I was given 2 adult black sex hens, and a roo. All about 6-8 years old according to the farmer. I carefully watched them in with my 16 silkies that are only 7 weeks old all day, they are doing fine. (so far). I forgot all about food being different for adult chickens, will it hurt them to eat the medicated starter until I can get to the supplier for regular feed? Which will probably by Friday????