The test interval for TIM is the period immediatelyafter a test day through the following test day and iscomposed of two equal parts (2). Production creditsfor the first half of the test period are assumed to bethe same as the earlier test day yield, and credits forthe last half are assumed to be the same as the latertest day yield. For first and last test intervals, yieldcredits are calculated the same as for the centeringdate method. During the 1970s, TIM was improved byadjusting credits for the first and second test inter-vals for the nonlinear shape of the lactation curve andby adjusting the last test for a continuation of theexpected decline (11). Those adjustments eliminatedbiases from overestimation of the credits for first andlast test intervals and from an underestimation of thecredits for the second test interval.
Comparison of Test Interval and Best Prediction Methods for Estimation of Lactation Yield from Monthly, a.m.–p.m., and Trimonthly Testing (PDF Download Available). Available from: https://www.researchgate.net/publication/13221765_Comparison_of_Test_Interval_and_Best_Prediction_Methods_for_Estimation_of_Lactation_Yield_from_Monthly_am-pm_and_Trimonthly_Testing [accessed May 8, 2016].
The test interval for TIM is the period immediatelyafter a test day through the following test day and iscomposed of two equal parts (2). Production creditsfor the first half of the test period are assumed to bethe same as the earlier test day yield, and credits forthe last half are assumed to be the same as the latertest day yield. For first and last test intervals, yieldcredits are calculated the same as for the centeringdate method. During the 1970s, TIM was improved byadjusting credits for the first and second test inter-vals for the nonlinear shape of the lactation curve andby adjusting the last test for a continuation of theexpected decline (11). Those adjustments eliminatedbiases from overestimation of the credits for first andlast test intervals and from an underestimation of thecredits for the second test interval. Comparison of Test Interval and Best Prediction Methods for Estimation of Lactation Yield from Monthly, a.m.–p.m., and Trimonthly Testing (PDF Download Available). Available from: https://www.researchgate.net/publication/13221765_Comparison_of_Test_Interval_and_Best_Prediction_Methods_for_Estimation_of_Lactation_Yield_from_Monthly_am-pm_and_Trimonthly_Testing [accessed May 8, 2016].
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