Effect of Soybean Oil Supplementation on the Contents of Plasma Cholesterol and Cis9, trans11-CLA of the Fat Tissues in Sheep

S H Choi,Y K Oh,J H Wang,M K Song,Y J Kim

doi:10.5713/ajas.2006.679

Abstract

A feeding trial was conducted with 10 sheep for 12 weeks to examine the effect of soybean oil (SBO) supplementation on long-chain fatty acids composition, especially cis9,trans11-conjugated linoleic acid (c9,t11-CLA) in fat tissues. Sheep were fed either a SBO supplemented diet (5%, DM basis) or a control diet without SBO. Chopped rye grass hay was fed as roughage. Concomitant increases in contents of total cholesterol (T-C) and HDL-cholesterol (HDL-C) in the plasma of sheep were observed from the SBO supplementation. The supplementation of SBO reduced (p<0.05) the proportions of C16:1, C17:0 and C17:1 but increased (p<0.05) the proportions of C18:0 and octadecenoic acid (t11-C18:1) in the intramuscular fat. The C18:0 proportion only in the subcutaneous fat was increased (p<0.05) by the SBO supplementation. The SBO supplementation slightly increased CLA proportion in the intramuscular fat and subcutaneous fat. (Asian-Aust. J. Anim. Sci. 2006. Vol 19, No. 5 : 679-683)

Highlights

Research efforts have been intensified to increase the content of cis9,trans11-conjugated fatty acid (c9,t11-CLA) in meat and dairy products due to its potential health benefits such as anti-carcinogenic effect (Ha et al, 1987) and immune stimulating effect (Michal et al, 1992)
The present study was to see how the sheep respond to the fatty acid such as C18:2 in soybean oil (SBO) supplemented (5%, of total diets, DM basis), especially in the production of c9,t11-CLA and its deposition
Cholesterol content in blood plasma has been used to assess the changes in lipid metabolism by oil feeding

Summary

INTRODUCTION

Research efforts have been intensified to increase the content of cis9,trans11-conjugated fatty acid (c9,t11-CLA) in meat and dairy products due to its potential health benefits such as anti-carcinogenic effect (Ha et al, 1987) and immune stimulating effect (Michal et al, 1992). While most of the experiments regarding the CLA production has been made with C18:2-rich sunflower oil (Ivan et al, 2001) and safflower oil (Mir et al, 2000), C18:3-rich linseed oil can be an alternative source (Wang et al, 2002; Wang and Song, 2003). Mir et al (2000) indicated that dietary supplementation with safflower oil (6% of dietary dry matter) increased the c9,t11-CLA content of all tissues in lamb by more than 200%. Ivan et al (2001) released the increased c9,t11-CLA contents in various tissues in sheep fed the sunflower oil (6% of DM). The present study was, conducted to determine the effect of soybean oil (SBO) supplementation on contents of plasma cholesterol and c9,t11-CLA in adipose tissues of sheep

MATERIALS AND METHODS

RESULTS

DISCUSSION