Journal of agriculture & life science (농업생명과학연구)

Institute of Agriculture & Life Science, Gyeongsang National University (경상대학교 농업생명과학연구원)
권호 표지

Effects on the Levels of Dietary Conjugated Linoleic Acid (CLA) Produced from Bio-Diesel By-Products on the Production and Composition of Dairy Cow Milk

바이오디젤유 부산물로 제조한 conjugated linoleic acid(CLA)의 첨가 수준이 젖소의 산유량 및 유성분에 미치는 영향

  • Kim, Sang-Bum (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Ku, Min-Jung (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Lim, Dong-Hyun (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Lee, Hyun-June (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Park, Sung-Jai (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Kwon, Eung-Gi (Dairy Science Division, National Institute of Animal Science, RDA) ;
  • Kim, Sam-Churl (Dept. of Animal Science(Insti. of Agri. & Life Sci.), Gyeongsang National Univ.) ;
  • Park, Joong-Kook (Dairy Science Division, National Institute of Animal Science, RDA)
  • 김상범 (농촌진흥청 국립축산과학원) ;
  • 구민정 (농촌진흥청 국립축산과학원) ;
  • 임동현 (농촌진흥청 국립축산과학원) ;
  • 이현준 (농촌진흥청 국립축산과학원) ;
  • 박성재 (농촌진흥청 국립축산과학원) ;
  • 권응기 (농촌진흥청 국립축산과학원) ;
  • 김삼철 (경상대학교 축산학과(농업생명과학연구원)) ;
  • 박중국 (농촌진흥청 국립축산과학원)
  • Received : 2011.09.30
  • Accepted : 2011.10.28
  • Published : 2011.10.31
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Abstract

This study was conducted to determine the effects of increasing the dietary levels of conjugated linoleic acid (CLA) which is produced from bio diesel by-products, on milk yield, milk composition, and blood metabolites of mid-lactating dairy cows. A total of 20 mid-lactating dairy cows ($631{\pm}25.0kg$) were assigned to one of four treatment groups and fed twice daily an equal amount of a basal diet ($NE_L$ 32 Mcal/d, CP 17%) contained 12kg/d of concentrate, 15kg/d of corn silage and 4kg/d of the hay mixture (tall fescue+orchard grass). Conjugated linoleic acid were fed for 2 weeks of adaptation periods and 4 weeks of collection periods at 0 (Control), 50 (T1), 100 (T2) and 150g/d (T3), respectively. By the increases of dietary CLA supplementation, milk yield and 4% fat corrected milk increased, whereas milk fat content decreased (p<0.05). The concentrations of stearic acid and oleic acid decreased with increasing dietary CLA supplementation, while the concentrations of total CLA increased (p<0.05). In conclusion, this study shown that the supplementation of dietary CLA manufactured from bio diesel by-products could improve milk yield and CLA concentrations of milk in mid-lactating dairy cows.

본 연구는 바이오디젤유 부산물로 제조한 공액리놀레산(Conjugated Linoleic Acid, CLA)을 비유중기 착유우에 첨가 수준을 달리하여 급여하였을 때 산유량, 유성분 및 혈액성상에 미치는 영향을 조사하고자 실시하였다. 공시동물은 비유중기 홀스타인 20두($631{\pm}25.0kg$)로 시험구당 5두를 배치하였으며, 기초사료($NE_L$ 32 Mcal/d, CP 17%)로 농후사료(12kg), 옥수수 사일리지(15kg) 및 톨페스큐+오차드그라스 건초(4kg)를 1일 2회 균등 급여하였다. CLA의 1일 급여수준은 0(대조구), 50(T1), 100(T2) 및 150g(T3)으로 달리하여 네처리군을 설정하고 예비 시험 2주와 본 시험 4주를 수행하였다. 착유우에 CLA의 급여량이 증가함에 따라 산유량과 4% FCM은 점진적으로 증가하였으나, 유지방 함량은 유의적으로 감소하였다(p<0.05). 사료중 CLA 첨가 수준이 증가함에 따라, 우유의 Stearic acid와 Oleic acid 함량은 감소한 반면, total CLA 함량은 증가하였다(p<0.05). 따라서 본 연구에서는 비유중기 착유우 사료에 바이오디젤유 부산물로 제조한 CLA를 첨가하는 것은 유생산량 증가와 유지방 내 CLA 함량 증가에 유리할 것으로 판단된다.

Keywords

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