Robalo Silva J, Noakes D E
Vet Rec. 1984 Sep 8;115(10):242-5. doi: 10.1136/vr.115.10.242.
External pelvic measurements were made in 837 adult ewes of 21 different breeds, the majority of which were rare breeds. The pelvic measurements were the intertuber coxal diameter, the distance between the lateral tuber ischii and medial tuber ischii and the rump length. There was a considerable breed variation with the Soay ewes having the smallest and the Suffolk the largest pelvic dimensions. However when the relationship between pelvic size and ewe's bodyweight was compared, the ratio of the medial tuber ischii:bodyweight and sum of four pelvic dimensions:bodyweight of the Soay was over twice that of the Suffolk ewes. When the size of the pelvis was related to the lamb's birth weight the Soay's was relatively larger. Dystocia caused by feto-maternal disproportion occurred in 19 ewes, all with singletons. In 16 cases involving four different breeds the birth weights of the lambs were significantly larger than those lambs which were born normally.
对21个不同品种的837只成年母羊进行了骨盆外测量，其中大多数为稀有品种。骨盆测量指标包括坐骨结节间径、坐骨外侧结节与内侧结节之间的距离以及臀长。品种间存在相当大的差异，索艾羊的骨盆尺寸最小，萨福克羊的最大。然而，当比较骨盆大小与母羊体重之间的关系时，索艾羊的坐骨内侧结节:体重以及四个骨盆尺寸之和:体重的比值是萨福克母羊的两倍多。当骨盆大小与羔羊出生体重相关时，索艾羊的相对较大。19只母羊发生了胎儿与母体比例失调导致的难产，均为单胎。在涉及四个不同品种的16例病例中，羔羊的出生体重明显高于正常出生的羔羊。
