The data for present study were obtained from J.N.K.V.V. Dairy Farm Jabalpur. A total of 300 lactation records of 121 crossbred cows for the period of 6 years (1990-95) were used.The ratio method were used to predict 300 days yield from the milk samples collected at 4 weekly interval. Average error were found below 0.5% in predicted yield. Absolute error percentage were smallest(4.9%) in combination of 11 T.D. yield & were below 10% in estimates where at least 6 test records were used. Similarly correlation coefficient were found maximum (0.97) at II T.D. and above 0.8 starting from 6 T. D. suggest that Ready Recokner (ratio Factors) of predicting 300 days production starting from 6 or more T.D. can guide safely in predicting yield. 

R. Vinze, H. KB Parekh

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 467–470, 1998
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