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Some Effects of Feeding Iodinated Casein to Dairy Cows^1,2,

Department of Biochemistry, College of Agriculture, University of Wisconsin, Madison

ABSTRACT

Data have been secured on the effect of feeding 15 g. of iodinated casein daily to eleven dairy cows for varying periods of time and under various conditions. Increases in milk and butterfat production were obtained. All cows lost weight and had increased heart rates. Night-morning milk composites were obtained at 2- and 3-week intervals during the experimental period and analyzed for fat, total solids, skim milk nitrogen, casein nitrogen, non-protein nitrogen, urea and ammonia nitrogen, and vitamin C. Decreases of 30 to 63 per cent in vitamin C and of 20 to 40 per cent in urea nitrogen and a maximum decrease of 0.05 per cent (0.32 per cent protein) in the skim milk nitrogen were found.

Blood samples were taken, concurrently with the milk samples and analyzed for total nitrogen, plasma nitrogen, non-protein nitrogen, urea and ammonia nitrogen, vitamin C, and per cent cells. Blood urea nitrogen decreased.

The duration of response varied from 6 to 15 weeks, after which a marked drop in milk yield occurred after iodinated casein feeding was discontinued. Age and breed differences in response were noted. The limitations of iodinated casein for commercial usage are discussed.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. This work was supported in part by funds granted by the National Dairy Council, Chicago, on behalf of the American Dairy Association.

² The authors wish to thank the Cerophyl Laboratories, Inc., Kansas City, Missouri, for the iodized casein, and the Department of Dairy Husbandry for providing the experimental cows.