The effect of carrier for vitamin E on liver concentrations of vitamin E and vitamin E excretion in broilers.

Two experiments were conducted to determine the effect of 2 carrier sources of vitamin E on growth performance and excreta and liver vitamin E concentrations of broilers. Chicks were pretested from d 0 to 7 posthatching on a corn-soybean meal diet without vitamin E supplementation, and the experiments lasted from d 7 to 19 posthatching. Each treatment in both experiments was replicated with 6 pens with 5 chicks each. Initial and final BW were 155 and 684 g in experiment 1 and 155 and 691 g in experiment 2. In experiment 1, the dietary treatments were the corn-soybean meal diet with varying concentrations (0, 30, 100, or 300 IU/kg) of supplemental vitamin E either absorbed to verxite (VE) or adsorbed to silica (SE). In experiment 2, the dietary treatments were the 0 and 30 IU/kg of vitamin E as VE or SE. In experiment 1, feed intake decreased and gain:feed increased as concentration of VE increased, but feed intake increased and gain:feed decreased as concentration of SE increased (source x concentration, P < 0.03). Gain, feed intake, and gain:feed were not affected (P > 0.10) by the vitamin E carrier source in experiment 2. The mean excreta vitamin E concentration at d 7 posthatching was 17.2 IU/kg (DM basis). The percentages of vitamin E excreted were based on analyzed vitamin E concentrations in the diet. At 100 and 300 IU/kg of supplemental vitamin E, an average of 94 and 44% of vitamin E intake from broilers fed vitamin E from VE and SE, respectively, was excreted (vitamin E source, P < 0.01; source x concentration, P < 0.08), but at 30 IU/kg of vitamin E, 49 and 45% of vitamin E intake from broilers fed vitamin E from VE and SE was excreted. In experiment 2, 52 and 43% of vitamin E intake from VE and SE was excreted (source, P < 0.02). Liver alpha-tocopherol concentration was not different (P > 0.10) between the sources of vitamin E in either experiment. Increased concentrations of vitamin E increased liver alpha-tocopherol concentrations (P < 0.01). On the basis of the results of excreted vitamin E, vitamin E adsorbed to SE was more available than vitamin E absorbed to VE, but on the basis of liver vitamin E concentration, their availabilities were similar.