A critical view on the conversion factor 6.25 from total nitrogen to protein [incl. grass meal, skim milk powder, amide-N]

bone meal contenido proteico dried skim milk farine d'os farine de poisson farine de viande feed legumes feed meals fish meal grain feed granos pienso harina de carne harina de huesos harina de pescado harina para piensos leche descremada en polvo leguminosas forrajeras meat meal nitrogen pisum sativum protein content soybean meal tourteau de soja