TY - JOUR ID - 20618 TI - Effect of Substitution of Corn with Different Levels of Wheat along with Supplemental Phytase and Different Levels of Available Phosphorus on Layer Hens Performance JO - Iranian Journal of animal Science JA - IJAS LA - en SN - 2008-4773 AU - zartash, leyla AU - zare shahneh, ahmad AU - zali, abolfazl AU - gaykani, rooh-o-lah AU - poor reza, javad AD - Y1 - 2009 PY - 2009 VL - 40 IS - 1 SP - EP - KW - Available phosphorus KW - Laying Hen. KW - Phytase KW - Substitution KW - Wheat DO - N2 - The present study was carried out to investigate the effect of corn replacement by different levels of wheat with supplementation of phytase with reduced phosphorus level for laying hens. Two hundred seventy nine layer hens (the strains of Hy-line W36) at the 53th week of age, selected based on the same egg production percentage and body weight, assigned in a factorial arrangement with completely randomized design of 30 treatments each in 3 replicates. The factors included 5 levels of replacements (0, 25, 50, 75, 100% replacement of corn by wheat), phytase enzyme in three levels (0, 500, 1000 ftu/kg) and two levels of non phytate phosphorus (0.70% and 0.55% requirement) along with one corn soybean meal control diet. The experiment was carried out at 3 periods, each of 28 days. Egg production percentage, egg weight, feed conversion ratio, shell percentage, shell strength, shell thickness and toe ash were assessed. The results indicated that the effects of substitution wheat on egg production, Feed Conversion Ratio (FCR), shell strength, shell thickness and toe ash were significant (P UR - https://ijas.ut.ac.ir/article_20618.html L1 - https://ijas.ut.ac.ir/article_20618_fb2d6a2c1702465207116c6ee6af3d64.pdf ER -