The Employment Court has ordered Affco Wairoa to re-instate 160 union members, locked out for six months, to return to work with their normal shifts and recognition of seniority.
The dispute started when the NZ Meat Workers Union and Affco failed to renegotiate a collective agreement that expired in 2013.
The union sought a nil wage increase and for the agreement to roll over.
Company changes included removal of a seniority clause, which gave workers with the greatest experience first refusal of jobs at the start of a new season.
The company walked away from negotiations citing recent amendments to the Employment Relations Act.