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Energy Losses from Potato Processing Waste during Laboratory Storage¹

University of Idaho^,3, Moscow 83843

Abstract

Two experiments were conducted to determine the amount of starch loss during laboratory storage of potato processing waste. Two types of potato waste, dry peel and filter cake, were collected from each of three potato processing plants with 10 replications per plant per type of waste. Samples of mixtures of dry peel and filter cake were also collected from the storage pits of six cattle feedlots with six replications per feedlot. Dry peel was stable during the 5-week storage period. In contrast, starch losses from filter cake ranged from 63 to 69% of the initial starch content during 5 weeks of laboratory storage. There were no differences (P>.05) among potato processing plants in either starch content or rate of starch loss from potato waste. Starch content of potato waste samples from feedlot storage pits were different (P<.05) depending on the length of time the potato waste was stored prior to feeding. Starch losses during laboratory storage of samples from feedlot pits ranged from 40.6 to 71.1% at the time of sampling. Most of the starch breakdown and loss from potato waste of neutral or low pH appears to be due to microbial action.

¹ Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 78411.

² Present address: Kellogg Mills, Nampa, ID.

³ Department of Animal Sciences.