Effect of virginiamycin on performance and rumen parameters of young calves

acetate acetates acide gras volatil acide lactique aliment d'allaitement ammonia ammoniac application rates butiratos butyrate butyrates calves digestive juices dose d'application gain de poids ganancia de peso jugos digestivos lactic acid milk replacers ph propionate propionates propionatos rumen suc digestif ternero veau virginiamicina virginiamycin virginiamycine volatile fatty acids weight gain