Everything we read regarding rooster to hen ratio varies from 10-14 hens to one rooster. My presumption is that ratio is to make sure all the hens are successfully mated. 
However, I wonder if too many hens can be detrimental to a rooster? I have one cockerel and 37 hens/pullets. I am not concerned if he is breeding them all or not, I just wonder if there is the possibility of either his health being put at risk (due to over exertion) or of him being injured (not so much I don’t guess since there is no appendage to break).
In the grand scheme of things I know this has no relevance, but I am that kind of person who wonders about everything. And I will say my wondering has taught me a lot.
FWIW, every egg I have cracked is fertile.
	
		
			
		
		
	
				
			However, I wonder if too many hens can be detrimental to a rooster? I have one cockerel and 37 hens/pullets. I am not concerned if he is breeding them all or not, I just wonder if there is the possibility of either his health being put at risk (due to over exertion) or of him being injured (not so much I don’t guess since there is no appendage to break).
In the grand scheme of things I know this has no relevance, but I am that kind of person who wonders about everything. And I will say my wondering has taught me a lot.

FWIW, every egg I have cracked is fertile.
	
 He is mixed so I’ll only use his offspring for my meat and eggs. Later on I do plan on bringing in a purebred cockerel chick to place under a broody. My plans will be to keep him up in a trio. 
 Thank you for your response.
 I honestly don’t have a clue how I even remembered that. Usually it is a long drawn out joke with the rooster mating everything in sight until there is nothing left to mate.