Journal
MEAT SCIENCE
Volume 95, Issue 1, Pages 129-136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2013.04.038
Keywords
Pig; Carcass composition; CT scanning; Fat; Diet
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The effects on compositional changes across the growing-finishing period (40-115 kg) of feeding pig diets with different protein and amino acid levels were investigated using CT scanning (at 60, 85 and 115 kg live weight). Pigs of a lean commercial genotype were fed a commercial control regime (C), or a low protein regime with either high (LP1) or low (LP2) essential amino acid levels, all balanced for net energy. In vivo CT measurements agreed well with post-slaughter. sample joint dissection results for carcass tissue weights/proportions, and CT-measured muscle density predicted intramuscular fat accurately. Pigs on C and LP1 regimes did not differ significantly in composition during growth. However, pigs on the LP2 regime had significantly more fat (in carcass, internal and intra-muscular depots) and less muscle, from 85 kg onwards. Although fat levels differed depending on diet regime (LP2 > others), proportions of fat in different body depots were unaffected. (c) 2013 Elsevier Ltd. All rights reserved.
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