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El-Katcha, M., Soltan, M., El-Naggar, K., El-Shobokshy, S. and El-Erian, M. 2019. LAYING PERFORMANCE, FAT DIGESTIBILITY AND LIVER CONDITION OF LAYING HENS SUPPLEMENTED WITH VITAMIN B12 OR BIOTIN AND/ OR BILE ACIDS IN DIET. Slovenian Veterinary Research. 56, 22-Suppl (Mar. 2019). DOI:https://doi.org/10.26873/SVR-773-2019.