Department of Animal Science, University of Lleida - Agrotecnio-CERCA Center, 191 Rovira Roure, 25198, Lleida, Catalonia, Spain.
Selección Batallé S.A., 17421, Riudarenes, Catalonia, Spain.
Sci Rep. 2024 May 9;14(1):10652. doi: 10.1038/s41598-024-61509-1.
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.
瘦素受体基因错义多态性 rs709596309 C>T 中的隐性 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局部的。在这项工作中，我们使用来自一项比较 48 头 TT 和 48 头 C-（24 CT 和 24 CC）杜洛克公猪性能的实验数据，研究了 TT 基因型对瘦肉生长效率和胴体、肉质和脂肪质量的全面影响。TT 猪比 C-猪在瘦肉生长方面效率较低。尽管它们更重，但它们的胴体瘦肉含量较少，更短，腰肉更轻。除了增加大理石花纹和饱和脂肪酸含量外，TT 基因型引起的肉质和脂肪质量变化可能不足以被消费者察觉。对视觉大理石花纹评分的影响超过了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模式有直接影响。在目前的低蛋白饮食中，只有在非常高的大理石花纹水平至关重要的利基市场，T 等位基因才有望具有成本效益。
