Abstract
An experiment was conducted to determine the effects of dietary supplementation of yeast Rhodotourula glutinis(Glutincus) on the performance and egg quality of layers. A total of 360 ISA Brown layers of 72 weeks old were assigned to one of the following 6 diets ：control, 25 ppm ${\beta}$-carotene. 0.5％, 1％, 2％ and 4％ Glutinicus supplemented diet. Each treatment was replicated three times with 20 birds housed in 2 birds cage units. Glutinicus supplemented at the level of 0.5％ significantly(p＜0.05) improved egg production and FCR. Soft and broken egge production rate decreased as the level of Glutinicus supplementation increased. Eggshell was highest in Glutinicus 4％ supplementation. Egg yolk color increased linearly as the level of Glutinicus supplementation increased up to 2％ of the diet. It was concluded that Glutinicus supplementation at the level of 0.5％ can be recommended for the improvement of egg production while 2.0％ can be recommended for egg yolk pigmentation.