黒毛和種牛に対する蒸煮白樺給与時の消化管各部内容物中ミネラルの動態

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  • Movement of Minerals in the Gastrointestinal Tract of the Japanese Black Cattle fed on Steamed White Birch as Roughage
  • クロゲワシュ ウシ ニ タイスル ジョウシャ シラカバ キュウヨジ ノ ショウ

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This study aimed to determine the effect of steamed white birch feeding on movements of water, pH, Na, K, Mg, Ca and P of contents in the gastrointestinal tract. An experiment was carried out with eight 2.2-year-old Japanese Black Cattle (615-630kg B. W.), each 4 of which had been fed on concentrates (75%) and orchardgrass hay (25%) (O group) or steamed white birch (25%) (W group) as roughage during 5 months. After the experimental animals were sacrificed, the gastrointestinal tract was divided into 20 parts: reticuro-rumen (Ru-Re), omasum (Om), abomasum (Ab), 10 small intestinal segments of 50cm at intervals of 3m (S-1-S-10), cecum (Ce), 5 large intestinal segments of 50cm at equal intervals (L-1-5). A part of each digesta was analyzed for total contents (T) of minerals, and another one was separated into supernatant (S) and precipitate (Pp) by centrifugation at 1, 800×g/10min but only the S sample was analyzed. Mineral contents in Pp and mineral ratio (S%) in the supernatant were calculated by Pp=T-S and S%=(T/S)×100, respectively. Although the contents of each mineral in the steamed white birch was 2-30% in the orchardgrass hay, the total intake of each mineral in the W group was 70-90% of the O group. There no difference between the O and W groups in the serum concentrations of the minerals and in water, pH, and the minerals of the contents in the different segments of the gastrointestinal tract. In the gastrointestinal tract of both the groups, there were significantly negative correlations between pH and Mg in the S% (P<0.05 and 0.01) and between Mg in the Pp and P in the S% (P<0.05 and 0.001). However, there were significantly positive correlations between water and Na (both, P<0.001), between Na and K (P<0.05 and 0.01) or P (both, P<0.001) in the S, between K and P in the S (both, P<0.001). between K and Mg in the S% (P<0.05 and 0, 01) and between Ca and P in the S% (both, P<0.01). In the small intestine of both there were significantly positive correlations between pH and water (both, P<0.05) or Ca in the T (P<0.01 and 0.05), between water and Mg (both, P<0.01) or Ca (both, P<0.01) in the Pp and bet-ween Mg and Ca in the Pp (P<0.001 and 0.01). Also, in the large intestine, there were significantly positive correlations between pH and Na in the T (both, P<0.05) and between Ca and P in the Pp (both, P<0.05).

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