Kroneman A, Vellenga L, van der Wilt F J, Vermeer H M
Department of Large Animal Medicine and Nutrition, Faculty of Veterinary Medicine, Utrecht, The Netherlands.
Zentralbl Veterinarmed A. 1993 Nov-Dec;40(9-10):704-12. doi: 10.1111/j.1439-0442.1993.tb00687.x.
Investigations on two experimental farms with group-housing revealed that lameness occurred mainly at the hind legs of sows, with a higher incidence in first parity sows. The highest incidence of lameness was seen during the first 2 months of gestation and the highest prevalence in the last 2 months of gestation. No relation could be established between lameness of a sow in the last month of gestation and reproduction results. The incidence of claw lesions increased too, during the group-housing during pregnancy and was higher compared to sows kept in crates. This increase was clearest in first parity sows. In addition the observations suggest a pattern in the course of development of lesions. Claw lesions mainly occur on the outer claws of a sow. For two types of lesions left-right symmetry has been established for both the hind and the front legs. On the level of the individual animal there was no relation between the incidence of claw lesions and lameness.
在两个采用群养方式的实验农场进行的调查显示，跛足主要发生在母猪的后腿，初产母猪的发病率更高。跛足的最高发病率出现在妊娠的前两个月，而最高流行率出现在妊娠的最后两个月。妊娠最后一个月母猪的跛足与繁殖结果之间未发现关联。在妊娠期群养期间，蹄爪病变的发生率也有所增加，与饲养在产栏中的母猪相比更高。这种增加在初产母猪中最为明显。此外，观察结果表明病变发展过程存在一种模式。蹄爪病变主要发生在母猪的外侧蹄爪上。对于两种类型的病变，已确定后腿和前腿的左右两侧均存在对称性。在个体动物层面，蹄爪病变的发生率与跛足之间没有关联。
