Jeanne - Simme Valley
Well-known member
I am just pointing out that using a bull for 35 days is a lot different than 100% AI for even 60 days. When people run a bull for a normal 60 day calving season, and they have open cows, then yes, fertility is a problem - either the bulls or the cows.
You have to have some really fertile cows to maintain a calf a year with 100% AI or embryos - even if you have a split spring & fall.
You have to have some really fertile cows to maintain a calf a year with 100% AI or embryos - even if you have a split spring & fall.