Comparison of sire evaluation methods for first lactation milk yield and lifetime traits in Sahiwal cattle

The least squares method (LSM), best linear unbiased prediction (BLUP) and animal model of derivative free restricted maximum likelihood (DFREML) were used to estimate breeding values (EBVs) of Sahiwal sires by analyzing first lactation and lifetime records of their daughters maintained at 3 differe...

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Bibliographic Details
Published in:Indian journal of animal sciences 2010-12, Vol.80 (12)
Main Authors: Kumar, Amit, Gandhi, R.S
Format: Article
Language:English
Subjects:
EVALUACION DE SEMENTALES
EVALUATION GENETIQUE DES PERES
http://www.fao.org/aos/agrovoc#c_15998
http://www.fao.org/aos/agrovoc#c_16038
MILK YIELD
RENDEMENT LAITIER
RENDIMIENTO LECHERO
SIRE EVALUATION
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Summary:The least squares method (LSM), best linear unbiased prediction (BLUP) and animal model of derivative free restricted maximum likelihood (DFREML) were used to estimate breeding values (EBVs) of Sahiwal sires by analyzing first lactation and lifetime records of their daughters maintained at 3 different farms. The highest overall average breeding value (1581.80 kg) for first lactation 305 days milk yield (FL305DMY) was obtained by BLUP method and the lowest breeding value (1522.53 kg) was obtained by least squares method. The average breeding value of Sahiwal sires for stayability were 2164.18, 1510.02 and 1927.45 days, respectively, using LSM, BLUP and DFREML methods of sire evaluation, whereas the average breeding value for lifetime milk yield (LTMY) were 9432.79, 6054.39 and 7437.27 kg, respectively, using 3 methods of sire evaluation. The derivative free restricted maximum likelihood (DFREML) method had the minimum error variance (16031.49 kg2) and was adjudged as the most efficient method of sire evaluation on the basis of FL305DMY. On the other hand, the least squares method (LSM) of sire evaluation had minimum error variances (5497332.00 kg2 and 181327.00 days2) for lifetime milk yield and stayability, and was found to be most efficient over other 2 methods of sire evaluation. The lowest range of breeding values for FL305DMY and stayability using sire model (BLUP) indicated that this method was least capable to discriminate amongst bulls to the highest extent in comparison to LSM and DFREML. Also the least squares method had highest R2 value hence most accurate for evaluating sires on the basis of lifetime traits. The daughters of sires selected for higher FL305DMY would tend to produce higher LTMY up to reasonable extent. However sires selected for higher breeding value for first lactation milk yield may not produce daughters with longer herd life.
ISSN:0367-8318