Abstract
Abstract The breeding goal or objective for within-breed genetic improvement of pigs is defined here as increasing $ net income/kg carcass. The important animal traits which contributed to genetic differences in this objective are defined as feed conversion ratio (FCR), carcass grading profile (FAT), average daily gain (ADG), and carcass weight (CW). These traits were assigned values (conventionally called economic values) according to their potential contribution to variability in the objective (H). The four traits were combined non-linearly as follows: The potential variability available was indicated by σH which, from current New Zealand data, had a value of $0.041/kg carcass (=$2.47 per pig). Four linear selection indices were used as predictors of H, and they consisted of combinations of easily obtainable measurements. The most accurate selection index considered was a combination of measurements of FCR, three separate fat depths, and ADG, and had correlation with H of 0.665. Using this index the ran...
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