About chickens not digesting the lactose in the milk was told to me by a compatriote and biologiste of yours from Sinnai.
I use for years the acidity of yoghurt and I never had problems with coccidiose. This tip was told to me by an old breeder. I like to share the good and simple things that really help us little breeders.
Thanks Alessio for doing the effort to write in English and even more thanks for accepting me in your community. Grazie.