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Effects of Rumen Protected Oleic Acid in the Diet on Animal Performances, Carcass Quality and Fatty Acid Composition of Hanwoo Steers

  • Lee, H-J. (National Livestock Research Institute, RDA) ;
  • Lee, S.C. (National Livestock Research Institute, RDA) ;
  • Oh, Y.G. (National Livestock Research Institute, RDA) ;
  • Kim, K.H. (National Livestock Research Institute, RDA) ;
  • Kim, H.B. (Sawoo Oil company) ;
  • Park, Y.H. (National Livestock Research Institute, RDA) ;
  • Chae, H.S. (National Livestock Research Institute, RDA) ;
  • Chung, I.B (National Livestock Research Institute, RDA)
  • Received : 2002.08.16
  • Accepted : 2003.04.21
  • Published : 2003.07.01

Abstract

The effects of different rumen protected forms, oleamide, Ca oleate, of dietary oleic acid on the carcass quality and fatty acid composition in intramuscular and subcutaneous fat tissues of Hanwoo steer were examined. Sixty, 25 month old Hanwoo steers divided into three groups were fed no supplement (Control), 2% of oleamide (Oleamide) or Ca-oleate (Ca-Oleate) in their diet for 45 or 90 days. Disappearance rates of oleic acid supplements in digestive tracts (Rumen bypass, abomasal and intestinal disappearance rate) were 48.5, 68.4 for oleamide and Ca oleate, respectively. Both oleic acid supplements affected feed intake, growth rate, cold carcass weight and carcass fatness. Live weight gain, carcass weight, backfat thickness and marbling score were higher in the oleic acid supplemented steers compared with those from the control. Oleic acid supplements increased marbling score and ether extract in Hanwoo steer m. logissi thoracicmus. Rumen protected oleic acid increased not only the level of oleic acid but also polyunsaturated fatty acids in intramuscular and subcutaneous fat tissue. Total saturated fatty acid contents in both fat tissues were decreased whereas total unsaturated fatty acid content was increased compared with those from control. Linoleic acid, linolenic acid and polyunsaturated fatty acid contents were significantly higher in Ca oleate than any other steers. Lipid metabolites in blood were increased in rumen protected oleic acid treatments. HDL content in blood was increased in Ca-oleate supplemented steers whereas LDL was decreased compared with control. The changes of fatty acid compositions in the rumen protected oleic acid supplemented steers suggest that the oleic acid and unsaturated fatty acid were protected from rumen biohydrogenation and can be deposited in the fat tissues.

Keywords

Oleic Acid;Rumen Protected;Hanwoo;Fatty Acid Composition;Marbling

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