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Studies of the Effects of Dietary Sodium Fluoride on Dairy Cows. V. A Three-year Study on Mature Animals¹

Department of Biochemistry, University of Wisconsin, Madison

ABSTRACT

The effects of 30 and 50 p.p.m. F fed as the NaF salt to mature, adequately nurtured dairy cows for a period of three lactations have been studied. The fluorine concentration in the bones, urine and, to some extent, the soft tissues was increased. At both levels of intake some evidence of exostosis was evident in the excised long bones after they had been cleaned of adhering tissue. This condition was not discernible before slaughter, nor did it affect the gait of the animals. There was no evidence of impairment of lactation or effect on the maintenance of body weight. In these cows the incisor teeth were not clinically affected by fluorine ingestion. From these results, it would appear that lactating dairy cows first exposed at from 4 to 6 yr. of age will tolerate the ingestion of as much as 50 p.p.m. F for as long as three lactations, with no adverse effects other than mild exostosis of the long bones and increased concentrations of fluorine in the body.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. Supported in part by a grant from the Aluminum Company of America, Pittsburgh, Pennsylvania, on behalf of itself and the Aluminum Laboratories, Ltd., the American Smelting and Refining Co., The Kaiser Aluminum and Chemical Corp., the Monsanto Chemical Co., the Reynolds Metal Co., the Tennessee Valley Authority, the U. S. Steel Corp. of Delaware, and Westvaco, Chemical Division of Food Machinery and Chemical Corp.