IF I had a large number of chicks or brooding from an incubator (neither of which is applicable in my situation) I would certainly use it IF it were available here (which it isn't >I live in Holland and medication in the chick starter is not allowed here )
Coccidia resistance cannot be transferred from the "resistant" parents genetically ... however the
presence of the hen (hen caring for chickies as oposed to a brooder situation) i.e. the chicks being exposed to the cocci is important to build up resistance (you have to have exposure in order to build resistance) but only if the chicks are not overwhelmed by the oocysts (cocci) in such a great number that their system becomes overwhelmed (then you have clinical disease).
If you have a "natural" hatch (i.e. mamma taking care of chickies) then it is useful to separate the hen and chickies from the main pen (thus avoiding an area with a larger amount of poo > i.e. cooci oocysts).... cocci thrive in wet damp cool conditions so keep the nest off the ground and keep the area DRY.
If you are hatching from an incubator and keeping the chickies in a brooder inside then this is a more risk filled situation for the chickies as far as cocci is concerned as they have not been exposed to it (through mamma hen) being in a brooder all that time... in this situation , you will want to expose them gradually and you can do this by putting a bit of the dirt from the run in their brooder .(AFTER 4 weeks of age not before) underneath the shavings and only letting them out for limited amount of time and then back to the brooder environment (in this way slowly exposing them to the natural conditions of the outside environment gradually instead of all at one time.)
I have a system which works well for me (my very first birds had cocci so I know it is in my yard) ....
I have this little cat whicker basket (see photo) that my birds brood and hatch in... when they start hatching I put that (with mamma and all) inside this huge rabbit cage... this way they are off the ground and mamma can come and go through the door but the chickie can not...when they are a bit bigger I slowly make mamma stay out of the cage for longer periods ... all conditional of course on the weather and age of the chickies as she is the one providing them warmth and I do not let them on the ground till 4 weeks old. I have never lost a chick or had to treat for cocci using this system but it is hardly suitable for larger numbers of chicks.
Here is a photo of my system: