| Popis: |
ONLY limited data have been published concerning the young turkey’s dietary manganese requirement. Mussehl and Ackerson (1939) fed poults a basal diet containing 35 parts per million (p.p.m.) of this element. Manganese carbonate and manganese sulfate were added in quantities to provide 35 and 350 p.p.m. of the element, respectively. There was no significant improvement in the growth rate in lots receiving added manganese; in addition, there were no observable cases of perosis. Poults tolerated 350 p.p.m. of added manganese without negative response. Ringrose et al. (1939) supplemented a low-manganese (10 p.p.m. or less) basal diet with 20, 40, 60 and 80 p.p.m. of the element as manganese sulfate. The experiment was conducted with Bronze poults from day-old to eight weeks of age. The incidence of perosis was gradually lowered and growth rate was increased with 20 p.p.m. or more of added manganese. Perosis was not entirely prevented with any … |
