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- Title
EVALUATION OF RATHI SIRES BY DIFFERENT METHODS FOR MILK YIELD PER DAY OF FIRST LACTATION LENGTH.
- Authors
Nehra, K. S.; Joshi, R. K.; Sain, M.; Singh, Dharmveer; Kumar, Pradeep
- Abstract
The least-square (LS), simplified regressed least-squares (SRLS), Best linear unbiased prediction for breeding values (BLUPI) and Best linear unbiased prediction for expected breeding values (BLUP-II) methods were used to estimate the breeding values of 27 Rathi sires for milk yield per day of first lactation length (MY/FLL) from performance records of 281 daughters calving during 1978 to 2000 at Livestock Research Station, Nohar and Bikaner of Rajasthan Agricultural University, Bikaner, Rajasthan. Model for LS included fixed effect of sire, farm, period and season of birth ignoring the sire group effect. Model for BLUP included fixed effect of farm, period, season of birth and sire group as fixed effects and sires within sire group as a random effect. The highest range of breeding value (1171.25 litres) was estimated by LS method while lowest range of breeding value (201.38 litres) was observed by BLUP II method. The LS method is not suitable for evaluating the sires with lesser number of progenies per sire. BLUP indicates the real transmitting ability of a bull and is therefore a better estimate of the breeding worth of a bull. The estimates of rank correlation between BLUP-II and BLUP-I was 0.99 indicated that these methods were more or less similar in ranking the sires for their merit. However, better predictability of BLUP-II method could be concluded while appraising the genetic merit of Rathi sires.
- Subjects
MILK yield; LACTATION in cattle; LACTATION; EXPECTED returns
- Publication
Veterinary Practitioner, 2019, Vol 20, Issue 1, p118
- ISSN
0972-4036
- Publication type
Article