ALTERNATIVE PORK CARCASS EVALUATION TECHNIQUES .2. STATISTICAL-ANALYSIS OF ERROR ATTRIBUTABLE TO SEX, GENOTYPE, AND WEIGHT

Carcasses of 154 hogs representing seven genotypes with substantial va riation in carcass composition and percentage of lean were completely dissected and analyzed. Measurements from a ruler, Hennessy probe, and electromagnetic scanner were each used to predict wholesale and lean boneless carcass value. Error, defined as dissected value minus predic ted value, due to the omission of sex, genotype, weight, and their int eractions was estimated for each model. The errors were significantly different from zero for the models using ruler and electromagnetic sca nning measurements separately (P <.01). Errors due to sex, genotype, w eight, and their interactions were greatest for the less lean barrows. A combination of probe and electromagnetic scanner measurements resul ted in the least error. The value of barrows with low percentage of le an was consistently overpredicted, whereas the value of leaner gilts w as underpredicted for the models using ruler and electromagnetic scann ing separately (P < .001).