Commission Regulation (EEC) No 3387/82 of 16 December 1982 amending Regulation (EEC) No 368/77 on the sale by tender of skimmed-milk powder for use in feed for pigs and poultry and Regulation (EEC) No 1725/79 on the rules for granting aid to skimmed milk processed into compound feedingstuffs and skimmed-milk powder intended in particular for feed for calves