Estimates from BP methods and TIM were com-pared with actual milk yields for a wide range of milk recording frequencies to determine which method wasmore accurate for estimating lactation yield. Meas-ures of accuracy were correlations between actual andestimated yields and standard deviations of differ-ences between actual and estimated yields. Of partic-ular interest was the determination of the accuracy ofthe methods for test plans in which milk weights orcomponent samples were not collected on each milk-ing on the test day or were recorded less frequentlythan once per month. This study included testingenvironments for cows on 1) traditional monthly( MN) testing (i.e., herds for which milk weights aretaken approximately 1 d/mo), 2) a.m.–p.m. ( AP)testing (i.e., herds for which only one of the two milkweights is recorded on the monthly test date), and 3)trimonthly ( TRI) testing (i.e., herds for whichweights are taken 1 d every 3 mo). The estimatesfrom the TIM and BP methods were compared withtwo measures of actual milk yield within each testingenvironment
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].