Not really. I'm pretty sure 18% is generally recommended for male rats and around 20% for females and hairless. 22% - 24% is actually pretty decent for a breeding/nursing female and a troop of wild babies. The males aren't as important in a colony to me, and I'd rather have my breeder females get adequate protein than not enough because I'm trying to cater to the males' level of protein. It just doesn't make sense to me to feed a diet tailored to male rats when your colony is mainly breeding females and their young.