FORM OF SECTION 906 CERTIFICATION

                                                              EX-99.906CERT MAIL

Michael S. Daubs, President, and Mary E. Hoffmann, Treasurer, of Ultra Series
Fund (the "Registrant"), to the best of their knowledge, each certify that:

1.   The Registrant's periodic report on Form N-CSR for the period ended
     December 31, 2005 (the "Form N-CSR") fully complies with the requirements
     of Section 15(d) of the Securities Exchange Act of 1934, as amended; and

2.   The information contained in the Form N-CSR fairly presents, in all
     material respects, the financial condition and results of operations of the
     Registrant.

PRESIDENT                               TREASURER


/s/ Michael S. Daubs                    /s/ Mary E. Hoffmann
- -------------------------------------   ----------------------------------------
Michael S. Daubs                        Mary E. Hoffmann

Date: February 20, 2006                 Date: February 21, 2006