The model parameters, fit statistics and prediction of lactation yield from test day records of different breed groups of Holstein-Friesian breed were estimated after fitting the Wood Model. The model parameters and fit statistics of different breed groups were varied. There was a significant different in between breed groups of Holstein-Friesian cows. According to R2, CV and RootMSE values the Holstein-Friesian (75%) x Local (25%) blood groups showed good fit of Wood model than other breed groups. The predicted highest lactation milk yield (1813.62) was observed for the cow which carries 75% of Holstein-Friesian. 1255776225.php