Eggs can be obtained by harvesting a Chicken (of any breed) or be received as a gift. 4 Eggs are required to complete a set of ingredients for the Wedding Task to trade for favor points. When a farmer finds Eggs while harvesting a chicken on their farm, it will automatically add 5 eggs to their Wedding Tent each day, regardless of how many chickens are harvested. They were available in the market through July 6th,2010.
The chickens inside the Chicken Coop doesn't produce Eggs as ingredients.