PREDICTION OF LACTATION MILK YIELDS FROM TEST DAY RECORDS

Abstract

The model parameters, fit statistics and prediction of lactation yield from test day records of different blood groups of Holstein-Friesian cows were estimated after fitting the incomplete gamma equation (Wood Model). The model parameters and fit statistics of different blood groups were varied. There was a significant different in between blood groups of Holstein-Friesian cows. According to R2 and Root MSE values the H (50%) S (50%) blood groups are more fitted with Wood model than other blood groups. The predicted highest lactation milk yield (1659.92) was observed for the cow (H-75%× S-25%). The figures indicated that the H(75%) × S(25%) and H(67%)x S(32%)x L(1%) blood groups of cows were provided the shape of lactation cures and other blood groups showed slightly different.