Ca RETENTION IN YOUNG PULLETS AND LAYING HENS FED A Ca47 LABELLED DIET OF DIFFERENT Ca LEVELS K. BRONSCH, K. LÖRCHER and J. VILLWOCK Ann. Biol. anim. Bioch. Biophys., 10 Hors-série 2 (1970) 59-67 DOI: 10.1051/rnd:19700605