Re-evaluation of calcium and phosphorus requirements in aged laying hens.

@article{Bar2002ReevaluationOC,
  title={Re-evaluation of calcium and phosphorus requirements in aged laying hens.},
  author={Arie Bar and V Razaphkovsky and Eliaho Vax},
  journal={British poultry science},
  year={2002},
  volume={43 2},
  pages={261-9}
}
1. A series of 5 trials was conducted with 401- to 650-d-old Lohmann, Yafa (local breed with brown eggshells) and Yarkon (local breed with white eggshells) hens fed for 56 to 84 d with diets containing 25 to 50 g/kg calcium (Ca) and 4.5 to 7.6 g/kg phosphorus (P). 2. Increasing dietary Ca from 24-25 to 36-40 g/kg improved egg production, shell weight (SW) and shell thickness (ST), and decreased mortality. 3. Increasing dietary Ca to 48 to 50 g/kg did not affect egg production but increased SW… CONTINUE READING