ThePigSite猪病速查
塌背（背部隆起，形状古怪）
患猪接近性成熟时身体变形，看起来似乎两头猪从中间接在一起一样。肋骨后的背部明显塌陷，而中、后腹部相对的背部明显隆起。这属于异常情况，而且很难看，不过假如不伴发其它疾病的话，这种猪其它任何方面都和健康猪一样正常。
In some cases it is a developmental condition and probably environmental although what factors in the environment cause it are not known. The affected farms may have a significant proportion of their growing breeding stock with it but closely related breeding stock on other farms all develop normally. In herds where the condition is common there may be a boar conformation involvement. Record and observe progeny from suspect boars. It has also been associated with excessive riding of boars and back damage. Early onset of puberty has been implicated in boars.
有些病例的病情可能是进行性的，有可能和环境有关，但至于什么环境因素导致了这种疾病目前还不清楚。可能某猪场发病率很高，而其它猪场里与这些患猪有血缘关系的猪只却发育正常。如果这种病发病率高，可能与公猪有关，建议对可疑公猪的后裔进行跟踪。另外，这种病似乎和公猪过度爬跨、背部损伤有关。公猪当中的病例有提前性成熟的倾向。
严重的病例可能出现局部或全身瘫痪。这种患猪应该淘汰。死亡率通常较低。
