Institute for Animal Science and Technology, Universitat Politècnica de València, 46022 València, Spain.
Institute for Animal Science and Technology, Universitat Politècnica de València, 46022 València, Spain.
Meat Sci. 2018 May;139:187-191. doi: 10.1016/j.meatsci.2018.01.026. Epub 2018 Feb 1.
The aim of this study was to evaluate the effect of six generations of selection for intramuscular fat (IMF) in muscle Longissimus thoracis et lumborum (LTL) at 9 wk. in IMF and fatty acid (FA) composition of muscles with diverse metabolic profile in rabbits. Direct response to selection was 0.33 g of IMF/ 100 g of LTL, around 0.4 SD per generation. A positive correlated response was observed in IMF of Biceps femoris, Supraspinatus and Semimembranosus proprius muscles at 9 wk., representing around 0.2 SD of the trait per generation. Selection affected similarly the FA composition of all muscles at 9 wk., high-IMF line showing greater monounsaturated but lower polyunsaturated FA percentages than low-IMF line, whereas no differences were observed for saturated FA. Traits were also measured at 13 wk. and correlated responses were in the same direction. Our results suggest a common genetic background for IMF and FA composition in muscles with different metabolic profile in rabbits.
本研究旨在评估在 9 周龄时对肌肉 Longissimus thoracis et lumborum（LTL）中的肌内脂肪（IMF）进行六代选择的效果，以及不同代谢谱肌肉中 IMF 和脂肪酸（FA）组成的影响。对选择的直接反应是每 100 克 LTL 中有 0.33 克 IMF，每代约为 0.4 个标准差。在 9 周龄时，Biceps femoris、Supraspinatus 和 Semimembranosus proprius 肌肉中的 IMF 观察到正相关反应，每代代表约 0.2 个标准差的性状。选择对所有肌肉的 FA 组成的影响相似，高 IMF 品系的单不饱和脂肪酸百分比较高，多不饱和脂肪酸百分比较低，而饱和脂肪酸则没有差异。在 13 周龄时也测量了性状，相关反应方向相同。我们的结果表明，在不同代谢谱的肌肉中，IMF 和 FA 组成具有共同的遗传背景。
