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Comparison of sire evaluation methods in Frieswal cattle at different military dairy farms of Maharashtra

Sumana Kundu; Shardindu Shil; Ashish C Patel; R. S. Joshi; S. G. Gajjar; P. Bali; D. N. Rank.

A total of 1456 lactation records of 420 daughters sired by 77 bulls from 1999-2014 collected from 3 Military Dairy Farms of Southern Command were analysed to compare various sire evaluation methods for Calving Interval in days (CI), Lactation Length in days (LL), Standard Lactation Period Yield in Kgs (SLPY). Least Squares method (LS), Best Linear Unbiased Prediction (BLUP) method and Average Information Restricted Maximum Likelihood (AIREML) method (both univariate and multivariate model) was used for Sire evaluation. Spearman’s rank correlations were estimated. Coefficients of determination and coefficients of variation were used to measure the accuracy and stability of models. The least squares means for CI, LL and SLPY were 443.81±20.41 Days, 329.91±11.56 and 3136.38±224.11 kg respectively. Most efficient model for CI was univariate BLUP as evident from error variance 2417.10 Day2.The most efficient model for LL was multivariate BLUP of CI-LL with error variance 1001.43Day2. The most efficient model for SLPY was univariate AIREML with error variance 118173 Kg2.

Key words: MDF;Sire Evaluation;AIREML;Estimated Breeding Value;CI;LL;SLPY

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American Journal of Diagnostic Imaging


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