Barn Cards are valuable in managing in conventional barns where cows go in the same stall all the time. The owner (or a potential cow buyer) can quickly see each cow's lifetime production history. Barn Cards are an Optional Report. When an AgSource member signs up for this option, they receive a Barn Card for each milking cow in the herd. Whenever a cow finishes her lactation, a new Barn Card is sent for her. A new card also is provided for each heifer that freshens and for purchased cows when they enter the herd.