This is my first year on ducks, chickens 9 years, anyway I got Khaki Campbells, and Pekins on the first week of March, so they are 4 months old now, yesterday I saw the Khaki Campbell males trying to breed the females, so they must be close to egg laying, So my question is how can you tell when the duck is old enough to lay? I free range them, and can they be train to lay in the coop like chickens? Thanks for the help!