Effects of high temperature on production in layer chickens supplemented with vitamins C and E(Efectos de la alta temperatura sobre la producción en gallinas ponedoras suplementadas con vitaminas C y E)

-tocopherol acetate/kg of diet (Group Vit C + E). Results. Egg/bird were higher (p<0.05) in all treatment groups when compared to control group, but p value was highly significant in vitamin E treated group. Likewise, the laying index was different (p<0.05) in all treatment groups when compared to control, and P value was highly significant in vitamin E treated group. Although, viability was not affected by vitamin C, vitamin E and vitamin C+E groups when compared to control (p>0.05). However, feed consumption and conversion were different (p<0.05) in treatment groups when compared to control group. Conclusions. Dietary supplementation with 150 mg vitamin C and/or 150 mg vitamin E increased production performance in heat stressed layer chickens.