I have a few small fields I am rotating my cows and goats on. The fields are all recently recovered brushland and as such are very weedy. There is probably half or more weeds and less than half grass. And the weeds grow a lot faster than the grass. The cows and goats pick around many of the weeds and if I let them go the weeds will be huge shortly. I want to knock the weeds back but I also need enough forage for my animals. I was wondering if there was a rule of thumb to use untill my pastures get established. Like maybe mow whenever the weeds get up to knee high, or something like that. Thanks.