Estimation of 305-day milk yield from test-day records of Chinese Holstein cattle
| Autor: | Minghai Hou, Zhao Xiuxin, Ya-bin Ma, Jin-ming Huang, Jianbin Li, Rongling Li, Shao-hua Sun, Zhong Jifeng, Zhihua Ju, Ling-na Kong |
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| Rok vydání: | 2017 |
| Předmět: |
Estimation
model lcsh:Veterinary medicine Holstein Cattle General Veterinary 040301 veterinary sciences 0402 animal and dairy science prediction 04 agricultural and veterinary sciences Biology 040201 dairy & animal science 0403 veterinary science Daily milk yield Milk yield Animal science Test day lcsh:SF600-1100 Animal Science and Zoology lactation curve |
| Zdroj: | Journal of Applied Animal Research, Vol 46, Iss 1, Pp 791-797 (2018) |
| ISSN: | 0974-1844 0971-2119 |
| DOI: | 10.1080/09712119.2017.1403918 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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