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  • Title: Efficacy of ivermectin controlled-release capsules for the control and prevention of nasal bot infestations in sheep.
    Author: Rugg D, Gogolewski RP, Barrick RA, Eagleson JS.
    Journal: Aust Vet J; 1997 Jan; 75(1):36-8. PubMed ID: 9034497.
    Abstract:
    OBJECTIVE: To investigate the therapeutic and prophylactic efficacy of an ivermectin controlled-release capsule against nasal bots (Oestrus ovis) in sheep. DESIGN: Trial 1--A pen study with controls. Trial 2--A field study with controls. ANIMALS: Trial 1--Forty Merino wethers with natural infestations of nasal bot were used. Trial 2--One hundred nasal bot-free wethers were used. PROCEDURE: Trial 1--Ten randomly selected animals were slaughtered and the heads split and examined to confirm bot infestation. Fifteen animals were allocated to untreated controls and 15 to treatment with a controlled-release capsule delivering ivermectin at > or = 20 micrograms/kg/day for 100 days. Twenty-nine days after treatment the sheep were killed and examined for nasal bots. Trial 2--Nasal bot-free sheep were allocated to two groups of 45 animals. One group was untreated the other sheep were treated with capsules as above. The sheep were grazed as a single group exposed to natural challenge from O ovis. Ninety days after treatment the animals were slaughtered and examined for nasal bot infestation. RESULTS: Trial 1--Live O ovis larvae were recovered from 60% of control sheep. No live larvae were collected from treated sheep. Trial 2--Forty-one percent of untreated sheep harbored nasal bot infestations. No live larvae were collected from any treated animal. CONCLUSION: Treatment with a single ivermectin controlled release capsule was 100% effective against existing infestations of O ovis and as a prophylactic treatment for this parasite.
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