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Effect of Terramycin Fed to Holstein Calves on Growth, In-Vitro Cellulose Digestion and B-Vitamin Synthesis^{1, 2,}

Pennsylvania Agricultural Experiment Station

Abstract

The addition of terramycin to a milk replacement diet for young calves stimulated growth significantly, as measured by body weight gains and increase at height at withers. Supplemented calves consumed more concentrates, and at an earlier age.

There was little apparent effect on the concentrations of thiamine and riboflavin in the rumen fluid obtained from these calves at ages 6, 12 and 16 weeks. Levels of these vitamins were considerably higher than in the feed afforded the calves.

Terramycin in the milk replacement, or administered by capsule, lowered the in vitro breakdown of cellulose by microorganisms of the rumen fluid, as measured in an artificial rumen.

¹ Authorized for publication as paper No. 1813 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

² The terramycin used in these trials was kindly supplied by Chas. Pfizer and Co. Inc., Brooklyn, N. Y.