I taught a school in Faith South Dakota at the Wedge Tent Ranch owned by Bart and Shannon Carmichael on October 2nd and 3rd. Clay was one of the attendees and scheduled an interview after the school was over.
You can listen to that interview HERE
The interview centered around commonalities of old fertile cows.
1) Glandular function, 2) butterfat indicators and 3) wedge shape and what those things look like.
I hope you find something useful in the interview.