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.

这项研究的目的是评估在9周时六代选择肌肉中的Longissimus thoracis et lumborum（LTL）肌内脂肪（IMF）的效果。IMF和肌肉中脂肪酸（FA）成分的变化，这些代谢具有不同的代谢特性。对选择的直接响应是0.33 g IMF / 100 g LTL，每代约0.4 SD。在IMF中观察到阳性相关的响应股二头肌，冈上肌和半膜proprius9 wk的肌肉，每代代表该性状的约0.2 SD。选择对9 wk的所有肌肉的FA成分的影响相似，高IMF线比低IMF线显示更高的单不饱和度但更低的多不饱和FA百分数，而饱和FA则没有观察到差异。还测量了13周的性状。和相关的反应是朝着相同的方向。我们的结果表明，兔子体内具有不同代谢特征的肌肉中IMF和FA组成的共同遗传背景。