Draper D D, Rothschild M F, Christian L L, Goedegebuure S A
Iowa State University, Ames 50011.
J Anim Sci. 1988 Jul;66(7):1636-42. doi: 10.2527/jas1988.6671636x.
Sixty Duroc pigs, representing offspring of three lines from the fifth generation of divergent selection for leg weakness, were examined to determine correlated responses in joint angularity. The lines were low, control, and high, with the latter having superior front leg structure. At approximately 100 kg, 10 pigs of each sex and line were scored for front and rear leg structure and movement. The shoulder, elbow, carpal and hock joints were measured for resting angles and range of motion. The model to analyze the data included the effects of line, sire, sex and side and covariable for weight. High-line pigs had significantly smaller (P less than .05) resting angles of the elbow joint than did control- or low-line pigs. The low-line pigs, however, had significantly smaller resting angles at the carpal joint (P less than .01) and greater resting angles at the hock joint (P less than .05) than did control- or high-line pigs. The low-line pigs had fewer degrees extension at the elbow joint and fewer degrees flexion at the carpal joint than did control- or high-line pigs. High-line pigs had fewer degrees of flexion of the elbow joint than did control-or low-line pigs. Resting angles and range of motion for the elbow and carpal joints were less on the left side than on the right side. Males had greater degrees of extension and total degrees of movement at the elbow joint than did females. Selection for different degrees of leg weakness resulted in accompanying alterations in angularity of joints.
选用六十头杜洛克猪进行研究，这些猪是腿部软弱性状第五代 divergent 选择中三个品系的后代，旨在确定关节角度的相关反应。这三个品系分别为低腿弱系、对照系和高腿弱系，其中高腿弱系具有更优的前腿结构。在猪体重约100千克时，对每个品系的10头公猪和10头母猪的前后腿结构及运动情况进行评分。测量了肩部、肘部、腕关节和跗关节的静息角度和活动范围。分析数据的模型包括品系、父系、性别、体侧的影响以及体重协变量。高腿弱系猪的肘关节静息角度显著小于对照系或低腿弱系猪（P < 0.05）。然而，低腿弱系猪的腕关节静息角度显著小于对照系或高腿弱系猪（P < 0.01），跗关节静息角度则显著大于对照系或高腿弱系猪（P < 0.05）。低腿弱系猪肘关节的伸展度数和腕关节的屈曲度数均少于对照系或高腿弱系猪。高腿弱系猪肘关节的屈曲度数少于对照系或低腿弱系猪。肘关节和腕关节的静息角度及活动范围左侧小于右侧。公猪肘关节的伸展度数和总活动度数大于母猪。针对不同程度的腿部软弱进行选择，会导致关节角度随之发生改变。
