Comparison of test-day and lactation models of sire evaluation in Murrah buffalo

VIJAY KUMAR; A K CHAKRAVARTY; C S PATIL; JAMUNA VALSALAN; ATUL MAHAJAN; PUSHP RAJ SHIVAHRE

doi:10.56093/ijans.v84i9.43652

Authors

VIJAY KUMAR Pt. Deen Dayal Upadhyaya Veterinary University, Mathura, Uttar Pradesh
A K CHAKRAVARTY National Dairy Research Institute, Karnal, Haryana 132 001 India
C S PATIL National Dairy Research Institute, Karnal, Haryana 132 001 India
JAMUNA VALSALAN National Dairy Research Institute, Karnal, Haryana 132 001 India
ATUL MAHAJAN National Dairy Research Institute, Karnal, Haryana 132 001 India
PUSHP RAJ SHIVAHRE National Dairy Research Institute, Karnal, Haryana 132 001 India

https://doi.org/10.56093/ijans.v84i9.43652

Keywords:

Best linear unbiased prediction, Lactation model, Murrah buffalo, Test-day model

Abstract

The aim of the study was to investigate efficiency of test-day model (TDM) compared to lactation model (LM) for genetic evaluation of Murrah buffalo bulls. Use of TDM instead of LM is of more interest in genetic evaluation because of variability of lactation days in dairy animals. Data pertaining to first lactation monthly test-day milk yield (FLMTDMY) and first lactation 305-days or less milk yield (FL305DMY) of 1,105 Murrah buffalo during 1993 to 2010 were collected and adjusted against significant environmental influences. It was found that test-day 6 milk yield (FLMTD6MY) had the highest genetic and phenotypic correlation with FL305DMY. An attempt is being made in the present investigation to compare the estimated breeding values (EBVs) of Murrah bulls through best linear unbiased prediction for FL305DMY and FLMTD6MY. The rank correlations between 2 traits were highly statistically significant indicating that FLMTD6MY is equally effective to discriminate amongst sires.

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