Dee S A, Joo H S, Polson D D, Park B K, Pijoan C, Molitor T W, Collins J E, King V
College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
Vet Rec. 1997 Mar 8;140(10):247-8. doi: 10.1136/vr.140.10.247.
Nursery depopulation has been described as an effective strategy for improving the performance of weaned pigs. In order to assess whether the strategy was effective under a wide range of conditions, a study was carried out on 34 farms in the USA. Four groups with different depopulation protocols were designed on the basis of the location of the depopulated facility (on site vs off site) and the period for which the nursery remained empty (seven days vs 14 days). The changes in average daily liveweight gain, percentage mortality, feed efficiency and treatment cost per pig produced were assessed 12 months before and after nursery depopulation. The ability to eliminate porcine reproductive and respiratory syndrome (PRRS) virus was examined by indirect fluorescent antibody testing of the nursery pigs. Significant improvements (P < 0.0001) were detected in both average daily gain and percentage mortality after depopulation when the differences within an individual group were analysed, but no significant differences (P > 0.14) were observed between the study groups. Serological testing indicated that antibodies to PRRS virus were still present in 14 of the 34 farms after depopulation.
保育舍清空已被描述为提高断奶仔猪生产性能的一种有效策略。为了评估该策略在广泛条件下是否有效，在美国的34个农场开展了一项研究。根据清空设施的位置（场内 vs 场外）以及保育舍空置的时间（7天 vs 14天）设计了四组不同的清空方案。在保育舍清空前后12个月评估了平均日增重、死亡率、饲料效率以及每头生产仔猪的治疗成本的变化。通过对保育仔猪进行间接荧光抗体检测来检查消除猪繁殖与呼吸综合征（PRRS）病毒的能力。当分析单个组内的差异时，清空后平均日增重和死亡率均有显著改善（P < 0.0001），但各研究组之间未观察到显著差异（P > 0.14）。血清学检测表明，清空后34个农场中有14个农场仍存在PRRS病毒抗体。
