Instead of breeding them on the ground, maybe you should consider AFK breeding towers. There is a lot of how-to videos on YT. Just search for vertical or tower breeders. It is difficult to make them and even to feed animals... but once you succeed, you will have a ton of meat in a few hours. I usually drop foods for each boar/wolf and make sure they are eating. Then i make myself a coffee and scroll on facebook or watch some videos on YT for 30-60 minutes. When i come back, there are gazillions of piglets and my FPS is around 10 :)
The whole time i have my headset on so i can hear if something is going on in the game. If i hear raid i quickly jump in, clear it and then go back to scrolling facebook :)
Vertical breeders are safe from raids. Well, mostly safe. Flying rats and drakes can do a lot of dmg if you don't react in time.
Here is my concept of AFK boar breeding tower. I usually have boar and wolf towers nearby so they can both breed at the same time. And it is always far away from main base due to FPS issues.
https://steamcommunity.com/sharedfiles/filedetails/?id=2725959451