SITE AND EXTENT OF MAIZE STARCH DIGESTION IN LACTATING COWS FED WITH GROUND MAIZE OR EAR-MAIZE SILAGE
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Abstract
The site and extent of maize starch digestion conducted was conducted in a 2x2 cross-over experimental design with 4 lactating cows fitted with a fistula at the rumen, proximal duodenum and terminal ileum. The cows were fed either with ground maize at fully dent stage or ear-maize silage produced from ear with husks at dough stage. Starch content in ground maize and ear-maize silage were 63.3 and 47.7 per cent (based on dry matter) respectively. Hay, soyabean meal and minerals/vitamins mixture were also fed to the animals. Cr-EDTA was used for estimating rumen, small and large intestine digestibility; starch analysed by an enzymic method.
The lower average rumen starch digestibility was found in ground maize diet (52 per cent) compared with ear-maize silage diet (83 per cent). Considerable amount of starch (1.9 kg/cow/day escaped rumen fermentation and entered the small intestine in the ground maize diet. The digestibility of this starch (52 per cent) in the small intestine was lower than that (68 per cent) ot the ear-maize silage diet, but the amount of the digested starch from the ground maize was higher in this segment (1.0 vs. 0.3 kg/day/cow respectively). The proportion of starch digested in the hindgut was higher in ground maize diet (15 per cent) than that (13 per cent) of ear-maize silage diet. The total tract starch digestibility was 92 per cent for ground maize diet and 98 per cent for ear-maize silage diet.
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