Effect of energy and protein restriction during nursing period on intramuscular fat accumulation of longissimus dorsi muscle of pigs

本试验旨在研究哺乳期限制能量和蛋白质对猪肌内脂肪（IMF）积累的影响。哺乳期间能量和蛋白质的限制导致肌肉发育受到抑制，这种抑制导致蛋白质降解增加，蛋白质合成减少，肌肉中总胶原含量增加，但对IMF没有影响。而胶原蛋白和脂质代谢相关基因的mRNA水平没有变化。由此可见，哺乳期限饲对肌肉发育有抑制作用，但对肌内胶原类型和IMF合成无影响。

This experiment was conducted to determine the effect of energy and protein restriction during nursing period on intramuscular fat(IMF) accumulation of pigs. The restriction of energy and protein during the nursing period in pigs resulted in suppression of muscle development and this suppression was responsible for increased protein degradation and decreased protein synthesis, and increased total collagen contents in muscle, but no difference of IMF. While mRNA levels of collagen and lipid metabolism related genes were not changed. It was suggested that the feed restriction during nursing period resulted in suppression of muscle development, but no difference of intramuscular collagen type and IMF synthesis.