Effect of Nitrogen Application Level and Regrowth Period on Composition of Fatty Acid in Tall fescue and Bermudagrass
2009
Park, H.S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Hwang, K.J., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Park, N.G., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kim, Y.J., Korea University, Jochiwon, Republic of Korea | Jeong, H.Y., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Jo, N.C., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Ko, M.S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea
Two experiments were conducted to evaluate the effects of nitrogen (N) application level and regrowth period on the fatty acid (FA) concentration and forage production of tall fescue (Festuca arundinacea Schr.) and bermudagrass (Cynodon dactylon (L.) Pers.). N was applied at 0, 50 and 100 kg/ha, and swards were cut after regrowth periods (15d, 30d and 45d). Concentrations of individual FA were determined by gas chromatography. FA composition of tall fescue contains a high proportion (87~88%) of total FA contents as palmitic (C16:0), linoleic (C18:2) and linolenic acid (C18:3). The FA composition was not affected by N application, but a longer regrowth period significantly (p less than 0.05) decreased the composition of linolenic acid (C18:3) and increased those of linoleic acid (C18:2). The FA composition of bermudagrass was not affected by N application, but a longer regrowth period significantly (p less than 0.001) decreased the composition of linoleic (C18:2) and linolenic acid (C18:3). Linoleic and linolenic acid of tall fescue were higher than those of bermudagrass. Dry matter (DM) yield of bermudagrass was significantly (P less than 0.05) affected by N application level and regrowth period. DM yield was higher at high N application and was higher at longer regrowth period. The crude protein concentration was higher at high N application and was low at longer regrowth period. Application of nitrogen fertilizer increases dry matter (DM) yield and crude protein (CP) content of bermudagrass. These studies demonstrate opportunities to affect the FA concentration and composition of FA in forage through management strategies, which could affect milk FA composition.
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