Analysis of Holstein Dairy Cows Fitting Lactation Curve in Xinjiang Changji Area |
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| Authors: | LIU Li-yuan ZANG Chang-jiang ZHOU Jing-hang CHEN Bao-ping GAO Pan HUANG Xi-xia ZHONG Hai-jiao |
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| Institution: | 1. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;2. Xinjiang Lang Qing Animal Husbandry Co., Ltd., Changji 831100, China |
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| Abstract: | In this study,the statistical analysis data of 185 340 Holstein dairy cows daily yield records were collected from 2011 to 2014 years in Changji area of Xinjiang,five kinds of models (Wood,IQP,Wilmink,ML,AS models) were used for the first,second,third,fourth and all parities fitting lactation curve.The results showed that the Wood,IQP,Wilmink,ML,AS models fitting precision were within the range from 0.9562 to 0.9828,0.9467 to 0.9809,0.8671 to 0.9752,0.8752 to 0.9175,0.8775 to 0.9127;Milmink model was the best fitting model for the first parity lactation curve,Wood model was the best fitting model for the second,third,and fourth parities lactation curve. |
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| Keywords: | Holstein dairy cows lactation curve goodness of fit |
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