I am planning on planting a small plot of alfalfa in our cow yard. I dont want to fence it off, but have read quite a few posts about cows eating new growth grass (under 4" tall) and getting teatany. Is this something I should worry about and avoid her eating the alfalfa until it is over 4" tall (in other words going through the hassle of fencing it off?) or is it just with new growth native grass? Thanks for always being there to answer all my newbie questions.