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Effect of Diet and Manganese Level on Growth, Perosis and ⁵⁴Mn Uptake in Chicks¹

Poultry Department, University of Tennessee, Knoxville, Tennessee, and Agricultural Research Laboratory of the University of Tennessee, Oak Ridge, Tennessee⁴

Broiler-type chicks were used to study the effect of graded levels of manganese in a purified diet and in two practical-type diets (one without and one with 14.5% feather meal) on growth, incidence of perosis, the in vivo uptake of ⁵⁴Mn by certain tissues and in vitro uptake of ⁵⁴Mn by erythrocytes. Generally, growth was unaffected by the manganese levels except that chicks fed the purified diet containing no added manganese achieved very poor growth. The incidence of perosis was decreased by manganese additions but was not eliminated. An inverse relationship was observed between dietary manganese and the percentage of ⁵⁴Mn taken up by liver, kidney, spleen and muscle. The first added increment of manganese in the diet had the greatest effect in reducing the uptake of ⁵⁴Mn by intramuscular dose. The inconsistent ⁵⁴Mn tibia uptake was probably affected by bone size. Erythrocytes incubated with ⁵⁴Mn took up some of the isotope, but the amount failed to reflect the manganese content of the diet. No appreciable amount of manganese appeared to be tied up by the feather meal diets as evidenced by tissue and excretion data.

² Present address: 2525 S. Sheridan #22, Denver, Colorado 80227.

³ Present address: Agricultural Extension Service, Poultry Department, University of Tennessee, Knoxville, Tennessee.

⁴ Agricultural Research Laboratory which is operated by Tennessee Agricultural Experiment Station for the U.S. Atomic Energy Commission under Contract no. AT-40-1-GEN-242.

Manuscript received 29 May 1968.