AU - M. Pakdel, AU - J. Pourreza, AU - S. Ansari, TI - Effect of Different Levels of Dietary Calcium and Available Phosphorus on the Performance of Isfahan Native Breeder Hens PT - JOURNAL ARTICLE TA - JCPP JN - JCPP VO - 7 VI - 3 IP - 3 4099 - http://jcpp.iut.ac.ir/article-1-452-en.html 4100 - http://jcpp.iut.ac.ir/article-1-452-en.pdf SO - JCPP 3 AB  - In a 3×3 factorial experiment, 90 72-week-old native breeder hens of Isfahan were kept in cages (one bird/cage). The effect of three levels of dietary calcium (3.27, 2.62, and 1.96%) and three levels of dietary available phosphorus (0.25, 0.20, and 0.15%) on egg production and egg shell traits were investigated. Each treatment contained five replicates of two birds (10 birds per treatment). The experimental diets were fed 8 weeks (from 72 to 80 weeks of age). Dietary calcium and available phosphorus levels had no significant effects on feed consumption, shell thickness and shell breaking strength. Decreasing dietary calcium or available phosphorus levels (1.96% calcium and 0.15% available phosphorus) caused a significant (P CP - IRAN IN - LG - eng PB - JCPP PG - 163 PT - Research YR - 2003