Effects of Feeding Eucommia ulmoides Leaves Substituted for Rice Straw on Growth Performance, Carcass Characteristics and Fatty Acid Composition of Muscle Tissues of Hanwoo Steers

볏짚을 두충잎으로 대체급여 시 거세한우의 생산성, 도체특성 및 육의 지방산 조성에 미치는 영향

  • Kim, J.H. (Korea Applied Microorganism Industrial Research) ;
  • Kim, Y.M. (Livestock Products Sanitation Division, Ministry of Agriculture and Forestry) ;
  • Lee, M.D. (Busan Metropolitan City Agriculture Technology Center) ;
  • Shin, J.H. (College of Agriculture and Life Science, Gyeongsang National University) ;
  • Ko, Y.D. (College of Agriculture and Life Science, Gyeongsang National University)
  • 김재황 (한국응용미생물산업연구소) ;
  • 김영민 (농림부 축산물위생과) ;
  • 이문도 (부산시 농업기술센터) ;
  • 신재형 (경상대학교 농업생명과학대학) ;
  • 고영두 (경상대학교 농업생명과학대학)
  • Published : 2005.12.31


This study was conducted to examine the growth performance, carcass characteristics, physico-chemical properties and fatty acid composition of muscle tissues of Hanwoo steers when they were fed diets containing four levels of E. ulmoides leaves. Steers were allotted to one of four dietary treatments, which were designed to progressively substitute Eucommia ulmoides for 0, 3, 5 and 10% of the rice straw in the basal diet. Seventy two Hanwoo steers (321±13kg) were used. Average daily gain (0.81-0.86kg) and feed conversion (10.05-10.59) were not changed by feeding E. ulmoides leaves. Emission of fecal ammonia gas was decreased by increasing substitution levels of E. ulmoides leaves. Emission of ammonia gas in feces of steers were significantly (p<0.05) decreased in the 5% and 10% treatments at 40℃ compared with in control (30.6ppm) and 3% treatment (29.8ppm), respectively 20.3 and 21.6ppm. Back fat thickness was higher (p<0.05) in steers fed control diet (15.0mm) than 5 and 10% E. ulmoides diets (10.2 and 10.5mm respectively). The grade ‘A’ appearances of meat yield of steers were increased up to 20% by the 3% substitution of E. ulmoides leaves, and the grades ‘1+’ and ‘1’ appearances of meat quality were significantly improved (p<0.05) by the 5 and 10% Eucommia ulmoides feeding. There was no statistical difference in meat color of loin and top round among all treatments. It appeared that the 5% and 10% E. ulmoides leaves feeding affected (p<0.05) a increase in oleic acid concentration in loin and top round muscles. The concentration of serum cholesterol was lower (p<0.05) in steers fed 10% E. ulmoides (53.3mg/100g) than that of the other treatments (55.7-57.0mg/100g). The diarrhea incidence was about 20.26% in control, while it was lower (p<0.05) in the 5 and 10% E. ulmoides leaves treatments (10.4-12.5%) than control. There was no statistical difference in the occurrences of respiratory disease among all treatments. It is concluded that E. ulmoides leaves should be a prospective feed additive because it contains various functional substances. It is likely that air-dried E. ulmoides leaves can reduce the back fat thickness of Hanwoo steers and the occurrences of diarrhea. Therefore, the 5 and 10% substitution of E. ulmoides for roughage are highly recommended to be used in practice.


Eucommia ulmoides;Daily gain;Ammonia gas;Back fat thickness;Serum cholesterol


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