From 1.05 changelog:

Deploys the Bovine Defense Force Initiative.

What the heck is that, lol?

Cow farts that you set on fire is my guess.

Exploit fixing

https://www.youtube.com/watch?v=I__N6foEE1E

If you kill enough cows, then an unknown level chort will spawn and beat your ass down.

Lol, I'll never try to roast a cow! :D

I had to kill the cows to see this a lvl 27 Chort spawned and started killing the ppl in the town ( non-quest related ones )
Was no match for my char as im lvl 44 and was a great way to farm monster parts as they just keep coming.

An FYI for those looking for this I tried it in several areas and it seems to only work in White Orchard, likely mainly as a troll to people playing a new game trying to stock up on food.

Also for them adding this in a patch it seems bugged or broken by design. You can get him to spawn but then the issue is every time you kill it another spawns in the same area if you stay near the area you killed the cows. In addition to that he will just circle the area of the dead cows, if you fight any past the first one in that area that will flat out ignore you and continue to walk in circles only leaving the area a little gets them to fight you and going farther away than that gets them to stop spawning.

All this combined means the area becomes unusable for you if you happen to be able to beat it then save without a previous save as you will always be in combat mode in that area.

This may not happen to everyone but I saved prior to every attempt at getting this guy to spawn and after getting him to spawn and see this issue I was able to recreate it every time I loaded that save and even after completing another quest then trying again before calling it quits.

Seriously? You can see the level? Mine its "??" an unknown level enemy but it appears as a water hag.

For me I did it in the same area and got the same monster as what is shown in the video. For me the guy was level 27 and I could wipe the floor with them at level 17 highest difficulty speced with signs.

Which leads me to what I believe is another bug, those guys are super weak to fire. At level 17 a quick blast of Igni did almost 4k damage and the flamethrower alt did more, didn't add up what the flamethrower did. For that guy that was about 20% of his health.

making so much money off selling stuff these mobs drop got more than i know what to do with bad idea putting this in great exploit for higher level characters.

What on earth? Cow King in Witcher? And it doesn't even drop set items...

This is now an even greater exploit as you can drag it through the village killing the respawning merchants/blacksmith and loot their bodies.