fertility in old birds

[keystonepaul]

Well I have a cock as part of a package- thrown in for free due to his age- He'll be 14 in January or so. I've read some threads here, articles other places, etc, etc, etc on how to improve/maintain fertility. He's supposed to be still filling eggs. He's got a lot of charecter and..we'll...if he's not able to fill eggs... it seems no one's told him yet. Anyway- I'll be starting my pre-breeding program- increasing protien, calcium, etc in advance of breeding him. and am wondering if anyone has a "process" or a "system" they use for increasing or maintaing fertility. I've read various threads,etc, and have my vit. E, yeast, etc. but I'll really be creating my own systematic method so to speak and am just wondering if anyone here can share thier steps for maintaining/increasing fertility. (of thier pigeons) The threads here and other places basicly just offered thoughts on "try this." or "this aids in fertility"
etc. Thanks, Keystonepaul