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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1995;8(3): 267-273.
https://doi.org/10.5713/ajas.1995.267    Published online June 1, 1995.
Effect of orchardgrass growth stage on pool size and kinetics of digesta particles in the rumen of sheep
T. Ichinohe, T. Tamura, K. Ueda, M. Okubo, Y. Asahida
The differences in rumen particle pool size, passage rate and rumen degradability in sheep receiving three varieties of orchardgrass hay harvested at pre-heading (HI), early-bloom(H2) and late-bloom(H3) were investigated using four ruminal-cannulated wethers(68kg) fed 1,300 g of the hay once a day. Representative samples of whole rumen contents were collected at different times after feeding and the quantities of rumen particle pools [large particle pool(LPP), retained on a 1,180 關m sieve; small particle pool(SPP), retained on a 47 but passed a 1,180 關m sieve; and soluble fraction(SOL), passed a 47 關m sieve(SOL)] were determined by a wet-sieving technique. The following results were obtained: 1) The dry weight of whole rumen contents were significantly lower(p<0.05) for H1 than for H2 or H3. The reduction rate of whole rumen contents was slightly but significantly greater for H1 than the other hay varieties. 2) The LPP disappearance rates were 26.2, 25.3 and 21.7 g DM/h for H1, H2 and H3, respectively, and no statistical differences were found among the hay varieties. Appreciable changes were not observed with SPP and SOL throughout measurements for all hay varieties; however the SPP was markedly greater(p<0.05) for H2 and H3 than for H1, while SOL did not differ among hay varieties. 3) The SPP passage rate(g DM/h) and effective rumen degradability(%) for H1, H2 and H3 were, respectively, 9.7, 56.6; 16.9, 42.3; and 18.0, 28.9/ The ruminal turn-over rate for SPP appeared to be higher for H1 than for the other hay varieties.
Keywords: Rumen Particles; Particulate Kinetics; Orchardgrass Hay; Growth Stage; Sheep

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