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Antibiotics in Dairy Cattle Nutrition. VI. The Effects of Aureomycin¹ Feeding on the Apparent Digestibility of Certain Calf Rations^,2

Departments of Dairy Husbandry and Chemistry Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

The increased growth rate and improved feed efficiency that result from feeding aureomycin to dairy calves (2, 18) suggested an investigation of the effect of aureomycin supplement on the digestibility of calf rations. Such a study might help in determining the mode of action of the antibiotic.

Since the present study was started, Murley et al. (14) have reported that the addition of aureomycin to a dairy calf ration resulted in a slightly, but not significantly, greater efficiency of "utilization" of carbohydrates, nitrogen, ash, and ether extract. Hibbs et al. (10) found that the addition of aureomycin to a hay and grain ration did not affect the digestion of dry matter, cellulose, and protein by 12-week-old calves.

Studies on the effects of antibiotics on the digestibility of nutrients by non-ruminants have produced a number of conflicting reports (3–8, 11, 16, 19, 20).

EXPERIMENTAL PROCEDURE

Twelve male calves (six Holsteins, four Jerseys, and two Guernseys) were paired by breed and age.

¹ The trademark of Lederle Laboratories Div., American Cyanamid Co., Pearl River, N. Y., for the antibiotic chlortetracycline.

² Contribution No. 239, Dept. of Dairy Husbandry, and No. 533, Department of Chemistry, Kansas Agricultural Experiment Station, Manhattan. Supported in part by a grant from American Cyanamid Co.