Meine Oma hat immer Eierschalen- oder Muchelkalk verfüttert (allerdings bekamen auch die Hühner Muschelkalk zur Härtung der Eierschalen).

__________________
My line of thoughts about dogs is analogous. A dog reflects the family life. Whoever saw a frisky dog in a gloomy family, or a sad dog in a happy one? Snarling people have snarling dogs, dangerous people have dangerous ones. And their passing moods may reflect the passing moods of others.~ Sherlock Holmes in "The Creeping Man" (Deutscher Titel: "Der Mann mit dem geduckten Gang) von Sir Arthur Conan Doyle