分别选取来自安徽大明牧业牛场的18、36、54、72月龄西门塔尔杂交公牛各6头，在同一商业屠宰场进行屠宰。测定其背最长肌肌纤维直径、羟脯氨酸含量和剪切力。结果表明：背最长肌剪切力随着肌纤维直径的增大而增大，随着羟脯氨酸含量的增加而增大；背最长肌剪切力与肌纤维直径、羟脯氨酸含量有较高的相关性；剪切力与肌纤维直径和羟脯氨酸含量的相关系数，分别为0．833和0．835，为强正相关；建立的剪切力与肌纤维直径的指数回归方程为Y=1．162e^0.034x，R^2=0．932，说明回归方程拟合较好；建立的剪切力与羟脯氨酸含量的指数回归方程为Y=1．793e^27.430x,R^2=0．947，说明回归方程拟合较好。%Totally, 24 Simrnental hybrid bulls at 18, 36, 54 and 72 months of age （6 for each age） were selected from the cattle farm of Anhui Da Ming company. The cattle were slaughtered and processed in a commercial plant. Fiber diameter, hydroxypro- line content and shear force valueof the longissimus dorsi （LD） muscle were measured. The results showed that the shear force of LD muscle increased with the increase of fiber diameter and hydroxyproline content. The shear force was highly correlated with fiber diameter and hydroxyproline content, with r values of 0.833 and 0.835, respectively. The relationship between shear force and muscle fiber diameter could be described by the regression equation： y = 1.162e^0.034x （R^2 = 0.932）. The regression equation of shear force versus hydroxyproline content was y = 1.793e^27.430x （R^2 = 0.947）.
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