Department of Large Animal Sciences, Faculty of Life Sciences, University of Copenhagen, Grønnegårdsvej 2, DK-1870 Frederiksberg C, Denmark.
Prev Vet Med. 2012 Jan 1;103(1):31-7. doi: 10.1016/j.prevetmed.2011.09.009. Epub 2011 Oct 13.
Mortality of sows is a major problem for pig production worldwide. In this study, we used hierarchical multivariable logistic analyses to investigate different risk factors for mortality at the sow and herd level in herds with group-housed pregnant sows. Data included 3652 pregnant and 1266 lactating sows from 34 sow herds. A clinical examination for 16 clinical signs was carried out for each sow, and information about 16 herd related factors was obtained by interviews. Farm records were used to obtain information about whether or not sows died suddenly or were euthanized within 3 months after the clinical examination. Factors increasing the risk of sow mortality in the gestation unit were solid pen floors (OR=1.87), presence of vulva bites (OR=1.73) and unwillingness to stand when approached (OR=1.62). Factors increasing the risk of sow mortality in the lactation unit were pale vulva color (OR=12.69), body leanness (OR=4.11), and presence of shoulder ulcers (OR=2.89). The estimated between herd variation was small. Thus, the findings for the sow level variables may be generally applicable for sows in herds with group housed systems.
母猪死亡率是全球养猪业的一个主要问题。在这项研究中，我们使用分层多变量逻辑分析来调查群体饲养妊娠母猪的猪群中母猪和猪群水平上的不同死亡风险因素。数据包括来自 34 个母猪场的 3652 头妊娠母猪和 1266 头泌乳母猪。对每头母猪进行了 16 种临床症状的临床检查，并通过访谈获得了 16 个与猪群相关的因素信息。农场记录用于获得母猪在临床检查后 3 个月内是否突然死亡或被安乐死的信息。增加妊娠单元母猪死亡率风险的因素有实心猪圈地板（OR=1.87）、外阴咬伤（OR=1.73）和接近时不愿意站立（OR=1.62）。增加泌乳单元母猪死亡率风险的因素有苍白的外阴颜色（OR=12.69）、身体消瘦（OR=4.11）和肩部溃疡（OR=2.89）。猪群间的变异估计较小。因此，对于群体饲养系统的猪群中的母猪，这些发现对于母猪水平的变量可能具有普遍适用性。
