Changes made by 77/331/EEC: Commission Decision of 22 April 1977 authorizing Denmark and the Netherlands to apply special health guarantees for the prevention of leukosis in the case of bovine animals imported for breeding or production (Only the Dutch and Danish texts are authentic)
EU Decision 1977/331
No changes made by 77/331/EEC: Commission Decision of 22 April 1977 authorizing Denmark and the Netherlands to apply special health guarantees for the prevention of leukosis in the case of bovine animals imported for breeding or production (Only the Dutch and Danish texts are authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.