Why pollarding is a great way to manage fodder trees
GOOD OPTIONS: mulberry, willow, poplar
Pollarding is cutting your tree down and leaving a tall stump to regrow. It is similar to coppicing which cuts a low stump (near ground level), but pollarding is where you cut it higher (about shoulder height) so the new growth is above grazing height.
You want to cut in summer to supply fodder, so ensure your tree is mature and established enough to regrow the following spring. Fully pollard only every 2-6 years, or alternatively remove 50% of the branches each year.