Studies on Utilization of Soiling Forage Grasses in Warmer Districts of Japan : VIII. Feeding Value of Italian Ryegrass Hay cured at Different Stages of Maturity

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  • 暖地におけるイネ科青刈り飼料の利用に関する研究 : VIII.イタリアンライグラスの刈取り期間別の飼料価値
  • 暖地におけるイネ科青刈り飼料の利用に関する研究-8-イタリアンライグラスの刈取り期間別の飼料価値
  • ダンチ ニ オケル イネカ アオガリ シリョウ ノ リヨウ ニ カンスル ケンキュウ 8 イタリアンライグラス ノ カリトリ キカン ベツ ノ シリョウ カチ

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Studies were made on the influence of stage of maturity upon the feeding value of Italian ryegrass hay which was cut at the following four stages, viz, 1) vegetative stage, 2) stages between the periods of young panicle formation and the boot leaf, 3) stages between the heading and the before-milky and 4) stages between the flowering and the milky. Chemical analyses and digestion trials were conducted to evaluate feeding value of the hay. Sheep were used as the experimental animals. Italian ryegrass samples were collected by the same quantity on every cutting date during the periods of 20〜40 days for each stage, and were analyzed chemically. The results can be summarized as follows : 1. The digestibility of crude protein, crude fat, NFE and also crude fiber decreased with advancing maturity. 2. The DCP contents of the forages cut during the period of the vegetative-and the boot leaf stage were high (12.1〜21.0%), but these values decreased to 4.5〜8.6% with advancing maturity. In the vegetative period, the DCP contents of the forages cut during the period of late November and early March were greater than those of the forages cut at early and late March. In the forages cut during the period of the heading-and the before-milky stage, the DCP content of the first crop sown at later season was greater than that of the second or the third crops sown at earlier season. 3. The TDN contents of the forages cut during the period of the vegetative-and the boot leaf stage were high (70.4〜87.3%), but these values decreased to 58.7〜71.9% with advancing maturity. The TDN content of the first crop cut during the period of young panicle formation-and the boot leat stage was greater than that of the second crop. In the forages cut during the period of the heading-and the before-milky stage, the TDN content of the first crop sown at later season was greater than that of the second or the third crops sown at earlier season.

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