Journal Article Research Support, Non-U.S. Gov't 27YLU75U4W Ammonia-producing Bacteria DAB gene Dairy Cow Fermentation Fish Proteins Hainanmycin Ichthyophthirius multifiliis Metabolizable Protein Methionine Methylthio Butyric Acid Milk Protein N762921K75 Nitrogen Oxygen Phosphorus Protein Degradation Rumen-protected Methionine S88TT14065 Water Pollutants, Chemical gene expression grass carp major histocompability real-time quantitative PCR