FARKLI D‹ZEYLERDE KALS0YUM VE FOSFOR 0«EREN YUMUR TA TAVUU KARMA YEMLER0NE BOR 0LAVES0N0N YUMUR TA M0NERAL 0«ER0KLER0 ‹ZER0NE

* In this study, effects of boron supplementation to layer diet containing different levels of calcium and phosphorus on mineral levels of egg were investigated. The experiment was lasted for 20 wk period using 576 laying hens of commercial white strain (Nick chick) at 46 weeks of age. Two dietary calcium and phosphorus levels (standard and low) and three supplemental boron levels (0, 75 and 150 ppm) were the variables in the present study. Consequently, 2x3 factorial arrangement was designed. As the supplemental boron dose was elevated, boron level in edible portion of egg was increased. The supplementation diet with 150 ppm boron induced a 2.5 fold increase in the boron content of edible egg portion compared with the unsupplemented group. Dietary Ca and P deficiency signifi cantly increa sed boron in the egg shell. Decreasing the level of feed Ca-P resulted increase in boron accumulation in the eggshell and decreased the retention of Ca and P in the edible egg portion. Boron supplementation to Ca-P deficient diets increased Ca and P level in the edible egg portion, and comparable to that of standard Ca-P diets. Ash levels and Mg, Fe, Zn and Cu contents of the egg shell and edible egg parts were not influenced by diet Ca and P level or boron supplementation (P>0.05).