PDF(Pubmed)
Abstract：
The recessive T allele of the missense polymorphism rs709596309 C > T of the leptin receptor gene is associated with intramuscular fat. However, its overall impact on pork production is still partial. In this work, we investigated the all-round effects of the TT genotype on lean growth efficiency and carcass, meat and fat quality using data from an experiment that compared the performance of 48 TT and 48 C- (24 CT and 24 CC) Duroc barrows. The TT pigs were less efficient for lean growth than the C- pigs. Although heavier, their carcasses had less lean content, were shorter and had lighter loins. Apart from increasing marbling and saturated fatty acid content, changes caused by the TT genotype in meat and fat quality are likely not enough to be perceived by consumers. The effect on visual marbling score exceeded that on intramuscular fat content, which suggests a direct influence of the T allele on the pattern of fat distribution in muscle. With current low-protein diets, the T allele is expected to be cost-effective only in niche markets where a very high level of marbling is critical.
摘要：
瘦素受体基因错义多态性rs709596309C>T的隐性T等位基因与肌内脂肪有关。然而,它对猪肉生产的总体影响仍然是部分的。在这项工作中,我们研究了TT基因型对瘦肉生长效率和car体的全方位影响，使用来自实验的数据比较了48TT和48C-（24CT和24CC）Duroc手推车的性能。TT猪的瘦肉生长效率低于C猪。虽然更重,他们的尸体的瘦肉含量较低，更短，腰部更轻。除了增加大理石花纹和饱和脂肪酸含量外，由TT基因型引起的肉类和脂肪质量的变化可能不足以被消费者感知。对视觉大理石花纹评分的影响超过对肌内脂肪含量的影响，这表明T等位基因对肌肉中脂肪分布的模式有直接影响。目前的低蛋白饮食，预计T等位基因仅在非常高水平的大理石花纹至关重要的利基市场中具有成本效益。
