Evaluation of preprandial and postprandial serum bile acids and plasma ammonia concentrations in healthy dogs, and the effects of frozen storage on plasma ammonia concentrations - Kogika, Márcia Mery; Matsuura, Shinobu; Hagiwara, Mitika Kuribayashi; Mirandola, Regina Mieko Sakata; Ortolani, Enrico Lippi (Brazilian Journal of Veterinary Research and Animal Science, 1999)