Waste poultry intestines (PI) consist of 75.8% water, 7.9% ether extract, 12.4% protein and 1.7% ash. The process of ensiling PI after mixing with different levels of molasses (5-12% w/w) and common salt (0.5-2.0% w/w) was studied under microaerophilic conditions at Indian ambient temperature (26 +/- 2 degrees C). The inhibitive effects of benzoic, propionic and sorbic acids on growth of yeasts and moulds during fermentation was also studied. The results showed that molasses at less than 10% was inadequate and at 12% had no additional advantage for effecting fermentation. Salt at 0.5-2.0% (w/w) had no marked effect on pH and the microbial profile. Propionic acid at 0.5% (v/w) was quite effective in controlling the growth of yeasts and moulds. A microbiologically safe silage product can be prepared by homogenising PI with 10% (w/w) molasses and 0.5% (v/w) propionic acid and fermenting under microaerophilic conditions at ambient temperature (26 +/- 2 degrees C) for 6 days.