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In Vivo (Dairy Calves) and in Vitro Studies with Surface-Active Agents ^{1, 2,}

Department of Animal Husbandry, Iowa Agricultural Experiment Station, Ames

ABSTRACT

The feeding of several surface-active agents had no significant influence on the growth rates of dairy calves when fed either in a milk replacement diet or in a concentrate mixture. Moreover, the detergents had no consistent effect on hay and concentrate consumption, incidence of diarrhea, fecal pH, blood plasma fat levels, or on hemoglobin, erythrocyte, leucocyte and differential leucocyte values of the blood. The addition of surface-active agents and of penicillin to distilled water and to rumen fluid caused relatively large reductions in surface tension, whereas aureomycin and terramycin had no appreciable influence on the surface tension of these liquids.

¹ Journal Paper No. J-2436, Iowa Agricultural Experiment Station, Project No. 814.

² Supported in part through funds provided by Lederle Laboratories, Inc., American Cyanamid Co., Pearl River, N. Y.