Animal and Veterinary Science Group, Scotland's Rural College (SRUC), Edinburgh, UK.
Meat Sci. 2013 Sep;95(1):129-36. doi: 10.1016/j.meatsci.2013.04.038. Epub 2013 Apr 23.
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.
研究了在生长育肥期（40-115kg）用不同蛋白和氨基酸水平的饲粮饲养猪对组成变化的影响，采用 CT 扫描（60、85 和 115kg 活体体重时）。用商业对照饲粮（C）、高蛋白低蛋白饲粮（LP1 和 LP2）、净能平衡，对瘦肉型商业基因型猪进行饲养。活体 CT 测量与屠宰后样品关节解剖结果对胴体组织重量/比例的结果非常吻合，CT 测量的肌肉密度准确预测了肌内脂肪。在生长过程中，C 和 LP1 饲粮处理的猪在组成上没有显著差异。然而，从 85kg 开始，LP2 饲粮处理的猪的脂肪（胴体、内部和肌内脂肪）显著增加，肌肉减少。尽管脂肪水平取决于饲粮处理（LP2>其他），但不同体脂库的脂肪比例不受影响。
