Corresponding Author: A. Khaksefidi. Tel: +98-1722225021-2,
Fax: +98-1722224060, E-mail: Khaksefidi_A@yahoo.com
1
Department of Poultry Science. College of Agriculture, Tarbiat
Modarres University, Iran.
Received September 22, 2004; Accepted February 14, 2005