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Studies on In situ and In vitro Degadabilities, Microbial Growth and Gas Production of Rice, Barley and Corn

쌀, 보리, 옥수수의 반추위내 In situ 및 In vitro 분해율, 미생물 성장과 Gas 발생량에 대한 연구

  • 이상민 (경상대학교) ;
  • 강태원 (경상대학교) ;
  • 이신자 (경상대학교) ;
  • 옥지운 (경상대학교) ;
  • 문여황 (진주산업대학교) ;
  • 이성실 (경상대학교)
  • Published : 2006.10.31

Abstract

Ground rice, barley and corn were fed separately to the ruminally cannulated Hanwoo (Korean native cattle) for comparing their in situ and in vitro degradabilities, microbial growth, pH and gas production. It has been found that nearly all the dry matter (DM) and organic matter (OM) in barley and rice disappeared during 24 hr suspension in the rumen, but those in corn were only reduced by around 67%. Water soluble DM and OM fractions(‘a’), ranked from highest to lowest was corn, then rice and finally barley, but the order was reversed for content ‘b’, degradable fraction during time ‘t’. Judging by the degradation parameter of ‘b’ fraction, degradation rates per hour of DM and OM for barley were 38.3% and 37.2% respectively, significantly higher than those for rice (7.7% and 5.6%) and corn (4.1% and 1.3%). In general, results obtained from in vitro degradability of DM and OM were lower than those from in situ trials, but the ranking order of degradability was in agreement between both trials. In particular, ground rice has relatively lower in vitro microbial growth than corn or barley, but exhibited higher gas production. In addition, in vitro microbial growth of ground rice increased with up to 12 hr of incubation period, thereafter experienced a decrease with extended incubation time. pH of in vitro solution of rice decreased following 9 hr of incubation but gas production increased rapidly during the same period. From the results of DM and OM degradabilities and pH changes of in vitro solution with incubation time, it is concluded that rice represents a good source of energy for stability of rumen fermentation.

Keywords

Rice;Barley;Corn;Ruminal degradability

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