Influence of the Variety and Harvesting Date on the Nutritive Value of Corn Plants and Investigation of the Nutritive Value of Corn Silages Prepared from 7-Varieties of Corn

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  • とうもろこしの品種・刈取時期と,とうもろこしサイレージの栄養価について
  • トウモロコシ ノ ヒンシュ カリトリ ジキ ト トウモロコシ サイレージ ノ

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The changes of the nutritive value and dry matter yield of corn plants with stage of maturity was investigated for 50 days from September to October in 1974 in Hokkaido prefecture. Corn plants used in this experiments were three varieties such as HEIGENWASE, KO-No 8 and GIANTS. In relation to above experiments, the investigation of the nutritive value of corn silage was carried out by detailed analysis of carbohydrates. Corn silage used in this experiments were 15 samples, from early milk to glazed stage of maturity prepared from 7 corn plants, and carbohydrates analysis was done to total carbohydrates, mono-oligo saccharides, starch and structural carbohydrates. Dry matter yield was held constant from the end of September, but percent of grain in whole plant dry matter was increased subsequently in three varieties. Change of TDN contents which was predicted by laboratory method was not exceed 10% for 50 days of experimental period. In 15 silages, mean value±standard deviation of crude protein, crude fat, lignin, total carbohydrates, mono-oligo saccharides, starch, structural carbohydrates contents of silage dry matter and total carbohydrates contents in organic matter were 9.1±1.1, 3.2±0.6, 3.8±0.7, 77.8±1.8, 2.2±1.6, 15.0±8.4, 60.6±7.2 and 82.9±1.2% respectively. TDN contents of 15 silages were widely distributed from 60.7 to 73.1% and contents of digestible carbohydrates strongly influenced the TDN contents more than digestible crude protein or digestible crude fat. There was high negative correlation. (r=-0.91, p<0.01) between the contents of digestible non-structural carbohydrates (mono-oligo saccharides and starch) and digestible structural carbohydrates.

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