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- W2197761090 abstract "Sheep and cattle may spend up to 12 h/d ruminating, however, there is little quantitative information available on processes of bolus formation and particle breakdown that take place during rumination and how these may be influenced by diet. In this study 6 2-year-old Romney wether sheep were trained to allow boli to be collected via an oesophageal tistula while the sheep ruminated. The sheep were fed hourly (950 g dry matter (DM)/d) the following forages providing a range of digestibilities: fresh vegetative perennial ryegmss (PRl, 79%); fresh mature ryegrass (PR2, digestibility not determined); fresh red clover (RC, 79%); fresh lucerne (FL, 72%); chaffed meadow hay (MH, 60%) and chaffed luceme hay (LH, 54%). Particle size distribution in digesta was determined by wet sieving with 4, 2, 1, 0.5 and 0.25 mm sieves. Preliminary reports on cell wall chemical composition and digestibility (John and Waghom, 1986) and particle breakdown during eating (John and Reid, 1986) have been given. During each rumination cycle the regurgitated (Up) bolus .on arrival at the mouth is separated into a fraction (Tail) which is immediately reswallowed and a fraction (Retained) which is retained in the mouth, chewed on and then reswallowed (Down). There were some large differences between diets in the weights of Up and Tail boli (Table 1). Although a smaller variation occurred with the weights of Retained digesta, differences in DM content of digesta resulted in a nearly 2-fold range in Retained DM. Down boli were larger than Retained digesta for each of the forages with the difference being due to addition of saliva during rumination (5.3, 4.5, 6.3, 4.0.4.9 and 8.7 f. 0.72 g/bolus respectively). When compared to concentrations of DM and large particles (LP; particles too large to pass a 1 mm sieve) in rumen digesta, the digesta in Up boli had a lower DM content and a lower LP content. These differences probably reflect the composition of digesta in the anterior rumen from which the Up bolus is selected. Digesta selected in the mouth for" @default.
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- W2197761090 date "1988-01-01" @default.
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- W2197761090 title "Physical breakdown of forages during rumination" @default.
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