Birds mature very slowly, sometimes taking at least three years to put on all their weight. With each strain, different health problems may develop. Proper diets are very important for good growth, and fertility.
When raising chicks, keep in mind that they grow slowly. To much protein in their diet, can cause them to go down on their hunches. Keep birds in the brooder for at least eight weeks (or until they are fully feathered). You may also want to brood naturally hatched chicks, as mothers are not usually very good at rearing their young. Keeping perches out of the young chicks brooders will help prevent leg and breast bone damage.
Saipan Jungle fowl are not winter hardy, and shouldn't be expected to live in cold temperatures without providing heat.