Title 21: Food and Drugs
PART 573—FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALS
Subpart B—Food Additive Listing
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§ 573.600 Lignin sulfonates.
Lignin sulfonates may be safely used in animal feeds in accordance with the following prescribed conditions:
(a) For the purpose of this section, the food additive is either one, or a combination of, the ammonium, calcium, magnesium, or sodium salts of the extract of spent sulfite liquor derived from the sulfite digestion of wood or of abaca ( Musa textilis ) or of sisal ( Agave sisalana ) in either a liquid form (moisture not to exceed 50 percent by weight) or dry form (moisture not to exceed 6 percent by weight).
(b) It is used or intended for use in an amount calculated on a dry weight basis, as follows:
(1) As a pelleting aid in the liquid or dry form in an amount not to exceed 4 percent of the finished pellets.
(2) As a binding aid in the liquid form in the flaking of feed grains in an amount not to exceed 4 percent of the flaked grain.
(3) As a surfactant in molasses used in feeds, as liquid lignin sulfonate, in an amount not to exceed 11 percent of the molasses.
(4) As a source of metabolizable energy, in the liquid or dry form, in an amount not to exceed 4 percent of the finished feed.
