Diet and Supplemental Mineral Effects on Manganese Metabolism in Newborn Calves

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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. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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