8Kertz A F,Reutzel L F, Mahoney J H. Ad libitum water intakeby neonatal calves and its relationship to calf starter intake,weght gain[J]?feces score,and season. Dairy J Sci. 67:2 964-2 969.
9NAYAK S K.Probiotics and immunity:A fish perspec-tive[J].Fish and Shellfish Immunology,2010,9(1):2-14.