Zeng Qing-Yong, Wang Gen-Lin, Wei Shu-Dong, Wang Lin-Yun, Yang Hai-Ling, Cao Hong-Fang, Xu Yun-Hua
College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
Yi Chuan. 2005 Jan;27(1):65-9.
Sixty pigs, including pure Laiwu Black (LL), pure Large Yorkshire (YY), 1/2 Laiwu (Ymale x Lfemale), 3/4 Laiwu (Lmale x YLfemale) and 1/4 Laiwu (Ymale x YLfemale), were housed in groups with the same diet until 90 kg for slaughter. The objectives were to investigate the effects of graded proportions of Laiwu Black genes on carcass and meat quality performance. Results indicated that different consanguinity had significant effect on carcass weight, carcass length (CL), ham percentage (HP) and backfat thickness (BT) (P<0.05), and had highly significant effect on eye muscle area (EMA) and lean percentage (LP) (P<0.01). Furthermore, CL, HP, EMA and LP tended to increased gradually, but BT tended to decreased gradually as Laiwu Black genes decreased. For meat quality properties, different consanguinity had significant effect on meat color, marbling score, dry matter and crude protein content of muscles (P<0.05), and had highly significant effect on water loss, drip loss and intramuscular fat content of muscles (P<0.01). Compared with the muscle of Large Yorkshire, that of Laiwu Black and its crossbred pigs were bright red in meat color, high in water holding capacity and abundant in intramuscular fat. Results implied that to give attention to both quantity and quality, Laiwu Black surely has usable precious value in superior pig production. Commercial crossbred pigs should have about 1/4 of Laiwu Black genes.
60头猪，包括纯种莱芜黑猪（LL）、纯种大约克夏猪（YY）、1/2莱芜黑猪（约克夏公猪×莱芜黑母猪）、3/4莱芜黑猪（莱芜黑公猪×1/2莱芜黑母猪）和1/4莱芜黑猪（约克夏公猪×1/2莱芜黑母猪），按组饲养，给予相同日粮，直至体重达90千克时屠宰。目的是研究莱芜黑猪基因的不同比例对胴体和肉质性能的影响。结果表明，不同血缘对胴体重、胴体长（CL）、后腿比例（HP）和背膘厚（BT）有显著影响（P<0.05），对眼肌面积（EMA）和瘦肉率（LP）有极显著影响（P<0.01）。此外，随着莱芜黑猪基因比例的降低，CL、HP、EMA和LP呈逐渐增加趋势，而BT呈逐渐降低趋势。对于肉质特性，不同血缘对肌肉的肉色、大理石花纹评分、干物质和粗蛋白含量有显著影响（P<0.05），对肌肉的失水率、滴水损失和肌内脂肪含量有极显著影响（P<0.01）。与大约克夏猪的肌肉相比，莱芜黑猪及其杂交猪的肌肉肉色呈鲜红色，持水力高，肌内脂肪丰富。结果表明，要兼顾数量和质量，莱芜黑猪在优质猪生产中确实具有可利用的宝贵价值。商品杂交猪应含有约1/4的莱芜黑猪基因。
