For those having fertility issues due to roo being lax on the job, I have found this method to be helpful:
1) Put lazy roo in a cage or pen alone where he can see another roo "working" . Roos are naturally competitive and watching another roo work (breed doesn't mater as much as effort, seeing a roo mount hens is the main goal) can often trigger a mating response when allowed to have hens of his own. On day one, worm him with Febendazole. Also at this time, select your test hens- no more then 3 to put him with, they should be submissive hens of any breed- the idea here is to check fertility right away, and give him success. Hens used for this should be confirmed fertile, and have not been w/ any other roos in the last 10 days.
2) Besides a good feed, give Kickin' Chicken roo booster, calf manna pellets, quality cat food kibble, and supplement feed with lots of fresh stuff/goodies- this helps to bring nutrition up to optimum levels and correct any hidden deficiencies.
3) Use a herbal supplement to bring up testosterone to as optimum a level as possible. I got this years ago for my Doberman, and have used it occasionally w/ my Favs.
http://www.revivalanimal.com/Mr-Stud.html
I do a daily dose in a syringe mixed w/ cod liver oil when handling for #4
4) Using AI techniques, collect from the roo daily and discard collection. As weird as this sounds, it accomplishes 2 very important things; it helps ensure that the pipes are indeed working properly, and it stimulates the roo into production of more sperm... injuring the dignity a tad will only serve to make him need to feel lord and master all the more when he gets his hens back.
Follow this method for 2 weeks. Then put him in a cage with the SUBMISSIVE hens that were selected for him in week 1. If he continues to shoot blanks after the described method, discard him and find a replacement ASAP
**also know your roo, if you know/suspect he is lax due to being in with a roo that beat the crap outta him every time he tried to mate, you need to make sure he only sees the "action" from a distance so the working roo doesn't make him feel even more of a pansy then he already is**