Entrocasso C M, Parkins J J, Armour J, Bairden K, McWilliam P N
Res Vet Sci. 1986 Jan;40(1):76-85.
Friesian steers were exposed to natural trichostrongyle infection and left untreated (controls) or treated with either a morantel sustained release bolus or fenbendazole at two week intervals (clean) in each of two consecutive grazing seasons. In the second grazing season the mean liveweight gains of the clean, morantel treated and control groups of cattle over 152 days were 105, 131 and 109 kg respectively (morantel treated greater than clean, control P less than 0.02). The cattle were slaughtered following an indoor fattening period. The dressed carcase weight, killing out percentage and related carcase measurements were superior in the treated groups. Eighty per cent of the clean and morantel treated cattle graded satisfactorily and qualified for subsidy payment whereas less than 30 per cent of the control cattle were successful. Rib joint analyses showed significantly lower total weight, eye muscle weight and area together with a higher bone content in control cattle.
在连续两个放牧季节中，弗里生公牛被暴露于自然的毛圆线虫感染环境且不进行治疗（作为对照组），或者每隔两周分别用莫仑太尔缓释丸剂或芬苯达唑进行治疗（驱虫组）。在第二个放牧季节，驱虫组、莫仑太尔治疗组和对照组的牛在152天内的平均体重增加量分别为105千克、131千克和109千克（莫仑太尔治疗组大于驱虫组、对照组，P<0.02）。经过室内育肥期后，牛被屠宰。处理组的胴体重、屠宰率及相关胴体测量指标更优。80%的驱虫组和莫仑太尔治疗组牛评级良好并符合补贴标准，而对照组中只有不到30%的牛达标。肋排分析显示，对照组牛的总重量、眼肌重量和面积显著更低，且骨含量更高。
