kumar et al (2008) on Karan fries cattle and Moges et al (2009), Singh and Singh (2011 and Dubey and Singh (2014) in crossbred cattle.…”

Isolation and screening of Lactobacillus species from dogs for probiotic action

“…CV was almost similar for BLUP-SM (22.89%) and BLUP-AM (21.35%) indicating that all these methods were almost equally stable. Banik and Gandhi (2006) however reported that the deviation of CV with respect to unadjusted data was lower in BLUP compared to LSQ indicating that BLUP method was more stable than LSQ.…”

“…Relative efficiency estimates were in agreement with the findings of Singh et al (2014) in Murrah buffalo. However, Banik and Gandhi (2006) in Sahiwal cattle reported the relative efficiency of BLUP in comparison to LSQ for 300-day milk yield to be 97%.…”