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Effect of feeding levels of starch on cell wall digestibility of various feeds in the rumen


, : Effect of feeding levels of starch on cell wall digestibility of various feeds in the rumen. Grassland Science 36(4): 452-457

The effect of gradual increase in level of starch in diet from 0 to 32% on in situ cell wall (CW) digestibility of various feeds was examined by nylon bag method with 24 hr incubation in the rumen of a Japanese black steer equipped with rumen fistulae. Cell wall fraction isolated from eight kinds of hay with different species and cutting times, corn and sorghum silages, rice straw, and five kinds of by-products were used for the in situ digestion trial. The ruminal characteristics of the steer were of high acetate (above 60 molar %) fermentation pattern without remarkable fall of pH (5.85 at 2.5 hr after feeding) even when the diet with 32% of starch was fed. Little effect of starch was seen on CW digestibilities of forages with high CW digestibility more than 50% on 0% starch level (early-cut Italian ryegrass, early-cut orchardgrass) and those with remarkably low CW digestibility less than 40% (reed canarygrass, rice straw), while forages with the medium CW digestibilities between them showed decrease of CW digestibility by increase of starch level (late-cut Italian ryegrass, late-cut orchardgrass, Sudangrass). Corn silage and sorghum silage also decreased their CW digestibilities by increase of starch level. For by-product, however, the increase of starch level did not affect on CW digestibilities of sugar-beet pulp, wheat bran and brewer's grain, and those of corn gluten feed bean curd refuse rather increased by increase of starch level which suggesting the digestibility of hemicellulose fractin in these feed may increase by supply of starch.

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