Rizvi S, Nicol C J, Green L E
Department of Clinical Veterinary Science, University of Bristol, Langford.
Vet Rec. 1998 Dec 12;143(24):654-8.
A postal survey was conducted on 410 pig farms in south-west England to investigate the risk factors for vulva biting. The results of the bivariate analyses indicated that group housing, keeping a boar in the same pen and the number of sows per drinker were significantly associated (P < or = 0.05) with vulva biting in service sows. Group housing, group size, keeping a boar in the same pen, straw bedding, electronic sow feeders, feeding once daily, providing water automatically and the number of sows per drinker were significantly associated with vulva biting in dry sows. Vulva biting was also significantly associated with an increased percentage of culled sows and the occurrence of tail biting on the farm. A logistic regression analysis showed that group size and the number of sows per drinker were significant risk factors for vulva biting in service sows, and once a day feeding, group size, the number of sows per drinker and providing water automatically were significant risk factors for dry sows.
对英格兰西南部的410个养猪场进行了一项邮政调查，以调查母猪外阴被咬的风险因素。双变量分析结果表明，群养、在同一栏中饲养公猪以及每个饮水器对应的母猪数量与配种期母猪外阴被咬显著相关（P≤0.05）。群养、群体规模、在同一栏中饲养公猪、垫草、电子母猪饲喂器、每日饲喂一次、自动供水以及每个饮水器对应的母猪数量与空怀期母猪外阴被咬显著相关。外阴被咬还与淘汰母猪比例增加以及农场中咬尾现象的发生显著相关。逻辑回归分析表明，群体规模和每个饮水器对应的母猪数量是配种期母猪外阴被咬的显著风险因素，而每日一次饲喂、群体规模、每个饮水器对应的母猪数量和自动供水是空怀期母猪外阴被咬的显著风险因素。
