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Effects on the Levels of Dietary Conjugated Linoleic Acid (CLA) Produced from Bio-Diesel By-Products on the Production and Composition of Dairy Cow Milk  

Kim, Sang-Bum (Dairy Science Division, National Institute of Animal Science, RDA)
Ku, Min-Jung (Dairy Science Division, National Institute of Animal Science, RDA)
Lim, Dong-Hyun (Dairy Science Division, National Institute of Animal Science, RDA)
Lee, Hyun-June (Dairy Science Division, National Institute of Animal Science, RDA)
Park, Sung-Jai (Dairy Science Division, National Institute of Animal Science, RDA)
Kwon, Eung-Gi (Dairy Science Division, National Institute of Animal Science, RDA)
Kim, Sam-Churl (Dept. of Animal Science(Insti. of Agri. & Life Sci.), Gyeongsang National Univ.)
Park, Joong-Kook (Dairy Science Division, National Institute of Animal Science, RDA)
Publication Information
Journal of agriculture & life science / v.45, no.5, 2011 , pp. 63-71 More about this Journal
Abstract
This study was conducted to determine the effects of increasing the dietary levels of conjugated linoleic acid (CLA) which is produced from bio diesel by-products, on milk yield, milk composition, and blood metabolites of mid-lactating dairy cows. A total of 20 mid-lactating dairy cows ($631{\pm}25.0kg$) were assigned to one of four treatment groups and fed twice daily an equal amount of a basal diet ($NE_L$ 32 Mcal/d, CP 17%) contained 12kg/d of concentrate, 15kg/d of corn silage and 4kg/d of the hay mixture (tall fescue+orchard grass). Conjugated linoleic acid were fed for 2 weeks of adaptation periods and 4 weeks of collection periods at 0 (Control), 50 (T1), 100 (T2) and 150g/d (T3), respectively. By the increases of dietary CLA supplementation, milk yield and 4% fat corrected milk increased, whereas milk fat content decreased (p<0.05). The concentrations of stearic acid and oleic acid decreased with increasing dietary CLA supplementation, while the concentrations of total CLA increased (p<0.05). In conclusion, this study shown that the supplementation of dietary CLA manufactured from bio diesel by-products could improve milk yield and CLA concentrations of milk in mid-lactating dairy cows.
Keywords
Dairy cow; Conjugated linoleic acid; Milk yield; Milk composition;
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