Estimation of 305 Days Milk Yield Using Partial Milk Yield in Holstein Cattle

In this study, estimation of 305 days milk yield of Holstein cows raised in a Private enterprise of Karapinar district of Konya Province using their partial lactation records was aimed. A total of 105 first lactation records were used as the research of the study. 305 day milk yield was found to be 5997 +/- 107.95 liters. Estimated milk yields by Holland methods and partial lactation records (30, 61, 91, 122, 152, 183, 213, 244 and 274) day were changed between 5788 +/- 92.42 and 6198 +/- 118.38, the difference between them was statistically insignificant (P>0.05). Average lactation length and actual milk yield were 312 +/- 4.37 and 6369 +/- 149, respectively. By the way, there were statistically significant and higher correlation coefficients among actual 305 days milk yield, estimated milk yields by Holland methods and milk yields estimated by partial lactation records as 0.681-0.984 and 0.701-0.979, respectively (P<0.01). At the end of the study, it was stated that the 305 days milk yield could be estimated easily by using the first 30 days lactation records.