This study carried out parameter estimations of the lactation curve of 371 lactation records that were obtained from 176 Holstein Friesian cows in the period of 2004-2009 at the Kazova Vasfi Diren Agriculture Facilities using three different models (Wood, Cobby and Le Du and Wilmink). For this purpose, coefficient of determination (R2), mean squared error (MSE) and Durbin-Watson (dw) values were used to determine the best model. The highest coefficient of determination for the Wood model was found as 0.96 in the 3th lactation, while the mean squared error was found as 37,75. For the Cobby and Le Du model, the highest coefficient of determination value and mean squared error were found as 0.96 and 37,43 in the 3th lactations, respectively. For the Wilmink model, the highest coefficient of determination and the lowest mean squared error value were found as 0.45 and 40.49 respectively. In the study, it was determined that the Cobby and Le Du model with the minimum MSE, maximum R2 and minimum dw were the best models for estimating lactation curves for Holstein cattle at the Kazova Vasfi Diren Agriculture Facilities.
Primary Language | English |
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Journal Section | Research Articles |
Authors | |
Publication Date | August 31, 2019 |
Published in Issue | Year 2019 Volume: 36 Issue: 2 |