I've been doing some extensive study on chicken genetics, it is really fascinating! The buff gene is actually a little bit of a mystery, I haven't found anyone that has figured out how the last bit of black has been eliminated to make a truly buff bird. I don't have any buffs, but I know from some brahma breeders that they tend to be a little difficult in temperament compared to most other colors of brahmas. Brahmas are a Columbian patterned buff, not a true no black buff. Similar to my darks (which are really silver penciled) whose temperaments are very different from my gold partridge (wild type). A true partridge (not wild type) is red instead of gold, I haven't figured out where to get the red enhancer yet to get that color into my breeding project.I would be an obvious liar if I said I NEVER touch my babies as the evidence is right there in my avatar. However, I do try to be brief and disturb them as little as possible to let mom and chicks bond and to keep mom from getting very upset. Never overstress a broody hen as it may interrupt the bonding process and make her a less than perfect mother or she may harm the chicks if she begins to thrash about in anger or fear.
I do make very quick health checks withing the first day or two, and I keep a close eye on them for several weeks. Pasty butt indicates they aren't drinking enough, and very occasionally you can see a health problem that needs addressing such as vitamin deficiencies (funky feet appearing within the first week) and always be on the alert of bloody diarrhea or listless and rumple appearances as coccidiosis is always a possible threat.
You are correct that Rock is the breed and buff the color...however, whenever certain colors of a breed are selectively breed for, you also usually get certain characteristics selected as well either intentionally or inadvertently. For example, in dogs, Labrador Retriever is the breed, and any litter can have yellow or black in it. However, chocolate is the recessive color and you can only get chocolate labs from a chocolate lab in the mixing, best if both parents are since it is a recessive gene, but both parents must carry the recessive gene. If you want to consistently get chocolate to sell, then you will breed only chocolate labs. Chocolate Labs, while still a lovable lab, are generally more excitable and temperamental than the more frequently naturally occurring yellow and black, they also tend to have more health issues since, if I remember right, it is a double recessive (???).
I am early in my understanding of chicken genetics, and I've learned chicken genetics works differently than mammal genetics (one item being that the female determines the gender, not the male) and I think I've picked up that you don't have to worry about over inbreeding in chickens as much as you do in mammals as adding in too many lines causes more problems than it solves.
As to the reason of my buff question, I do know that barred is dominant and partridge is the wild type, so I suspicion buff is a recessive gene that was specifically selected for to get a flock of that color to sell, hence my query as to their temperament type and quality in case some behaviors or issues crept in as well. Hopefully those that know will enlighten me.
Lady of McCamley
You are correct that barring is dominant...it only requires one copy of the gene to get barred birds. The nice thing is, if you are trying to eliminate barring you can easily choose the birds that carry the barring gene because they will all show barring if they have a copy of the gene. Other traits, such as vulture hocks, are recessive and require two copies of the gene to show. So, you can have a male that is carrying the gene and a female that is carrying the gene, breed them and end up with vulture hocks in 25% of the chicks even though neither parent shows vulture hocks and 50% of the chicks will carry the gene but not show vulture hocks, 25% would be vulture hock free. Another thing to keep in mind is that most of the time (there are some exceptions) the color of the pullets will originate with the male and the color of the males will be a split between the male and female. That's assuming that the genetics of the colors of the parent birds are pretty pure.
Anyway, all boring stuff to most people I'm sure.
