Suplementação com levedura de crômio eleva a concentração sérica de crômio em bovinos

This study evaluated the effect of daily chromium supplementation at growing doses on serum Cr levels in cattle. Sixty Nellore heifers 2 to 5 years old were randomly assigned to one of four groups (15 heifers/group) fed non-fertilized Brachiaria decumbens pasture. In the control group (Gc), the heifers received a mineral mixture without Cr. In the other groups, heifers received 0.59, 1.19 or 2.38 mg Cr +3 /animal/day, groups G 8.5 , G 17 and G 34 , respectively. Blood samples were collected on days 0, 30 and 60. Serum concentration of chromium was determined by graphite furnace atomic absorption spectrophotometer. The chromium source used was the chromium yeast. The results do not support any significant difference (p>0.05) among serum chromium levels of heifers in groups Gc, G 8.5 , G 17 and G 34 at a same observation day. Only effect of supplementation time was detected in group G 34 . In this group there was significant increase (p0,05) na concentração sérica de crômio das novilhas entre os grupos Gc; G 8,5 ; G 17 e G 34 , num mesmo dia de observação. O único efeito obser- vado foi do tempo de suplementação com crômio no o grupo G 34 . Neste grupo a concentração sérica de crômio apresentou aumento significativo (p