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Comparative Physiological Responses of Dairy Calves Fed Rations Having Different Levels of Milk Proteins¹

Division of Dairy Husbandry, University of Minnesota, St. Paul, Minnesota

ABSTRACT

1. The responses of two major groups of milk-fed calves, one receiving a ration of normal nutritive ratio and the other of narrow nutritive ratio, were compared.
   
2. All calves regardless of supplements possessed a depraved and erratic appetite.
   
3. The consumption of abnormally large amounts of casein by calves did not adversely affect growth or general appearance, but induced lethargy and occasionally digestive disturbances.
   
4. The most pronounced difference observed in the blood constituents of the two groups was in the plasma nitrogen, which was high in the calves receiving the protein-supplemented ration and comparatively low in the sugar-supplemented.
   
5. The results do not substantiate the postulate that milk proteins constitute the principal etiological factor in the disturbance of the mineral metabolism of milk-fed calves.
   

¹ Paper No. 1721, Scientific Journal Series, Minnesota Agricultural Experiment Station.

² Now at Clemson College, Clemson, S. C.