The Particle Size Distributions of Ingested Boli, Rumen Digesta and Feces in Sheep Fed Orchardgrass Hay Harvested at Different Stages of Maturity

DOI Web Site 1 Citations

Bibliographic Information

Other Title
  • 刈取り期の異なるオーチャードグラス乾草を1日1回給与しためん羊における嚥下食塊,反芻胃内容物および糞の粒度分布
  • カリトリキ ノ コトナル オーチャードグラス カンソウ オ 1ニチ 1カイ キ

Search this article

Abstract

The changes in particle size distribution of ingested boli, rumen digesta and feces were investigated with four rumen cannulated sheep receiving 3 varieties of orchardgrass hay (H1, H2 and H3) once a day. The hay was harvested at three stages of maturity: pre-heading; a 1:1 heading to blooming ratio; and a 1:1 blooming to fruiting ratio for H1, H2, and H3, respectively. The digestion coefficients and voluntary intake for hay decreased with advancing stage of maturity. The sheep were fed 1300g of the unchopped hay for 3h a day and represent-ative samples of total rumen digesta were collected at 3, 7, 11, 15, 19 and 24h after feeding. The particle size distribution of every sample was determined by the wet-sieving technique and expressed as the dry matter proportion of large particles (LP, retained on 5600, 2360 and 1180μm sieves), small particles (SP, passed through a 1180μm sieve and retained on 47μm sieves) and soluble fraction (SOL, passed through a 47μm sieve) to total sample dry matter. The percentage of LP in the ingested boli was higher for H1 than for H2 or H3. The percentage of the boli-particles retained on a 5600μm sieve was prominently higher for H1, as compared to that for the other hay varieties. The percentage of LP in the rumen digesta decreased from 46% at 3h after feeding to 13% at 24h for H1, 39 to 14% for H2 and 34 to 8% for H3, respectively. However, the percentage of ruminal LP at each sampling time tended to be higher for H1 than for H2 and H3, although the difference was not so marked. The percentage of SP increased from 28% at 3h after feeding to 47% at 24h for H1, 35 to 62% for H2 and 47 to 68% for H3, respectively. The percentage of ruminal SP was higher (P<0.05) for H2 and H3 than for H1 at every sampling time. The percentage of SOL in the rumen digesta tended to increase with time after feeding (from 26% at 3h to 41% at 24h) for H1, whereas it showed no change with time and accounted for about 25% of total digesta for H2 and H3. The percentages of LP in feces were very low for the three hay varieties. The percentage of SP in feces for H3 was higher (P<0.05) than for either H1 or H2, and inversely. SOL was lower (P<0.05) for H3 than for the other hay varieties.

Journal

Citations (1)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top