@ARTICLE{Afsharmanesh, author = {Afsharmanesh, M. and Pourreza, J. and Samie, A. and }, title = {Effect of Different Levels of Calcium and Vitamin D3 on Eggshell Quality Traits}, volume = {5}, number = {2}, abstract ={This experiment was carried out to study the effect of different levels (3.06, 3.23, 3.4, 3.57 and 3.74%) of calcium and vitamin D3 (2000, 2200 and 2400 IU/kg diet) on eggshell quality of laying hens. In a completely randomized design and in a 5×3 (15 treatments) factorial arrangement, two hundred and forty (240) white leghorn laying hens, strain Hy-Line W36 and 26 weeks old, were divided into 60 replicates, four hens per replicate. The experimental period lasted 90 days until the hens were 38 weeks of age. The results indicated that shell strength, shell thickness and shell percentage increased significantly (P }, URL = {http://jcpp.iut.ac.ir/article-1-194-en.html}, eprint = {http://jcpp.iut.ac.ir/article-1-194-en.pdf}, journal = {Journal of Crop Production and Processing}, doi = {}, year = {2001} }