Exactly hens are female that would mean no roosters. I said if they used words like chicken poultry or fowl. You are exactly right wording has everything to with it. Read through your ordinance very carefully.
If it doesn't say anything specific to roosters it means they are included in whatever wording they have for chickens poultry fowl or whatever other words they chose to describe. Their may be a spot in the ordinance stating at no time shall they be a nuisance or shall a nucience be a allowed to...