Production of Lean Beef Containing a High Content of trans-10, cis-12 Conjugated Linoleic Acid by Feeding a High-Temperature-Micro-Time-Treated Diet with Extruded Soybean

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  • XU Chengxiong
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • LEE Honggu
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • LEE Bokyun
    Agribrands Purina Korea Inc.
  • WANG Jihui
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • HONG Zhongshan
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • KIM Taegyu
    Agribrands Purina Korea Inc.
  • KANG Sangkee
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • CHOI Naggin
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University
  • ROH Sanggun
    Department of Food Production Science, Faculty of Agriculture, Shinshu University
  • CHOI Yunjaie
    Department of Animal Science, School of Agricultural Biotechnology, Seoul National University

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  • Production of Lean Beef Containing a High Content of<i>trans-10</i>,<i>cis-12</i>Conjugated Linoleic Acid by Feeding a High-Temperature-Micro-Time-Treated Diet with Extruded Soybean

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Abstract

The effects were observed of feeding a high-temperature-micro-time (HTMT)-treated diet of high-quality extruded soybean (ESB) on trans-10, cis-12 conjugated linoleic acid (CLA) incorporation in intra-muscular fat and on the lipid metabolism of twelve Holstein steers. The animals were randomly allocated to three groups, the control group being fed on a normal diet, and the other two groups being fed on a diet containing high-quality ESB with or without the HTMT treatment. The experimental period was four months. The content of total CLA in both the HTMT and non-HTMT-treated diets was higher than that in the control diet (P<0.05). The concentration of trans-10, cis-12 CLA was significantly higher in the HTMT-treated diet than in the non-treated diets at P<0.05, and the HTMT-treatment decreased the intra-muscular fat content (P<0.05). The expression of fatty acid synthase (FAS) and the plasma insulin-like growth factor-1 (IGF-1) level in the HTMT-treated group were lower than those in the control group (P<0.05). Lipoprotein lipase (LPL) mRNA level in the adipose tissue was lower in the non-HTMT-treated group than in the control (P<0.05). These results show that the HTMT treatment increased the level of trans-10, cis-12 CLA in the intra-muscular fat. This increased level of trans-10, cis-12 CLA may inhibit lipogenesis in the intra-muscular fat of Holstein steers.

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