Hi, I am new to the poultry world. I have 2 baby turkeys (pets, not to eat..don't hold it against me). What does feeding greens mean? Should I pick some grass (they are still in a 100 gallon horse trough bedded with straw)..give them alfalfa (I have horses so I do have that on hand).. How long do I keep them under a lamp? Thank you!!!!