Light keeps rabbit from getting bored and depressed. Lighting is essential for reproduction in the winter months because of the length of the days. Rabbits need light to find their water and feed bowls. It can cause a buck to go sterile. It causes the buck to get bored.
Bucks love hot weather because they get lots of does to breed.
It can cause a buck to become very playful. Full feed which allows a rabbit to eat as much as it wants. Restrict Feed in which you control how much feed the rabbit eats each day. None of the above. The rabbit may not be eating because it is sick.