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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Short-term effect of antibiotic feeding on site and extent of digestion of growing and finishing diets in feedlot cattle.

Two metabolism trials were conducted to evaluate the influence of therapeutic antibiotic supplementation on characteristics of digestion of growing and finishing diets. Treatments consisted of a basal diet supplemented with: no antibiotics, 350 mg chlortetracycline and 350 mg sulfamethazine and 700 mg chlortetracycline and 700 mg sulfamethazine. In trial 1, treatment effects were evaluated in a replicated 3 X 3 Latin-square design experiment involving six crossbred steers (462 kg) with cannulas in the rumen and proximal duodenum. The basal diet contained (dry matter basis) 16.1% alfalfa hay, 72% steam flaked corn, 3.3% molasses, 5.8% fat, .96% urea, .79% limestone, .50% trace mineral salt, 33 mg/kg lasalocid, 2,200 IU/kg vitamin A and .44% chromic oxide. Dry matter intake was limited to 1.4% of body weight. In trial 2, treatment effects were evaluated in a 3 X 3 Latin-square design experiment involving three steers (399 kg) with cannulas in the rumen and proximal duodenum. The basal diet contained (dry matter basis) 10.1% sudangrass hay, 34.9% alfalfa hay, 43.9% steam flaked corn, 6.1% molasses, 4.0% fat, .46% urea, .49% trace mineral salt, 33 mg/kg lasalocid and 2,200 IU/kg vitamin A. Dry matter intake was limited to 1.65% of body weight. Antibiotic supplementation did not influence microbial efficiency, passage of microbial and feed N to the small intestine, or either ruminal or total tract digestion of organic matter and acid detergent fiber in either growing or finishing diets (P greater than .20).(ABSTRACT TRUNCATED AT 250 WORDS)[1]

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