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Journal of Animal Science, Vol 71, Issue 1 213-217, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Influence of oral antibiotics on digestive function in Holstein steers fed a 71% concentrate diet

R. A. Zinn
Department of Animal Science, Imperial Valley Agricultural Center, University of California, El Centro 92243.

Four Holstein steers (164 kg) with cannulas in the rumen and proximal duodenum were used to evaluate the effects of oral antibiotic administration on characteristics of digestion of a 71% concentrate diet. Treatments were as follows: 1) no antibiotic; 2) 350 mg.steer-1.d-1 of chlortetracycline (CTC) provided in the feed (A350); 3) 350 mg.steer-1.d-1 of CTC plus 350 mg.steer-1.d-1 of sulfamethazine provided in the feed (AS700); 4) 22 mg of CTC/kg BW (3.6 g.steer-1.d-1) provided in the drinking water (A3600). Drinking water intake averaged 23.5 L/d and was not affected (P > .10) by treatments. Antibiotic treatments increased passage (P < .05) of OM to the small intestine. This effect was largely due to decreased (27%, P < .05) ruminal ADF digestion. Passage of nonammonia N to the small intestine was greater (10.4%, P < .01) for A3600 vs A350 and AS700; the latter was similar to the control. This effect was due to an increased (23.4%, P < .05) synthesis of microbial N. Total tract digestion of OM (P < .05), starch (P < .05), N (P < .10), and DE (P < .10) were slightly lower (2.7, 1.6, 2.8, and 2.7%, respectively) for antibiotic-supplemented diets. Total tract starch (P < .10) and N (P < .01) digestion were further decreased (1.2 and 3.5%, respectively) for A3600 vs A350 and AS700. Postruminal digestion of ADF was greater (131%, P < .10) for antibiotic-supplemented diets, compensating for the lower ruminal digestion. There were no treatment effects (P > .10) on ruminal pH.(ABSTRACT TRUNCATED AT 250 WORDS)


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J. C. Marini, D. G. Fox, and M. R. Murphy
Nitrogen transactions along the gastrointestinal tract of cattle: A meta-analytical approach
J Anim Sci, March 1, 2008; 86(3): 660 - 679.
[Abstract] [Full Text] [PDF]


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Copyright © 1993 by the American Society of Animal Science.