Hammond D, Matty G
Vet Rec. 1980 Jan 26;106(4):72-5. doi: 10.1136/vr.106.4.72.
During a one year period, 1459 sows and gilts were treated with cloprostenol to induce farrowing during the night on a large commercial pig farm. A regular farrowing supervision programme was used during each farrowing period. The mean time from treatment to onset of farrowing was 25.7 hours (SD 5.36) and 95.3 per cent of aniamls commenced farrowing within 36 hours. There was a significant (P less than 0.001) increase in the proportion of piglets reared to weaning during the trial when compared with both the previous year and the average for the previous three years. The proportion of stillborn piglets and mortality of liveborn piglets up to weaning were significantly (P less than 0.001) reduced during the period of the trial. Similarly the number of piglets crushed by the sow was significantly (P less than 0.001) reduced. However, the proportion of piglets dying as runts increased significantly (P less than 0.001) and as a result of an isolated outbreak of scouring during one month of the trial, the number of piglets lost because of scouring also increased significantly (P less than 0.001). Several practical and economic benefits were identified as part of the new management system.
在一年时间里，一家大型商业养猪场对1459头母猪和后备母猪使用氯前列醇进行处理，以诱导其在夜间产仔。在每个产仔期都采用了常规的产仔监督程序。从处理到开始产仔的平均时间为25.7小时（标准差5.36），95.3%的动物在36小时内开始产仔。与上一年以及前三年的平均水平相比，试验期间育成至断奶的仔猪比例显著增加（P<0.001）。试验期间，死产仔猪的比例和活到断奶的仔猪死亡率显著降低（P<0.001）。同样，被母猪压死的仔猪数量也显著减少（P<0.001）。然而，作为弱小仔猪死亡的比例显著增加（P<0.001），并且由于试验期间一个月内发生的一次孤立的腹泻疫情，因腹泻而损失的仔猪数量也显著增加（P<0.001）。作为新管理系统的一部分，确定了若干实际和经济效益。
