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Sodium versus Chloride for the Therapy of Salt-Deficient Dairy Cows^{1, 2,}

Cornell University⁴, Ithaca, N. Y.

ABSTRACT

A comparison of sodium and chloride ions for the treatment of salt-deficient dairy cows showed the sodium ions but not the chloride ions to be of therapeutic value. When sodium chloride was fed to salt-deficient cows, increases in milk production, body weight, and roughage consumption occurred. When sodium bicarbonate was fed, similar increases occurred. The feeding of magnesium chloride failed to interrupt a progressive decline in milk production, body weight, and roughage consumption. When sodium bicarbonate was fed along with magnesium chloride, the downward trends in milk production, body weight, and roughage consumption were reversed, and increases resembling those in the other sodium-fed groups were obtained. Increases in milk production and body weight were not satisfactorily explained on the basis of increased roughage consumption. Studies of blood sodium and potassium levels and plasma sodium, potassium, and chloride levels showed changes in sodium and chloride levels due to certain of the treatments.

¹ Supported in part by a grant from the Salt Producers' Association.

² A portion of the thesis presented to the Graduate School of Cornell University by P. D. Aines, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

³ Present address: The Buckeye Cellulose Corporation, Cincinnati 17, Ohio.

⁴ Department of Animal Husbandry, Ithaca, New York.