I had a stock bird (cock) for about 13 months. He was a year old when I got him. He got out of the stock aviary and left. His hen was on eggs for about a week and they had raised a total of 8 other youngsters. He never came back. I had another pair of pigeons on eggs for the same time, so I swapped out the eggs. I wanted another set of youngsters from the flown cock.