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The Effect of DDT upon the Digestion and Utilization of Certain Nutrients by Dairy Calves¹

Utah Agricultural Experiment Station, Logan

ABSTRACT

Digestion and balance trials were conducted with 16 Holstein bull calves. Each calf was fed one level of DDT and four levels of protein equivalent arranged in an orthogonal manner to take into account the time the protein level was fed in relation to the growth of the calves. The DDT levels were 0, 25, 50 and 100 ppm. of the diet and the protein equivalent levels were 10.2, 12.4, 14.5 and 16.5 per cent in the dry diet, respectively.

Symptoms consisting of skin wrinkling, thickening of the skin, profuse scaling, thinning of the hair, lacrimation from the eyes, watery discharge from the nose and tremors were noticed. These symptoms were more pronounced in the calves fed the highest levels of DDT.

As the DDT in the diet increased the amount of nitrogen stored decreased. The Ca and P balances were not affected by any treatment. DDT did not affect the digestibility of organic matter, crude protein, ether extract, cellulose, lignin, crude fiber and other carbohydrates. The addition of urea to the diet improved the digestibility of crude fiber and cellulose, but did not affect the digestibility of the other nutrients.

¹ Presented at the Utah Academy of Sciences, Arts and Letters Meeting, Provo, November, 1950.

² Present address, Cornell University.