Odors associated with animal production are a problem of increasing significance. Conflicts resulting from livestock and poultry odors emphasize the need for a better understanding of odor production and control. Four reactor units that stored dairy manure were used in this study. Supernatant was drawn from the manure. Total volatile organic acids were determined by a variation of the dilution method. An odor panel was established and an odor intensity index was established using the triangle test. The odor panel surveyed the flasks and filled out an answer sheet. Of the three odorants involved, the odor intensity index correlated best with volatile organic acid concentration, next best with hydrogen sulphide and poorest with ammonia.