A study was conducted on the relation between ingestive behaviour of grazing goats and tropical grasses. Three goats fitted with oesophageal fistulae were used for measuring dry matter intake per bite (DMI/TB) from Dallis grass (Paspalum dilatatum) and Bermuda grass (Cynodon dactylon) pastures at 59 and 80 days of regrowth. Whole plants, harvested parts of plants by goats, un harvested parts of the plants from each pasture were collected for chemical analyses and determination of in vitro dry matter digestibility (IVDMD) and energy. Digestible dry matter intake per bite (DDMI/TB) and digestible energy intake per bite (DEI/TB) were estimated. The results obtained were as follows: Harvested parts by goats showed higher crude protein, IVDMD and digestible energy, however lower cell wall constituents than those of unharvested parts at two growth stages in both species. Goats had larger DMI/TB at 80 days of regrowth comparing with 59 days, however DDMI/TB and DEI/TB showed little differences between two stages in both grasses. There was no differences between grasses in DMI/TB, DDMI/TB and DEI/TB at both stages.
暖地型イネ科牧草草種(ダリスグラス及びバミューダグラス)と山羊の採食行動との関連について,食道フィステル装着山羊3頭を供試し,採食部と残食部の化学成分,in vitro乾物消化率及び可消化エネルギー並びにひと噛み当たりの乾物摂取量,可消化乾物摂取量及び可消化エネルギー摂取量を指標として検討した.得られた結果は次のとおりである.供試ダリスグラス及びバミューダグラスの採食部の粗蛋白質含量, in vitro乾物消化率及び可消化エネルギーは残食部のそれらと比べ高い値を示し,採食部の細胞壁構成成分含量は残食部のそれと比べ概して低い値を示した.また,ダリスグラス及びバミューダグラス草地における山羊のひと噛み当たりの乾物摂取量は再生59日目よりも80日目で高い値を示したが,いずれの時期においても両草種間でほとんど差は認められなかった.さらに,ひと噛み当たりの可消化乾物摂取量及び可消化エネルギー摂取量は両生育段階及び草種間で大きな差は認められなかった.
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