J. Anim Sci.
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J. Anim Sci. 1971. 32:364-367.
© 1971 American Society of Animal Science
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Response of Lactating Dairy Cows to High Levels of Dietary Molybdenum1

J. T. Huber2, N. O. Price and R. W. Engel3

Virginia Polytechnic Institute,,4 Blacksburg 24061

Abstract

Lactating dairy cows were fed a basal ration containing 6 ppm of copper to which from 53 to 300 ppm of molybdenum (Mo) were added as sodium molybdate. Sulfate was also an experiment variable in one trial. Overt symptoms of Mo toxicity (diarrhea, inanition, etc.) were observed in three cows consuming 173 to 200 ppm Mo, but in none of the cows receiving 53 to 100 ppm. Marked decreases in liver copper (Cu) and increases in milk Cu were noted at all levels of Mo. Blood Cu was not altered by treatment. Liver, blood and milk levels of Mo were increased 5- to 10-fold, and were somewhat proportional to Mo intakes. Added sulfate exerted a depressing effect on liver and blood concentrations of Mo, but had no consistent effect on liver Cu.

All cows were sacrified and various tissues were analyzed for mineral levels. High levels of dietary Mo tended to increase kidney Cu, while liver Cu was decreased. The kidney and spleen apparently concentrated the Mo at concentrations several times higher than those in the liver. Iron concentrations in the tissues were not affected by high dietary intake of Mo.

Footnotes

1 Partially supported from funds provided by the Nutrition Foundation, New York, N. Y.

2 Present address: Dairy Department, Michigan State Univesity, East Lansing.

3 Associate Dean of Agriculture, formerly Head of the Department of Biochemistry and Nutrition.

4 Department of Dairy Science and Department of Biochemistry and Nutrition.






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Copyright © 1971 by the American Society of Animal Science.