Abstract
AbstractType A starches (Manihot utilissima, Dioscorea dumetorum and Colocasia antiquorum) and type B starches (Canna edulis, Dioscorea alata and Dioscorea cayenensis) are investigated. Results show that the degradation of the pure tuber starch as compared with that of feeds made from a particular starch is more or less the same. However, type A starches are more rapidly degraded by bacterial α‐amylase. The susceptibility to attack is compared to the nutritional efficiency of the feeds using axenic and holoxenic chickens. Comparison of the degree of degradation of the starch granules in the crop as well as in the feces (by in vitro and in vivo studies) is made by scanning electron microscopy. Type A starches show always a higher susceptibility to α‐amylase attack. The feed efficiency tested on chicken and digestibility of tuber starches in the sheep rumen and in the chicken crop increase as their ease of degradation by bacterial α‐amylase (in vitro) increases.
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