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The Effect of Carrier for Vitamin E on Liver Concentrations of Vitamin E and Vitamin E Excretion in Broilers^1,2

D. A. Lauzon^*, S. L. Johnston^*, L. L. Southern^*,3 and Z. Xu

^* School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge 70894; and Department of Food Science, Louisiana State University Agricultural Center, Baton Rouge 70894

³ Corresponding author: lsouthern{at}agctr.lsu.edu

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 -tocopherol concentration was not different (P > 0.10) between the sources of vitamin E in either experiment. Increased concentrations of vitamin E increased liver -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.

Key Words: vitamin E • broiler • verxite • silica • excreta

¹ Approved for publication by the director of the Louisiana Agricultural Experiment Station as manuscript number 07-18-0284.

² The authors thank BASF Corporation (Florham Park, NJ) for financial support and assistance with feed analysis. The authors also thank S. Powell, D. Dean, M. Roux, A. Jackson, and J. Tucker for assistance with data collection and laboratory analyses.