A Study on the Nutrient Production of Sudangrass , Pioneer 931 and Pioneer 988 during the First Growth and the Regrowth

Sudangrass , Pioneer 931 및 Pioneer 988의 예취차별 영양소 생산량에 관한 연구

The production of dry matter, general composition, hemicelluose and cell contents and in vitro digestible dry matter, cellulose and crude protein production were investigated in the Sudangrass and the hybrid of Sudangrass x sorghum, Pioneer 931 and Pioneer 958 during the first growth and the regrowth. 1. Dry matter yield of Sudangrass showed the highest value among the cultivars tested, being 1,638kgper 10a, those of the Pioneer 988 and Pioneer 931 showed 1,404kg and 1,282kg respectively. The effect of the first growth and the regrowth on the dry matter production of Sudangrass and Pioneer 988 was relatively small. 2. The in vitro digestibility of cellulose and the estimated digestible energy value per kg had a trend to be lower in order of Pioneer 931, Pioneer 988 and Sudangrass. But the production of digestible energy per 10a was decreased in order of Sudangrass, Pioneer 958 and Pioneer 931, which produced 4,623, 4,170 and 3,970 Mcal, respectively. 3. The cultivars did not affect on the in vitro digestibility of dry matter, while the yields of digestible dry matter were decreased in the order of Sudangrass, Pioneer 988 and Pioneer 931, which showed 1,068, 939 and 893kg per 10a, respectively. The yields of digestible protein lowered in order of Pioneer 931, Sudangrass and Pioneer 988, which were 134, 130 and 102kg per 10a, respectively.

Sudangrass와 Sudangrass${\times}$Sorghun의 交雜種인 Pioneer 931과 Pioneer 988의 乾物生産量, 一般組成分 生産量, hemicellulose와 世胞內容物 生産量 그리고 乾物, 纖維素의 消化率 및 可消化에너지와 可消化蛋白質을 調査하였다. 1. 10a當 乾物生産量은 Sudangrass가 1,638kg으로 가장 많았고, Pioneer 988은 1,404kg, Pioneer 931은 1,282kg으로 적었다. Sudangrass와 Pioneer 988은 刈取次에 따른 影響이 比較的 僅小하였으나 Pioneer 931은 3次 刈取次에 産量의 11%로서 매우 적었다. 2. 纖維素는 消化率과 kg當 可塑化에너지값은 Pioneer 931, Pioneer 988 및 Sudangrass 順으로 낮아지는 傾向을 나타냈다. 그러나 10a當 可塑化에너지 生産量은 Sudangrass, Pioneer 988 및 Pioneer 931 順으로 各各 4,623, 4,170 및 3,970 Mcal였다. 3. 乾物의 in vitro 消化率은 草種間에 뚜렷한 傾向이 없었으나 可消化乾物 生産量은 Sudangrass, Pioneer 988 및 Pioneer 931에서 10a當 各各 1,068, 939 및 893kg의 順이었다.의 順이었다.