饲粮蛋白水平对肥育猪不同部位肌纤维发育增生的影响

Effect of diet protein level on muscle fiber hypertrophy of different part in the finishing pigs

试验比较研究了接近等氨基酸模式下,饲粮蛋白水平对肥育猪不同部位肌肉肌纤维发育增生的影响。饲粮蛋白水平分别为10%、18%、26%,试验选用平均体重约53kg的长×大二元杂交去势公猪54头。试验采用单因子完全随机区组设计,随机分为3个处理,每个处理3个重复(圈),每个重复6头猪,在接近等氨基酸模式TD-Lys:TD-Met:TD-Thr:TD-Trp=100:34.6:71.7:19.2,且在等能(14.2MJ/kg)条件下进行试验。采用石蜡切片方法,测定了肥育猪肌纤维横截面积、直径与密度,探讨在接近等氨基酸模式下饲粮蛋白水平对肥育猪肌纤维发育增生的影响。结果表明,通过提高饲粮蛋白质水平,进而提高动物体蛋白质的沉积效率,机体蛋白质含量的增加导致不同部位肌纤维横截面积和直径增大,即肌纤维体积增大,随着肌纤维的增粗,导致单位面积内肌纤维密度下降。

The experiment study the effect of diet protein level at the ideal balance amino acid pattern on muscle fiber hypertrophy of different part in the finishing pigs. Adopting wholly random design, fiftyfour about 53 kg （Larger WhitexLandrace） dual hybrid castrated boar, which are divided into three treatments, each treatment including three replicated （six pigs per replicated）, and fed with diets of three protein levels （10%, 18%, 26%） respectively. The energy concentration and amino acid pattern in the three diets were kept same. Adopting paraffins ection,the morphological quantity parameters are deteeted. In conclusion, the diet protein level may improve the deposit degree of protein in the body of animal. The morphological quantity parameters at the different part muscle fiber is increased with amount of the protein in the body, that is to say, the volum of muscle fiber is growing; The amount of connective tissue and adipose tissue is increased with the thickening muscle fiber, the muscle fiber density is cut down.