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Article10.2527/1990.6841034x

THE ILLINOIS SPRING BARROW SHOW: CARCASS TRENDS FROM 1968 TO 1989 AND USE OF CARCASS CHARACTERISTICS TO PREDICT DRESSING PERCENTAGE

Donald G. McLaren,F. K. McKeith,Tom Carr,Jan Novakofski-1990-04-01-Journal of Animal Science
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Abstract The Illinois Spring Barrow Show, a large annual carcass show of performance-tested pigs, may provide an indication of phenotypic trends in the pork industry over time. Objectives of this study were 1) to investigate time trends in live and carcass weights (LWT, CWT), dressing percentage (DP), length (LEN), loin muscle area (LEA), backfat (BF), muscle color, firmness and marbling (C,F,M) scores, estimated fat-standardized lean yield (FSL), FSL/d of age (LDOA) and FSL/d on test (LDOT) and 2) to assess use of carcass characteristics to predict DP. Data on 5,983 barrows exhibited between 1968 and 1989 were analyzed. Linear regressions expressed as change/yr (1977 to 1989, all P < .001) were .56 kg (LWT), .53 kg (CWT), .11 % (DP), .50 mm (10th rib BF), −49 g (wt-adj. FSL), 2.0 g (wt-adj. LDOA, 1977 to 1983) and −2.2 g (wt-adj. LDOT, 1984 to 1989). There were only small changes in LEN, C, F and M. Between 1968 and 1976, LEA increased .42 cm2/yr, then decreased .23 cm2/yr until 19

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Abstract The Illinois Spring Barrow Show, a large annual carcass show of performance-tested pigs, may provide an indication of phenotypic trends in the pork industry over time. Objectives of this study were 1) to investigate time trends in live and carcass weights (LWT, CWT), dressing percentage (DP), length (LEN), loin muscle area (LEA), backfat (BF), muscle color, firmness and marbling (C,F,M) scores, estimated fat-standardized lean yield (FSL), FSL/d of age (LDOA) and FSL/d on test (LDOT) and 2) to assess use of carcass characteristics to predict DP. Data on 5,983 barrows exhibited between 1968 and 1989 were analyzed. Linear regressions expressed as change/yr (1977 to 1989, all P < .001) were .56 kg (LWT), .53 kg (CWT), .11 % (DP), .50 mm (10th rib BF), −49 g (wt-adj. FSL), 2.0 g (wt-adj. LDOA, 1977 to 1983) and −2.2 g (wt-adj. LDOT, 1984 to 1989). There were only small changes in LEN, C, F and M. Between 1968 and 1976, LEA increased .42 cm2/yr, then decreased .23 cm2/yr until 19

Keywords

LoinMarbled meatAnimal scienceCarcass weightMathematicsBreedLean meatBiology

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