They can cycle about every 120 to 130 days. It seems like they can be slowed down and even prevented from producing eggs by controlling the husbandry and especially the diet and temperature to some extent. It seems like this prevents the follicles from ovulating or lessens the number that ovulate.
Overfeeding constantly will likely make them produce large clutches, can lead to egglaying issues, constipation and even prolapsing and MBD.