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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2006;19(7): 970-977.
https://doi.org/10.5713/ajas.2006.970    Published online May 25, 2006.
Effect of Location, Season, and Variety on Yield and Quality of Forage Oat
J. D. Kim, S. G. Kim, S. J. Abuel, C. H. Kwon*, C. N. Shin, K. H. Ko
Correspondence:  C. H. Kwon,
Forage oat (Avena sativa L.) is grown extensively in a double-cropping system on dairy farms. Four oat varieties (??Swan?? ??Targa?? ??Foothill?? and ??Nugene?? were evaluated for forage production and forage quality during two growing seasons (spring and autumn) at two locations (central and southern region) in South Korea. The heading stage of four oat varieties was observed during spring, but the autumn season did not produce heading until harvest time except for the ??Swan??variety (early-maturing variety). The heading stage of ??Swan??in both locations was earlier compared to other varieties. The four varieties were resistant to both foliar disease and insects. Lodging resistance was higher during autumn except in 2002 at the central region, and late-maturing varieties (??Foothill??and ??Nugene?? have lower lodging resistance. Dry matter (DM) content was significantly different between varieties (p<0.001). Comparing different varieties, ??Swan?? an early-maturing variety, was highest in DM content. In DM, total digestible nutrients (TDN) and crude protein (CP) yield, the yield of oat varieties in the southern region was higher than in the central region, and forage yield of the oat varieties in the spring season was higher than during the autumn season. The DM and TDN yield showed significant differences between oat varieties. The CP content of oats grown in the central region (Cheonan) was lower than oats grown in the southern region (Daegu), and the spring season produced oats with lower CP compared to the autumn season. Among the four oat varieties, the CP content of latematuring varieties was higher than the Swan variety (early-maturing variety). The acid detergent fiber (ADF) and neutral detergent fiber (NDF) contents were higher for the varieties grown in Cheonan and during the spring season. The ADF and NDF contents of latematuring varieties were lower than the early-maturing variety. TDN and relative feed value (RFV) were higher for the varieties grown in Daegu and during the autumn season. Late-maturing variety had higher TDN and RFV than early-maturing variety. Our study showed differences in forage production and forage quality of oats grown in different locations, seasons and varieties. Forage quality as well as forage production was better in the southern region than in the central region. Forage quality was better during autumn, but forage production was better during spring. Late-maturing variety had better forage quality than the early-maturing variety. Therefore, latematuring varieties are more suitable for use in the southern region.
Keywords: Double-cropping System; Early-maturing; Late-maturing; Selection of Variety

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