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Some Effects of Feeding Various Filled Milks to Dairy Calves. III. Blood Plasma Tocopherol and Vitamin A Levels, Diet Storage Effects, and Evidence of Toxicity¹

Department of Dairy Husbandry and Veterinary Pathology Section, University of Minnesota, St. Paul

ABSTRACT

Low blood plasma tocopherol levels were found in calves fed corn oil filled milk, despite a relatively high tocopherol intake. Both plasma tocopherol and vitamin A values declined progressively during the experimental period in the corn oil filled milk group. Low blood plasma tocopherol levels also occurred in animals fed lard filled milk and a ration containing butter oil, which was prepared from oxidized butter. Oral supplementation of the corn oil and lard filled milk diets with 500 mg. of DL-alpha tocopherol or alpha tocopheryl acetate daily resulted in high plasma tocopherol values.

A loss of 30–40% of total tocopherol content of the corn oil filled milk resulted during a maximum storage period of seven days. It was also demonstrated that an extremely high peroxide content developed in the corn oil tilled milk during a similar storage period. The feeding of a corn oil filled milk prepared daily rather than at weekly intervals markedly reduced the severity of the diarrhea and increased dry matter digestibility. Weight gains, however', were not materially affected.

The weekly prepared corn oil filled milk was found to be as detrimental for calves 4 mo. old as for younger animals. The possibility that corn oil filled milk is toxic to dairy calves is discussed in considerable detail.

¹ Scientific Journal Series Paper No. 4165, Minnesota Agricultural Experiment Station.

² Present address: Dairy Science Extension Section, The Pennsylvania State University, University Park, Pennsylvania.

³ Present address: Department of Agricultural Biochemistry, The Ohio State University, Columbus, Ohio.

⁴ Retired.