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The Influence of Feeding Thiouracil to Dairy Bull Calves¹

Nebraska Agricultural Experiment Station

Abstract

Thiouracil feeding to young calves at a dosage level of from .035 to .065 gram per kilogram body weight did not influence the rate of gain, percent of fat in the flesh, nor size of organ weights except that of the thyroid. The thyroid weight on a body weight basis was greater for the thiouracil fed calves than for the control animals.

There was a significant negative correlation between thyroid size and rate of gain and a significant positive correlation between thyroid size and percent of fat in the meat for thiouracil-fed calves but not for the control group.

The feeding of flesh from the thiouracil fed calves to rats did not influence significantly their body, thyroid, liver, or kidney weights when compared with a group of rats receiving flesh from the control calves. Apparently the amount of thiouracil retained in the flesh of thiouracil-fed calves was insufficient to affect the characters studied.

¹ Published with the approval of the Director as Paper No. 498 Journal Series Nebraska Agricultural Experiment Station.