I have a couple of wild caught female balls that i got as adults a couple of years ago, that I feed gerbils to, but I had already been breeding gerbils for several years before this, personally my gerbils breed very well, and if given proper attention and if all there requirements are met they are very productive. But you cant keep gerbils in a large comunal breeding group like you do mice or rats.
Gerbils are social animals and cannot be kept alone, but for breeding purposes they cant be kept in large groups either, idealy 1.1 is all you need to an enclosure. Although I do have a couple housed at a 1.2 ratio. But anything over that is no good.
If you are introducing new animals to each other, it is best to do so in a split cage until they are used to each others sent (usually a week sometimes two) switch them from side to side a couple of times a day for a week then take the divider out, if they fight put the divider back in for a couple of more days and try again, do not leave them together without the divider until they cuddle up together to sleep.
I feed my gerbils LM's Vita-vitals Gold (less sunflower seed than most commercial gerbil foods and I still take out some of the sunflower seeds. Leave a small bowl of this in cage at all times, and I give a small portion of salad mix at night(no more than can be eaten in a few hours).
I also give my gerbils a nest box, and a couple of toys for climbing and exploring on and in. (I do not do this for my breeder mice and rats).
And gerbils usually like a little warmer temp than mice and rats I keep my gerbils around 83-85 F.
My breeding cages have the following.
Cage #1 - 1.2 gerbils
Cage #2 - 1.1 gerbils
Cage #3 - 1.2 gerbils
Cage #4 - 1.1 gerbils
Cage #5 - 1.1 gerbils
groups are left together at all times, never seperate the males as they help take care of the kittens and females sometimes get stressed with no male to help (also if you remove the male they will have to be reintroduced using the split cage method).And never introduce new animals to a group, because they will fight to death. and dont wory about keeping the males with the females although they may mate following birthing, the female will keep herself from becoming pregnate until she has weaned her babies.
Gerbils do tend to have to be older than mice to breed though usually 8 - 10 weeks alhough if the female does not feel ready she will not breed.
With the setup above I usually have 6-10 kittens born every month which is more than enough to feed 2 stuborn snakes.
As far as fat and protein levels of gerbils vs. mice its not that much difference, and besides gerbils are what ball pythons eat in the wild so........there natural choice of food can't be too bad for them.
But I caution everyone who reads this not to feed gerbils unless you have to, because balls do prefer this food and if they get it even once it will be hard to swith them back to mice/rats.
well I guess thats about it just my two sents worth.
snakedoc1