Ma. Fisher et al., EVALUATION OF DORAMECTIN IN A PROGRAM FOR SEASON-LONG CONTROL OF PARASITIC GASTROENTERITIS IN CALVES, Veterinary record, 137(12), 1995, pp. 281-284
Doramectin was used in a strategic programme for the prevention of par
asitic gastroenteritis in first season grazing calves, Three groups of
nine calves were used: group 1 was left untreated, group 2 was treate
d with doramectin at 0.2 mg/kg at turnout and again eight weeks later,
and group 3 was treated with 0.2 mg/kg ivermectin at three, eight and
13 weeks after turnout, Both treatment programmes prevented the gastr
oenteritis which occurred in the controls. The growth rates of the tre
ated calves were superior, and their faecal egg output, and serum peps
inogen and gastrin concentrations were all substantially lower than th
ose of the control calves. The numbers of Ostertagia species larvae on
the pastures grazed by the treated calves were also lower than on the
pastures grazed by the control calves.