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Effects of Trace Minerals, Aureomycin, and other Supplements on Certain Hematologic Values and Organ Weights of Dairy Calves¹

Department of Physiology, School of Veterinary Medicine, and Department of Dairy Husbandry, Kansas State College, Manhattan

ABSTRACT

In a recent publication (9), the effects of trace minerals, chlortetracycline,² and other dietary constituents on growth and feed consumption of dairy calves were reported. It was found that newborn calves fed dietary trace minerals grew at a significantly faster rate than controls during the first 7 wk., but it was not until the 8th wk. that the spread in average size between the groups was statistically significant. From 8 to 24 wk., calves supplemented with trace minerals continued to average larger than the controls but, comparatively, there was a gradually diminishing growth rate of the calves supplemented with trace minerals. A third group of calves, fed trace minerals, major minerals, water-soluble and fat-soluble vitamins, and chlortetracycline, grew for 8 wk. at a rate similar to those fed trace minerals, but from 8 to 24 wk. this third group grew significantly faster than either the trace mineral-supplemented group or the controls, and were considerably larger at 24 wk. than those in either of the two other groups.

¹ Contribution No. 156, Dept. of Veterinary Medicine, and No. 249, Dept. of Dairy Husbandry, Kansas Agricultural Experiment Station.