Efficacy of a morantel sustained-release bolus for the control of gastrointestinal nematodes in Florida dairy heifers
Bradley, R.E.; Bliss, D.H.; Newby, T.J.
American Journal of Veterinary Research 47(11): 2385-2388
1986
ISSN/ISBN: 0002-9645 PMID: 3789499 Document Number: 284618
The effectiveness of a morantel sustained-release bolus (MSRB) in controlling gastrointestinal nematode infections was determined in 70 Holstein heifer calves with no prior grazing experience. Calves were allotted to 2 treatment groups and were maintained in Florida during the grazing season on divided pastures of equal area. One MSRB was administered to each calf in 1 group at the time of turnout onto spring pasture, whereas calves in the other group remained as non-medicated controls. By the end of the grazing season, treatment resulted in significantly lower worm burdens and significantly improved weight gains. The MSRB-treated calves were able to reach breeding weight 2 to 4 weeks earlier than did non-medicated calves.