Wamae L W, Hammond J A, Harrison L J, Onyango-Abuje J A
National Veterinary Research Center, Kikuyu, Kenya.
Trop Anim Health Prod. 1998 Feb;30(1):23-30. doi: 10.1023/a:1005057225427.
Yearling Friesian and Boran cattle were given a standard dose of Fasciola gigantica metacercariae designed to produce chronic infection. Their liveweights were then monitored for 23 weeks post-infection. Following standard meat inspection procedures, all the livers from the infected cattle were condemned. At 22 kg per animal, the mean reduction in liveweight gain in infected Borans was significantly greater than in infected Friesians. Compared to the control cattle and based on current sale prices in Kenya, the production losses from the combination of liver condemnations and reduction in liveweight gain constituted a loss in value of US$$12.11 (4.92%) and US$23.41 (10.34%) for Friesians and Borans respectively. These data indicate that productivity losses and the economic consequencies of fasciolosis in yearling Boran cattle are much more severe than in Friesians. These findings have implications for assessing the likely benefits of control measures against this parasite.
给一岁的弗里斯兰牛和博拉安牛注射标准剂量的巨片形吸虫囊蚴，以引发慢性感染。然后在感染后的23周内监测它们的体重。按照标准的肉类检验程序，所有感染牛的肝脏均被判定不合格。每头动物减重22千克，感染博拉安牛的平均体重增加减少幅度显著大于感染弗里斯兰牛。与对照牛相比，根据肯尼亚目前的销售价格，肝脏判定不合格和体重增加减少相结合造成的生产损失，弗里斯兰牛和博拉安牛的价值损失分别为12.11美元（4.92%）和23.41美元（10.34%）。这些数据表明，一岁博拉安牛的生产力损失和肝片吸虫病的经济后果比弗里斯兰牛严重得多。这些发现对于评估针对这种寄生虫的控制措施可能带来的益处具有启示意义。
