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Over the years with my Brahma projects I've used predominately cockerels. Not for fertility reasons, but more hopefully they were a step closer to my breeding end goal than their predecessors. The only exception to this that I can think of was last years blue laced red breeding pen, where I used a old red male, to increase size, trying to compensate for the Wyandotte influence. Now this old male(probably 6-7years old) was not the only male in the pen, but did produce chicks.
I ussually use a flock mating approach, often using multiple males. If your pens are big enough, and the breed involved has the temperment for it, there can be advantages. Never underestimate the value of a little competition to inspire the boys to take care of business.
I've known some old Cornish breeders that swore by the old saying that a Cornish cock needed to feel the sun on his back before he was much good in the breeding pen. These same fellas would usually mate their cockerels with hens, and their old cocks with pullets. Because of their game nature they had to use a single male per breeding pen, but would often put pens near each other. If fertility was an issue they would sometimes switch birds between pens, ussually resulting in increased activity. Now if the issue is low sperm production, rather than delivery, none of this is going to do you much good.