Which is the largest chamber of the ruminant stomach? What is its role? Share with your friends Share 3 Mary Ann Alexander answered this The rumen is the largest chamber of the ruminant stomach.. Hope it helps you..!! :) 3 View Full Answer Anupam Shandilya answered this rumen and it is to store the grass -2 Hiteshi Gupta answered this its rumen here the food is partially digest & called cud -1