Journal
JOURNAL OF APPLIED ANIMAL RESEARCH
Volume 46, Issue 1, Pages 791-797Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09712119.2017.1403918
Keywords
Daily milk yield; model; lactation curve; prediction
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2016CM37]
- China Agriculture Research System [CARS-36]
- Agricultural improved varieties project of Shandong Province [2016LZGC027]
- Agricultural scientific and technological innovation project of Shandong Academy of Agricultural Sciences [CXGC2016A04]
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This study compared six models, namely the Gaines, Sikka, Nelder, Wood, Dhanoa and Hayashi models, for the estimation of 305 days milk yield in Chinese Holstein cattle. We compared their ability to reliably predict 305-day lactation yield from incomplete (3 or 6 test-day (TD)) records. Our findings revealed that the accuracies (ACC) were 0.6655-0.9948, 0.8652-0.9977 and 0.9169-0.9968, whereas the mean square errors (MSE) were 0.0121-2.4807, 0.0139-1.0716 and 0.0170-0.5528 when 3 TD records were used in the first, second and higher lactations, respectively; when 6 TD records were used, the ACC were 0.8800-0.9992, 0.8742-0.9998 and 0.7950-0.9996, whereas the MSE values were 0.0017-0.3348, 0.0011- 0.8605 and 0.0021-1.4869 in the first, second and higher lactations, respectively. All the models were fitted more accurately with 6 TD than 3 TD records. Further analysis revealed that the curves made by the Nelder, Wood and Dhanoa models were close to the actual curves. These three models can be used to predict the 305-day yield for management decisions in farms and for the genetic evaluation of Chinese Holstein cattle.
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