My husband worked for a large cattle feeding operation years ago and that is what the man that owned it would say to people who commented on the smell. He said he didn’t smell anything but money when he was at the yards.
I recognize that is your husband’s livelyhood, but here in the Yakima Valley it stills smells like shit. At one time we had over 60,000 dairy cows and feedlot cattle in a very small area. The air would be so thick that you could see the cloud of dust and vapors just hanging low over the valley.
The problem is these farms never had a manure management plan and just allowed it to build up. So their current 0kans are to liquefy it and spread it on their crop fields ir spread the dry matter. That gets really intense but only for a few days.