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Correlated responses to selection for intramuscular fat in several muscles in rabbits
Meat Science ( IF 5.7 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.meatsci.2018.01.026
Marina Martínez-Álvaro , Pilar Hernández , Saif Agha , Agustín Blasco

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.



中文翻译:

兔几种肌肉中肌内脂肪选择的相关反应

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。

更新日期:2018-02-01
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