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The effect of processings on digestive tract degradation of corn and barley grains in dairy cow: II. Ruminal and intestinal degradation of physically processed corn and barley grains by mobile nylon bag technique



The effect of processings on digestive tract degradation of corn and barley grains in dairy cow: II. Ruminal and intestinal degradation of physically processed corn and barley grains by mobile nylon bag technique



Korean Journal of Animal Nutrition and Feedstuffs 18(2): 114-121



In order to investigate the effect of four physical processings(whole, cracking, steam-flaking, grinding) of two cereal grains(corn, barley) on ruminal and intestinal degradabilities and lower tract availabilities of nutrients undegraded in the rumen, mobile nylon bag technique was introduced to four ruminally and duodenally cannulated Holstein cows fed 50:50 concentrate and grass hay. Mobile nylon bags with 45-mu-m pore size averaged 3.5 times 5.5 cm externally, and were closed off permanently by the heat sealing machine after placing 1 g sample into each bag. Ruminal and total tract degradabilities of nutrients were highest for ground barley. Intestinal degradabilities and lower tract availabilities of nutrients undegraded in the rumen were highest in ground corn for dry matter and energy and were highest in steam-flaked barley for crude protein and organic matter. Corn had the highest (P lt .05) ruminal, intestinal and total digestive tract degradabilities and lower tract availability of nutrient undegraded in the rumen by grinding. But there were no significant(P gt .05) differences among treatments of cracking, flaking and grinding for corn in intestinal degradabilities of dry matter and organic matter. For barley, ruminal and total digestive tract degradabilities of nutrients were highest for grinding, and intestinal degradabilities of nutrients were highest in flaked barley. Intestinal energy degradability and lower tract availability of ruminal undegraded energy were highest for cracking. And of total tract disappeared energy almost all the barley energy disappeared at the rumen. Nutrients of barley were degraded more extensively than those of corn in the rumen and total digestive tracts, but intestinal degradabilities were higher for corn than for barley.

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