Well the spring kidding/lambing is intended to have your ewes/goats hitting the best grass (apring-june) while lactating - and- when the kids/lambs are just starting to eat grass as well it will be at its highest protein content and palatability.
But, since you're in AZ, you may not have to manage grass and are importing all your feed anyhow. I would avoid calving, lambing, kidding, hatching in the dead of winter unless you are really set up for it.
But, since you're in AZ, you may not have to manage grass and are importing all your feed anyhow. I would avoid calving, lambing, kidding, hatching in the dead of winter unless you are really set up for it.