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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2009;22(8): 1151-1159.
https://doi.org/10.5713/ajas.2009.90096    Published online June 26, 2009.
Effects of Flaxseed Diets on Performance, Carcass Characteristics and Fatty Acid Composition of Hanwoo Steers
Chong-min Kim, Jeong-hoon Kim, Young-kyoon Oh, Eun-kyu Park, Gyu-chul Ahn, Gang-yeon Lee, Jung-il Lee, Keun-kyu Park
This study was conducted to determine the effects of dietary level of whole flaxseed (WFS; 0, 10 and 15%) on performance, carcass characteristics and fatty acid composition of serum and subcutaneous, perirenal, and intramuscular adipose tissues of Korean Hanwoo cattle. The daily gains were not different among treatments. Dietary inclusion of WFS decreased (p<0.05) feed intake but improved (p<0.05) feed conversion ratio (feed/gain). Backfat thickness and marbling score were increased (p<0.05) by dietary WFS. Carcass weight, dressing percentage, loin-eye area, and carcass yield and quality were not different among treatments. The proportion of C18:3 in serum and, to a lesser extent, in adipose tissues were increased (p<0.01) by dietary WFS, indicating that lipids from WFS escaped ruminal biohydrogenation. Animals fed WFS had lower proportions of saturated fatty acid (SFA; C14:0 and 16:0) and higher proportions of polyunsaturated fatty acids (PUFA; C18:2. 18:3, 20:2, 20:4, 20:5 and 22:6) in perirenal and intramuscular fat than animals fed diets without WFS, resulting in an increased PUFA/SFA ratio. Furthermore, feeding WFS increased (p<0.01) proportions of -3 and -6 fatty acids in intramuscular fat but decreased (p<0.05) the -6/-3 ratio. Relative treatment effects were similar between 10 and 15% WFS. Feeding WFS can effectively alter composition of adipose tissues with enhanced feed conversion ratio.
Keywords: Hanwoo Steer; Whole Flaxseed; Carcass Characteristics; Oilseeds; Fat Supplementation; Fatty Acid; Adipose Tissue

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