Only breed I never had any luck with were Charlois. They were as wild and aggressive the day we put them on the trailer for market as the day we unloaded them. Had two of them, and they would attack you if you got in the field and then flee through fencing!!! A neighbor who had a nice herd sold them to me and I know he was quiet and gentle with his cattle.
Too late to dig the dog fennel (Eupatorium capillifolium (Lam.) Small) out this time of year. Seed formation and runners have already begun and unless it is very soft soil it would be near impossible to get it all and disturbing the soil will only permit and encourage new seedlings to emerge.I second getting rid of the tall greenery in the background of your picture.