When this happens, the thyroid gland is no longer under pituitary control. The amount of hormone it produces is dependent on levels of TSI. TSI are the direct cause of hyperthyroidism in Gravesâ disease and various immune system chemicals known as cytokines also contribute to the symptoms that occur in this disorder.
Confidence votes 20. Female Iguanas will lay eggs when they become sexually mature, which is around 1.5 to 2 years old. They do not need to be fertilized to lay so therefore do not need a male Iguana. They need to be healthy before they lay or else there can be very serious problems.
Lovebirds reach maturity between six months to a year and are then ready to mate. Lovebirds begin to lay eggs five to 12 days after mating, usually one egg every other day. The size of the clutch is generally between three to seven eggs. Incubation time is about 23 days for each egg. Female lovebirds also lay eggs when there is no access to a male lovebird, although these are not fertile eggs. Separation from other birds curbs excess egg laying. In addition, placing the cage in a dark room imitates the short days of winter, when mating does not occur.