The experiment was carried out to study the effects of roughage types on feed intake andnutrient digestibilities in swamp buffaloes (Bubalus bubalis). Three rumen-fistulated buffaloes,about 5 years of age with average liveweight of 500+56 kg, were allotted to receive one of the threeroughage sources according to a 3x3 Latin square design with extra period. The dietary treatmentswere as follows: rice straw (RS), urea-treated rice straw (UTS) and cassava hay (CH). Buffaloeswere offered roughage ad libitum and accessed to clean water freely. Four experimental periodswere employed and each period lasted for 21 days. In each period, the animals were adjusted for 14days to feed and voluntary intake was measured then followed by total collection method during thelast 7 days. The results showed that voluntary roughage intake of buffalo fed UTS (2.05 %BW) wasslightly higher (P>0.05) than those in buffalo fed CH and RS (1.94 and 1.68 %BW). Apparentdigestibilities of dry matter, organic matter and neutral-detergent fiber in buffalo fed UTS (64.6,69.8, and 70.1 %) were significantly higher (P<0.05) than those buffaloes fed CH (60.9, 62.6, and59.7 %) and fed RS (51.1, 65.4, and 55.6 %). Acid-detergent fiber digestibility was not different(P>0.05) among treatments. Crude protein digestibility of buffalo fed CH (74.0 %) wassignificantly higher (P<0.05) than those buffalo fed UTS (44.1 %) or RS (28.1 %). However,การศึกษาการตรวจสอบระดับอาหารที่เหมาะสมของอาหารในแง่ของประสิทธิภาพของอาหารจุลินทรีย์หมักและอาหาร และโดยเฉพาะอย่างยิ่งในหนองควายควรดำเนินการ สามต่อ fistulated
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