In vitro ruminal degradability of cereal grain starch
Tomankova, O.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))E-mail:tomankova.olga@vuzv.cz | Homolka, P.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))
An in vitro method was used to determine ruminal degradability of starch in a set of cereal grains. The set included 9 feed samples as follows: 2 samples of ground wheat, 2 samples of wheat treated with sodium hydroxide, ground barley, barley treated with sodium hydroxide, 2 samples of ground oats and ground maize. Ruminal degradability of starch was assayed by fermentation for 2, 4, 6, 16, and 24 hours. A significant difference in starch degradability was found between treated and untreated ground samples after 2-hour fermentation (13.73+/-3.12 vs. 32.77+/-8.17; P less than 0.001), 4-hour fermentation (33.44+/-7.31 vs. 60.30+/-16.71; P less than 0.001) and 6-hour fermentation (42.63+/-7.13 vs. 74.20+/-6.38; P less than 0.001). On the basis of the rate of starch degradability the order of cereal grains was as follows (from the highest to the lowest value): ground oats, ground wheat, ground barley, ground maize, wheat, and barley treated with sodium hydroxide.
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