Why might ranchers not want to adopt wildlife-friendly practices

Farmers and Ranchers for the most part live off their property. That's how everyone gets food. They need to determine within meat cows what meat cows stay alive longer for beef and which ones get killed young for veal. I chose cow because that's the best one that has different killing times. If it wasn't about the animals only living until age for market they would have no money to survive. Animals give them more money than the crops.