I am wondering how often you should change out your productive rooster. I was told by an older family member that it should be every 2 years. I know hens lay well for about 2.5 yeasrs. What about your rooster? Should you be keeping one of his offspring in the wings so to speak? Let me know your opinions please? This year (2009) will be the first year that I will be keeping roosters for fertilizing my eggs. Thanks for the help.