Antibiotics have generally been more effective in counteracting, somewhat at least, the growth depression caused by feeding diets containing lower density cereal grains. However, growth responses have not been as consistent using other types of diets. In spite of extensive studies on the subject of antibiotics, their exact mechanism of action is yet to be clearly understood. Several factors have been shown to interfere with the intestinal absorption of these compounds for therapeutic purposes. Among these, calcium level and source have been shown to influence the blood level of tetracyclines.
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Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Kashani, Ali B. and Carlson, C. W., "Aureomycin For Laying Hens" (1982). South Dakota Poultry Field Day Proceedings and Research Reports, 1982. 4.