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Extension Section

E1. New developments in production testing. F. N. Dickinson, Animal Husbandry Research Division, USDA, Beltsville, Maryland.

A technical subcommittee of the National DHIA Coordinating Group has been formed to coordinate research on testing plans and methods for estimating yield. The committee decided that major problems facing it were estimation of milk and milk fat yield under alternate AM-PM sampling plans; adjustment of lactation milk and milk fat yields at start and end of lactation under TIM; parameters of daily milk fat variation; definition of acceptable tolerances for errors in estimates of yield, and; modifications to standard DHI rules to make them compatible with TIM. The last problem is the only one that has been mostly resolved. Progress has been made towards solving the other problems for lactation milk yield. Little progress has been made on any of the problems of milk fat yield or the errors found in, or acceptable tolerances for, periodic milk weights. Data are available for studies on milk. Data must be collected for studies on milk fat.