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.
Retired in 2005, breeding Araucana chickens. Most store bought eggs have a best before date on the carton but 30 days is usual. You do not need to throw out eggs older than that, just do a float test. Put the eggs in a bowl of water and throw away any that float to the surface, boil up the rest and use for lunches etc. 3 people found this useful.