1 23 Journal of Physiology and Biochemistry Official Journal of the University of Navarra, Spain ISSN 1138-7548 Volume 68 Number 2 J Physiol Biochem (2012) 68:219-227 DOI 10.1007/s13105-011-0133-z Effect of calcium treatment on blood parameters, gonadal development and the structure of bone in immature female rats Natalia El-Merhie, Ismail Sabry & Mahmoud Balbaa