Effect of treatment with an ivermectin sustained-release bolus on productivity of stocker beef calves

Three groups of 30 crossbred beef steers, 8–10 months of age and ranging in weight from 158 to 320 kg, were used to compare effects of treatment with an ivermectin sustained-release bolus or two ivermectin injectable treatments on parasite control and productivity in relation to untreated controls d...

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Bibliographic Details
Published in:Veterinary parasitology 1995-05, Vol.58 (1), p.75-82
Main Authors: Williams, J.C., Loyacano, A.F., Broussard, S.D., Coombs, D.F.
Format: Article
Language:English
Subjects:
Animals
CALVES
Cattle
Cattle Diseases - prevention & control
Cattle-Nematoda
Control methods-Nematoda
Controlled release technology
COOPERIA
Delayed-Action Preparations
Feces - parasitology
HAEMONCHUS
IVERMECTIN
Ivermectin - administration & dosage
IVERMECTINA
IVERMECTINE
NEMATODA
OSTERTAGIA
Parasite Egg Count
Seasons
TERNERO
Trichostrongyloidiasis - prevention & control
Trichostrongyloidiasis - veterinary
VEAU
Weight Gain
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Summary:Three groups of 30 crossbred beef steers, 8–10 months of age and ranging in weight from 158 to 320 kg, were used to compare effects of treatment with an ivermectin sustained-release bolus or two ivermectin injectable treatments on parasite control and productivity in relation to untreated controls during a 168 day winter-spring grazing period. Each group of 30 consisted of five cattle on each of six separate 1.6 ha pastures. Treatments on Day 0 (12 December) were: Group 1: untreated controls; Group 2: ivermectin injectable at 200 μg kg −1 bodyweight, s.c., on Day 0 and Day 56; Group 3: ivermectin sustained-release bolus to deliver ivermectin at 12 mg day −1 over approximately 135 days. All cattle were weighed at 28 day intervals and fecal samples were collected for egg per gram counts (EPG). Geometric mean EPG for Group 3 remained consistently less than 1.0 after Day 0 and were highest (2.4) on Day 168. All group EPG were significantly different ( P
ISSN:0304-4017
1873-2550
DOI:10.1016/0304-4017(94)00707-J