"Within the ovary are all the eggs the llama/alpaca will have during her lifetime. The vast majority of these eggs (primary follicles) will never develop, while a few will develop into more mature secondary follicles. A few of the secondary follicles will develop even further into mature Graafian follicles, fluid filled structures up to a quarter of an inch in diameter. The Graffian follicle contains the mature egg that can be fertilized following ovulation. If ovulation doesn't take place, the follicle will degenerate and be replaced by another follicle."(Dr. Brad Smith)