【摘要】 研究了饲粮蛋白水平对肥育猪不同部位肌纤维发育增生的影响。采用完全随机区组设计,54头53kg的大×长生长猪随机分为3个处理(每处理3重复),饲喂等氨基酸(TDLys∶TDMet∶TDThr∶TDTrp=100∶34.6∶71.7∶19.2),等消化能(DE 3200kcal.kg-1),不同蛋白水平(CP 10%、18%和26%)的3种饲粮,饲喂期67d之后屠宰采样,测背最长肌、腰大肌、半腱肌、半膜肌、臂三头肌、臀中肌的肌纤维间距、肌束间距和肌大束间距。结果表明:饲粮蛋白水平不同,肌纤维各性状指标也不同。肌纤维间距、肌束间距均与饲粮蛋白水平呈正相关(p<0.01),而肌大束间距与饲粮蛋白水平呈负相关(p<0.01)。饲粮蛋白水平与肌肉部位均影响肥育猪肌纤维的发育增生,二者间存在交互作用(p<0.01)。随着肌纤维的增粗,肌大束间距下降。更多还原

【Abstract】 The experiment comparatively studied the effect of diet protein level on different muscle fiber hypertrophy in finishing pigs.According to a completely randomized block design,54 growing pigs(Larger×Landrace) with an average weight of 53kg were assigned to three treatments(with three replicates per treatment).The diets contained a same amino acid pattern(TDLys∶ TDMet∶TDThr∶TDTrp=100∶34.6∶71.7∶19.2) and a same digestibile energy level(DE 3200 kcal/kg) with different crude protein levels(CP 10%,18% and 26% respectively).The trial lasted for 67 days before slaughter and longissimus dorsi(LD),psoas major(PM),semaitendinosus(ST),semimembranosus(SM),arm triceps(AT),glutaeus medius(GM) muscle samples were taken to measure the great muscle bundle distance,muscle fiber distance and muscle bundle distance.There was a positive correlation between muscle fiber distance,muscle bundles distance and protein level(p<0.01),a negative correlation between great muscle bundles and protein level(p<0.01).The diet protein level and the different muscle all influenced muscle fiber hypertrophy in the finishing pigs,and there was an interaction between them(p<0.01).With muscle thickening,there were increases in connective tissue and adipose tissue between muscle,leading to descend of muscle fiber density and distance between great muscle bundles.更多还原