Iowa Code § 580.4: Affidavit of foreclosure.

Liens may be enforced by the holder filing with the sheriff of the county in which the progeny is kept, an affidavit which shall, in addition to a demand for foreclosure, contain:

1. A description of the stallion, bull or jack, when used and of the dam and its progeny.

2. The time and terms of said service.

3. A statement of the amount due for said service.