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Effect of feeding high-temperature, microtime-treated diets with different lipid sources on conjugated linoleic acid formation in finishing Hanwoo steers¹

C. X. Xu^*,,2, Y. K. Oh^,2, H. G. Lee, T. G. Kim^#, Z. H. Li^*, J. L. Yin^*, Y. C. Jin^*, H. Jin, Y. J. Kim^||, K. H. Kim, J. M. Yeo^¶ and Y. J. Choi^*,3

^* Laboratory of Animal Cell Biotechnology, School of Agricultural Biotechnology, and and Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 130-712, Korea; and National Institute of Animal Science, RDA, Suwon 441-706, Korea; and School of Bio-Resources, PNU-Special Animal Biotechnology Center, Pusan National University, Gyeongnam 627-706, Korea; and ^# Agribrands Purina Korea Inc., Seongnam 463-808, Korea; and ^|| Department of Food Science & Biotechnology, Korea University, Chochiwon, Chungnam 339-700, Korea; and ^¶ Korea National Agricultural College, RDA, Suwon, 441-706, Korea

³ Corresponding author: cyjcow{at}snu.ac.kr

The present study was conducted to examine the effects of different plant oils or plant oil mixtures and high-temperature, microtime processing (HTMT) on the CLA content in Hanwoo steers. Experiment 1, consisting of 3 in vitro trials, was conducted to determine how the biohydrogenation of C18 fatty acids and CLA production were affected by fat sources (tallow, soybean oil, linseed oil, or mixtures of soybean oil and linseed oil) or HTMT treatment in the rumen fluid. The results showed that HTMT was capable of protecting unsaturated fatty acids from biohydrogenation by ruminal bacteria. The HTMT-treated diet containing 4% linseed oil (LU) and a supplement containing 2% linseed oil and 1% soybean oil treated with HTMT + 1% soybean oil (L₂S₁U+S₁) produced an increased quantity of trans-11 C18:1 and cis-9, trans-11 CLA, and a reduced quantity of trans-10, cis-12 CLA. Based on these results, in vivo studies (Exp. 2) were conducted with LU and L₂S₁U+S₁. These 2 treatments increased the content of cis-9, trans-11 CLA in LM compared with the control diet. The content of trans-10, cis-12 CLA in subcutaneous fat was also increased in the L₂S₁U+S₁ treatment compared with other treatments. The subcutaneous fat thickness in the LU treatment was decreased compared with the L₂S₁U+S₁ treatment. The LU treatment significantly decreased fatty acid synthase expression but simultaneously increased leptin expression. In this report, we showed that diets containing LU and L₂S₁U+S₁ were capable of increasing CLA in the intramuscular fat of beef.

Key Words: beef • conjugated linoleic acid • high-temperature microtime treatment • trans-11 C18:1