Jacobs D E, Fox M T, Ryan W G
Vet Rec. 1987 Jan 10;120(2):29-31. doi: 10.1136/vr.120.2.29.
In a two-year trial involving successive batches of 36 autumn-born steers on two adjacent sites in Hertfordshire, calves treated with ivermectin at three and eight weeks after turn out contaminated pastures much less than untreated control animals. Each year dry summers prevented the larval challenge on the control pastures from building up to high levels until about the time of autumn housing. Atypical outbreaks of parasitic gastroenteritis were recorded in May and June of the second year in both groups of control calves. Clinical and parasitological aspects of these outbreaks are discussed in the context of the epidemiology of the disease. It is concluded that the application of measures to control gastroenteritis can bring benefits in the early part of the grazing season as well as later in the year.
在一项为期两年的试验中，在赫特福德郡相邻的两个地点，连续分批对36头秋季出生的公牛进行试验。放牧后3周和8周时用伊维菌素处理的犊牛，其污染牧场的程度远低于未处理的对照动物。每年干燥的夏季使得对照牧场的幼虫感染直到秋季圈舍期左右才积累到高水平。在第二年的5月和6月，两组对照犊牛均记录到非典型的寄生虫性肠胃炎暴发。在疾病流行病学的背景下讨论了这些暴发的临床和寄生虫学方面。得出的结论是，采取控制肠胃炎的措施在放牧季节早期以及当年后期都能带来益处。
