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Research Article Open Access
The data spread over the period of 25 years for the present study. Data were obtained from the history sheets of 1312 Murrah buffaloes maintained at four military dairy farms of northern India viz. Ambala, Agra, Lucknow and Bareilly. The sires were evaluated for WFC, AFC, FDP, FCI, FSP, FLMY, HLMY and FLP traits. The sires have been evaluated and ranked on the basis of solutions obtained through univariate and multivariate REML using animal model and BLUP value for sire effects under model 8. Less than half of the sires were superior to the population mean under BLUP1, BLUP2 and BLUP3. The superiority of the best sire (as per cent of the raw mean) were 8 % for the reproduction traits under BLUP1 but above 15% under BLUP2 and around 10% under BLUP3, for FLMY and HLMY, this superiority was around 11, 7 and 9% respectively. The responding values under BLUP1, were 19, 15 and 15% under BLUP2, 18, 14 and 6% under BLUP3. It was observed that top ranking sire for AFC (i.e. M-140) was same under BLUP1, BLUP2 and BLUP3 for FLMY (i.e. M-143) was same in BLUP 1 and BLUP2. In BLUP2 and BLUP3, around 50% animals were superior to the population mean for reproduction and production traits. The superiority of the best animal (as per cent of the raw means was above 13% under BLUP2 and BLUP3) for reproduction traits except WFC. But there values were 31, 18 and 21% (BLUP2) and 33, 23 and 25% (BLUP3) for FLMY, HLMY and FLP respectively. Rank correlation under different methods were highly significant and ranged from 0.697 (between model 8 and multivariate animal model for first lactation period) to 0.999 (between model 8 and unuvariate animal model for first service period). Rank correlations were above 0.973 for all the traits when sires were ranked by model 8 and univariate animal model. The rank correlations among methods with in traits were though highly significant (P<0.01), yet not perfect, revealed that the ranking of sires by different methods were not similar. The rank correlations among traits within method were low than among methods within traits within the method. From these results, it was observed that the range of sire effect, per cent sire superior to population mean and superiority of best sire/animal was more under BLUP1 and BLUP3 than BLUP1. Therefore, REML using animal model could be used to evaluate the animals along with their sires and dams.
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Author(s): T.B.Yadav and C.V.Singh
Sire evaluation, Rank correlation, animal model, best linear unbiased prediction., Animal model, unbiased prediction