title: Ruminal and salivary concentration of some sulphonamides in cows and their effect on rumen flora.
abstract: Sulphadiazine, sulphatiazole and sulphamerazine were shown to be excreted through the ruminal wall and salivary glands of cows. These sulphonamides had a slight inhibitory effect on cellulose digestion and on the activity of rumen infusoria. Acetylation of the sulphonamides occurred to a slight extent. Sulphatiazole was more acetylated (16.2 per cent) than sulphadiazine (7.0 per cent) or sulphamerazine (8.4 per cent). The rate of elimination of the three compounds, as indicated by their half lives, showed that sulphathiazole was the most rapidly excreted (2 h), whereas sulphadiazine and sulphamerazine were more slowly excreted, 5.4 and 7.1 h respectively.
mesh_terms: D000818:Animals; D002417:Cattle / Q000378:metabolism*; D005260:Female; D012417:Rumen / Q000378:metabolism / Q000382:microbiology*; D012463:Saliva / Q000378:metabolism*; D013411:Sulfadiazine / Q000378:metabolism / Q000494:pharmacology; D013416:Sulfamerazine / Q000378:metabolism / Q000494:pharmacology; D013432:Sulfathiazoles / Q000378:metabolism / Q000494:pharmacology; D013449:Sulfonamides / Q000378:metabolism*
chemical_list: D013432:Sulfathiazoles; D013449:Sulfonamides; D013411:Sulfadiazine; D013416:Sulfamerazine