Abstract

Data from 27 crosses of mice (430 matings) were utilized to evaluate the importance of certain biological traits associated with reproduction of parents and postweaning growth and carcass c o m p o s i t i o n of progeny on economic conversion (ECN; expenses/income). The traits studied were reproductive rate (RRT), weight per pup born alive (WPP), parental feed consumption per day (FPD), age of parents at termination of reproduction (AGE), progeny postweaning average daily gain (ADG), progeny postweaning feed conversion (FCN), progeny postweaning survival (PWS), and carcass protein yield (PYD). Standard partial regression coefficients of ECN on the above 8 traits were estimated; the 8 traits accounted for 92? of the variation in ECN. The characters were negatively associated with ECN, showing that increased production contributes to minimizing ECN. Traits associated with increased cost and/or time of measurement (FPD,ADG,FCN,PYD) might be dropped from the phenotypic production function without loss of accuracy in predicting ECN.
 

S. Newman, D. L Harris, D. P Doolittle

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 309–314, 1986
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