Ruminal changes in monensin- and lasalocid-fed cattle grazing bloat-provocative alfalfa pasture

Journal of Animal Science
M P KatzL R Fina

Abstract

Microbial and fermentation changes in the rumen in monensin- and lasalocid-fed cattle grazing bloat-provocative alfalfa pasture were studied using genetically bloat-susceptible, ruminally-cannulated adult cattle. Monensin at .66 and .99 mg/kg body weight daily reduced the severity of legume bloat by 41 and 73%, respectively. The same doses of lasalocid reduced bloat by 25 and 12%. Comparison of ruminal contents from animals before treatment with ruminal contents from antibiotic-treated animals showed no differences in pH, ammonia, soluble N, soluble carbohydrate, ethanol-precipitable slime and anaerobic bacterial counts. Monensin treatment decreased protozoal numbers and microbial activity, as evidenced by lower gas production from in vitro fermentation of ground alfalfa hay when compared to pretreatment. Lasalocid had no effect on protozoal counts and in vitro gas production. Addition of monensin or lasalocid (12 micrograms/ml) to in vitro fermentation of chopped, fresh alfalfa reduced microbial activity as evidenced by higher soluble N, lower ammonia concentration and decreased gas production. Monensin reduced the amount of ethanol-precipitable slime and protozoal numbers. Reduction in the severity of bloat when monensin was ...Continue Reading

Citations

Apr 9, 1998·Journal of Dairy Science·J H Van der WerfJ K Oldenbroek
Jan 1, 1991·Australian Veterinary Journal·L B LoweS C Valentine
Aug 1, 1989·Archiv für Tierernährung·G I KalachnyukB M Leskovich
Jan 1, 1994·Archiv für Tierernährung·J P Jouany
Jun 24, 2011·Journal of the American College of Nutrition·Raul A WapnirFima Lifshitz
Jul 4, 2006·The Veterinary Clinics of North America. Food Animal Practice·Douglas L Step, Robert A Smith

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