Exhibit (d)(5)(a) AMENDMENT TO SUB-ADVISORY AGREEMENT This Amendment is made as of August 19, 2003. The Sub-Advisory Agreement between Ohio National Investments, Inc. and Suffolk Capital Management, LLC dated May 1, 2002, is amended as follows:...

                                                               Exhibit (d)(5)(a)


                       AMENDMENT TO SUB-ADVISORY AGREEMENT

This Amendment is made as of August 19, 2003. The Sub-Advisory Agreement between
Ohio National Investments, Inc. and Suffolk Capital Management, LLC dated May 1,
2002, is amended as follows:

     Section 4 of the Agreement is amended to provide that no sub-advisory fee
     shall be paid to the Sub-Adviser with respect to either the Bristol
     Portfolio or the Bryton Growth Portfolio for the period from August 1, 2003
     through December 31, 2004.

In witness whereof, this Amendment has been executed by the parties hereto as of
the day and year first written above.


                                        OHIO NATIONAL INVESTMENTS, INC.


                                        By:  s/ Xxxxxxxxxxx X. Xxxxxxx
                                             -----------------------------------
                                             Xxxxxxxxxxx X. Xxxxxxx
                                             President



                                        SUFFOLK CAPITAL MANAGEMENT, LLC


                                        By:  s/ Xxxxxx X. Xxxxxxx
                                             -----------------------------------
                                             Xxxxxx X. Xxxxxxx
                                             President

Accepted and Agreed:
OHIO NATIONAL FUND, INC.


By:  s/ Xxxx X. Xxxxxx
     -----------------
        Xxxx X. Xxxxxx
        President


Amd-SubAdv-ONI&Suffolk