Since the mod was a recommendation, I simply had to fix the optical error. The struts of the auger were hanging in the middle of nowhere. That was improved.
Since it takes a while with the factory scripts (productions) and you can hardly do with 200 cows with compound feed. Was the idea why compound feed can not be bought.
The silo is a standard farm silo where you can simply buy TMR (mixed feed) for a small amount of money.
I know, not for everyone but a relief for me.