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Kappeli, S.; Frohlich, E.; Gebhardt-Henrich, S.G.; Pfulg, A.; Schaublin, H.; Zweifel, R.; Wiedmer, H.; Stoffel, Michael Hubert (2011). Effects of dietary supplementation with synthetic vitamin D-3 and 25-hydroxycholecalciferol on blood calcium and phosphate levels and performance in laying hens. Archiv für Geflügelkunde, 75(3), pp. 179-184. Stuttgart: Ulmer
