Rose comb semen deteriorates much faster than single or pea comb semen, in about 4 days compared to 10 or more with the others.
Where did you get this information & did it say why this would be the case?
The single comb is not a fault it's a disqualification.
I've read on here that there's a problem with fertility in rose combed breeds & that it's necessary to cross in something single combed to insure fertility. I've never heard this in the real world. Over the years I have raised several...