ALTER4: Pens
6 min
The ALTER4: Pens option allows you to manage your DairyComp pens or to view a historical pen inventory. You can create new pens, and also delete, rename, or change (ALTER) them.
To open the Pens List window, enter ALTER in the command line, then select [4] Pens from the menu. Alternatively, you can enter ALTER\4 directly in the command line.

When setting up your pens, DairyComp can automatically record the date when an animal enters a pen. This helps accurately reflect an animal's reproductive or health status. For example:
- BULL Pens: Recording the move-in date for a BULL pen helps you estimate conception dates. See BULL Pen and Pen Change to learn more.
- AI Pens: Many dairies only enroll animals in breeding or sync programs when they move into an active AI pen (AIPEN>0). Recording this move-in date is important because it allows you to:
- Enter BREDSUM AIDAT\Y in the command line to quickly see your BREDSUM analysis and monitor key metrics like reproductive performance, conception rate, and pregnancy rate.
- Enter BREDSUM FOR AIPEN>0 in the command line to filter your BREDSUM analysis to include only animals that have moved into AI pens.
- Create more flexible and future-proof command abbreviations using ALTER\3, because the AIPEN>0 filter automatically includes all animals in any AI pen. This eliminates the need to manually update your abbreviations whenever a specific AI pen number changes or a new one is added. See AI Pen and Heifer AI to learn more.
Expand the sections below to learn more:











