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Unique Aspects of Digestion and Passage of Grazing Native Grass in the Rumen and Lower Tract

Accession number;05A1044277

Title;Unique Aspects of Digestion and Passage of Grazing Native Grass in the Rumen and Lower Tract

Author; YAYOTA MASATO (Gifudai Oyoseibutsukagaku) KARASHIMA JUN (Gifu Univ., Graduate School of Agriculture, JPN) KOKETSU TSUKASA (Gifu Univ., Graduate School of Agriculture, JPN) NAKANO MIWA (Gifu Univ., Graduate School of Agriculture, JPN) OTANI SHIGERU (Gifudai Oyoseibutsukagaku)

Journal Title;Shokuniku ni kansuru Josei Kenkyu Chosa Seika Hokokusho

Journal Code:X0296A

ISSN:

VOL.23;NO.;PAGE.132-137(2005)

Figure&Table&Reference;TBL.3, REF.9

Pub. Country;Japan

Language;Japanese

Abstract;Native forages in rangeland, woodland and abandoned arable land should be used as a resource of beef cow-calf operation. The objective of this study was to clarify digestive characteristics of native forage in rumen and lower tracts, compared with improved grass. The study was conducted in two seasons, spring and autumn. Nezasa dwarf bamboo (Pleioblastus chino makino) as native forage and Bahiagrass (Paspalum notatum Flluege) as improved forage were used. Suffolk ewes surgically fitted with ruminal or duodenum cannulae were used in this study. In exp. 1, whole tract digestibility, ruminal disappearance and passage rate of rumen and lower tract were determined. In exp. 2, extent of lower tract disappearance was determined by the mobile bag method. Whole tract digestibility of dry matter (DM) and neutral detergent fiber (NDF) in Nezasa bamboo were lower than those in bahiagrass. There was no difference in crude protein (CP) digestibility between forages. In extent of ruminal disappearance at 120hr, DM, CP and NDF disappearance in Nezasa bamboo were lower than those in bahiagrass. No difference was determined in passage rate in the rumen and the lower tract between forages. In lower tract, DM disappearance of Nezasa bamboo was lower than that in bahiagrass. CP disappearance of Nezasa bamboo in the lower tract, however, did not differ from that in bahiagrass. Additionally, in rumen + pepsin incubation, CP disappearance of Nezasa bamboo in autumn was highest among the forages. These results indicated that, in terms of DM, digestion of Nezasa bamboo was difficult both in rumen and lower tract, compared with bahiagrass. Whereas, ruminal digestion of CP in Nezasa bamboo was supported by lower tract digestion, and whole tract digestibility of CP was reached as the same level of bahiagrass. (author abst.)

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