Dee S A, Joo H S, Polson D D
Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
Vet Rec. 1996 Jan 13;138(2):31-4. doi: 10.1136/vr.138.2.31.
An attempt was made to compare the productivity and financial benefits of nursery depopulation on five large pig farms which were all part of one complex. Each farm had been experiencing poor post weaning performance for 12 months, and had previously been infected with porcine reproductive and respiratory syndrome virus (PRRSV). A plan to depopulate each nursery sequentially was established, and the pigs were moved to fattening facilities on one of the farms (farm 3) where space was available. Over a four week period, the nurseries of farms 1, 2, 4 and 5 were emptied, cleaned and disinfected, and any changes in nursery performance, mortality and the seroprevalence of antibodies to PRRSV were then assessed for one year. The financial benefit to the entire farm complex was analysed by using partial budget methods. During the year a net benefit of $1,708,431 was assessed to the farm complex owing to the increased numbers of marketable pigs and the reduced antibiotic costs. There were highly significant improvements in nursery growth rate and decreases in mortality on farms 1, 2, 4 and 5, and antibodies to PRRSV were detected on farms 3 and 4 but not on farms 1, 2 and 5. The inability to empty the farm 3 fattening facility, which housed the pigs from the other sites, may have led to the maintenance of its PRRSV positive status and could have served as the source of virus for farm 4.
在一个综合养殖场内的五个大型养猪场进行了一项比较保育舍清栏的生产效率和经济效益的尝试。每个猪场在断奶后性能不佳已持续12个月，且之前感染过猪繁殖与呼吸综合征病毒（PRRSV）。制定了按顺序清空每个保育舍的计划，猪只被转移到其中一个有空余空间的猪场（猪场3）的育肥设施中。在四周的时间里，猪场1、2、4和5的保育舍被清空、清洁和消毒，然后在一年时间内评估保育舍性能、死亡率以及PRRSV抗体血清阳性率的任何变化。通过使用部分预算方法分析了整个养殖场的经济效益。在这一年中，由于可上市猪只数量增加和抗生素成本降低，整个养殖场评估获得了1,708,431美元的净收益。猪场1、2、4和5的保育舍生长速度显著提高，死亡率下降，并且在猪场3和4检测到了PRRSV抗体，但在猪场1、2和5未检测到。无法清空容纳来自其他场地猪只的猪场3育肥设施，可能导致其PRRSV阳性状态持续存在，并可能成为猪场4的病毒来源。
