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Diet and Supplemental Mineral Effects on Manganese Metabolism in Newborn Calves¹

Washington State University, Pullman 99163

Abstract

Heifers fed diets containing either 13 or 14 ppm manganese did not show significant differences (P>.05) in weight gain from heifers fed a ration containing 21 ppm manganese. Manganese supplementation of new born calves from dams that had been fed 21, 13 and 14 ppm manganese resulted in a 44-,97- and 115-fold increase in liver manganese concentrations compared to their nonsupplemented controls. The higher dietary manganese also caused a higher accumulation in muscle with no noticeable increase in hair manganese content. A higher concentration of manganese was detected in newborn calf tissue when their dams had received the higher level of manganese. Supplementing calves with manganese caused a significant (P<.05) increase in manganese concentration in their marrow-free bone. The addition of manganese to the milk diet of newborn calves did not significantly (P>.OS) affect their tissue concentrations of magnesium, phosphorus, calcium or zinc.

When ⁵⁴Mn was given to 2 newborn calves, the manganese supplemented calf had a higher fecal excretion of ⁵⁴Mn and less ⁵⁴Mn was retained in the tissue. Conversely, the calf receiving only milk had less fecal excretion and 5.5- and 23.5-fold higher ⁵⁴Mn activity in the liver and bone, respectively. These data suggest that manganese is preferentially absorbed under low dietary intakes. These data also suggest that the presence of high ⁵⁴Mn in the tissue of the nonsupplemented calf has a slower turnover rate and an opposite effect for the manganese supplemented calf.

¹ Scientific paper No. 3408 College of Agriculture, Washington State University, Pullman. Project 1816.

² Present address: Department of Animal Science, University of Alberta, Edmonton, Alberta, Canada.

³ These data are a portion of a Ph.D. thesis by the senior author, Washington State University.

⁴ Appreciation is expressed to Moorman Manufacturing Company, Quincy, Illinois, for partial support of this work.

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