385.

Loercher K, Koeppe P, Akkilie M. Influence of EDTA on retention and biological half-life of manganese-54 and zinc-65 in chickens. Trace Elem. Metab. Anim., Proc. WAAP/IBP Int. Symp. 1969 (Pub. 1970); 259-263. (CA75) [No significant differences were noticed between the performance of chickens fed either EDTA supplemented or unsupplemented rations, or rations with different levels of Mn. The amt. of feed eaten to wt. gain ratio was unaffected by the addn. of 0.2% EDTA to the diet. Birds fed rations contg. 0.2% EDTA retained significantly more 54Mn and 65Zn, but this fact in itself does not signify a change in the biol. availability of the trace elements. Differences in 54Mn retention due to a variation in total Mn content of the feed were not observed when the Mn concn. of the ration was increased from 30 to 60 ppm. The use of EDTA as an additive to broiler feed seems to have little or no beneficial effects with respect to the metabolism of Zn and Mn. An increase in retention does not necessarily characterize biol. availability.]

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