Improvement of Nutritive Value of Tropical Grasses by Physical or Chemical Treatment : 3. Effect of ammonia treatment on chemical composition and dry matter digestibility

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  • 暖地型イネ科牧草の物理・化学処理による栄養価値改善 : 3.アンモニア処理が化学成分及び乾物消化率に及ぼす影響
  • ダンチガタ イネカ ボクソウ ノ ブツリ カガク ショリ ニ ヨル エイヨウ

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Abstract

To investigate the effect of ammonia treatment on the nutritive value of tropical grasses, mature guineagrass (Panicum maximum JACQ. var. maximum), green panic (Panicum maximum JACQ. var. trichoglume EYLES) and Rhodesgrass (Chloris gayana KUNTH.) were treated with anhydrous ammonia (NH_3/grass: 1.5 or 3.0% in dry weight) at 20℃ for 4 weeks, and chemical composition and in vitro dry matter (DM) digestibility of the treated samples were compared with those of the untreated samples. In vitro DM digestibility of the samples was measured by incubation with rumen fluid of goats and pepsin. The results obtained were as follows: Crude protein content increased with both treatments and showed slightly higher value with 3.0% treatment comparing with 1.5% treatment. Acetyl bromide lignin (ABL) content made little changes with 1.5% treatment, however it tended to decrease slightly with 3.0% treatment. Silica content showed a slight decrease with both treatments. In vitro DM digestibility increased greatly with both treatments and showed slightly higher value with 3.0% treatment than with 1.5% treatment. ABL digestibility increased with both treatments. The increase of DM digestibility in each treatment was correlated higher with the increase in ABL digestibility comparing with the decrease in content of ABL or silica. The recovery of DM of the sample made little changes with both treatments, therefore that of digestible DM increased and showed slightly higher value with 3.0% treatment than with 1.5% treatment. The result suggested that 3.0% treatment was more effective than 1.5% treatment for improving the nutritive value of tropical grasses by ammonia treatment.

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