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Comparing accuracy of KAIA factors with USDA factors for adjusting test-interval milk yields



Comparing accuracy of KAIA factors with USDA factors for adjusting test-interval milk yields



Korean Journal of Animal Science 35(2): 99-106



The purpose of this research was to compare accuracy of Korea Animal Improvement Associations (KAIA) factors with USDA factors for adjusting test-interval milk (TIM) yields. Data used in this analysis were 721 lactation records with 305 daily milk yields. When test-interval yields adjusted by KAIA factors and by USDA factors were compared with actual yields, by stage of lactation, USDA factors could reduce bias of TIM yields from actual yields more effectively than KAIA factors all in the first, second, and last test intervals. When test days of individual record were randomly chosen at 26 to 34 day intervals, bias of TIM yields from actual yield was largest in the first test interval(78.5kg for first lactation and 94.0kg for later lactations), the second test interval(-20.0kg and -22.6kg), and the interval after last ten-day(10.9kg and 15.0kg). The bias wasn't reduced reasonably in the TIM yields adjusted by KAIA factors in any test interval whereas the amount of bias in the yields adjusted by USDA factors was reduced effectively in all the three test intervals. Sampling errors of test interval yields adjusted by USDA factors were equal to or smaller than ones adjusted by KAIA factors.

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