Intisar K.Saeed, A.I.Khalafalla, S.M.El Hassan and M.A.El Amin
Journal of Animal and Veterinary Advances 3 ( 6 ): 361 - 365 , 2004
O.M.El Hassan, A.I.Khalafalla and S.M.El Hassan
Journal of Animal and Veterinary Advances 3 ( 6 ): 384 - 387 , 2004