Are rose combs dominant or recessive?

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Because i have 30 hens (and plan to get more this spring) and want to ensure fertility, and my hens are EE, production red, white leghorn, black australorp, modern game, OEGB, black langshan, and white cochin (all hatchery quality)
 
it depends on how many more hens you plan to get, if you birds are free-range, one roo for every 20 to 30 hens should be fine as long as your roos are healthy and active.
 
The semen of homozygous rose comb males,R/R only lives for about 4 days in the hen.
Heterozygous rosecomb males R/r+ are more fertile because the single r+ component usually has at least a 14 day,often to 21 day, life.
If you find fertility is low, you will either have to add more rosecomb males or switch to pea comb males.
 
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Ok interesting, so is that why I've heard Rose Comb bantam breeders say to use the occasional single combed rooster for more fertility?
 

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