Plasma Mn Research Articles

Effect of high dietary Mn levels on the growth rate and the level of mineral elements in the plasma and soft tissues of sheep

Abstract Sixty grazing Romney Marsh sheep (30 ewes and 30 wethers) were randomly placed in three groups and supplemented with 0, 250, and 500 mg Mn per day to study the effect of high dietary levels of Mn on growth rate and levels of mineral elements in various soft tissues. Increasing the dietary level of Mn significantly depressed the growth rate of the sheep. There was little effect on the mineral element composition of plasma, heart, kidney, and liver, except in the first experiment, where the heart and plasma Fe levels were decreased while the liver Cu and Mn levels and plasma Mn levels were increased.

The influence of different Ca and P supplies on the vitamin A, Cu and Mn status of young cattle with additional effects of growth and season.

Six 9-month-old female Dutch Friesian cattle were given hay and pelleted concentrates with added 130 g CaCO3 or 100 g Na2HPO4 daily for periods of 50 days each. The supplements did not significantly influence growth or vitamin A, Cu or Mn in liver or blood plasma, although more P tended to retard growth. Liver vitamin A, Cu and Mn generally decreased significantly with time. Cu was more closely related to growth than vitamin A or Mn. A fall of Cu in blood plasma and liver was associated with a fall in the vitamin A in liver and with an increase of vitamin A in plasma.-V. J. B. (Abstract retrieved from CAB Abstracts by CABI’s permission)