Looks pretty good but I would have mounted the gates higher on the posts.
Must not plan on having cattle in there as three plank wouldn't be enough
Looks like you got the ties dug in nice and straight
I'm no Veterinarian but they take blood from cows under the tail;
Horses from the neck. Cows are usually restrained in a squeeze chute but horses can react and sometimes violently. Those front feet can strike out very quickly