Effect of Aerobic Deterioration on the Nutritive Value of Grass Silage

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  • FUJITA Hiroshi
    Laboratory of Animal Nutrition, Obihiro University of Agriculture and Veterinary Medicine
  • MATSUOKA Sakae
    Laboratory of Animal Nutrition, Obihiro University of Agriculture and Veterinary Medicine
  • TAKAHASHI Junichi
    Laboratory of Animal Nutrition, Obihiro University of Agriculture and Veterinary Medicine
  • FUKAZAWA Akira
    Laboratory of Animal Nutrition, Obihiro University of Agriculture and Veterinary Medicine
  • TAKASE Kenji
    Laboratory of Animal Nutrition, Obihiro University of Agriculture and Veterinary Medicine

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Other Title
  • 牧草サイレージの好気的変敗が栄養価におよぼす影響
  • ボクソウ サイレージ ノ コウキテキ ヘンパイ ガ エイヨウカ ニ オヨボス

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A comparative study was carried out to elucidate the effect of aerobic deterioration of grass silage on its nutritive value, with special reference to the changes in the efficiency of energy and nitrogen utilization in dairy cattle. Three dry Holstein cows were used for digestion, nitrogen balance and respiration experiments with two dietary treatments viz. (1) the silage affected by aerobic deterioration after opening the silo (AD-silage), and (2) undeteriorated silage taken from the other layers of the same silo (Control silage). In AD-silage, which had revealed a marked rise in temperatures(37.3-56.8°C) during the 3-7 day aerobic exposure period inside the silo, there was a tendency for the pH value to rise, followed by an increase in VBN and a decrease in organic acid contents when compared with the control silage, although there was no apparent difference in the general chemical composition between the two silages. In the feeding of these silages, significant decreases in the digestibility of organic constituents were observed in AD-silage. The decrease in digestibility was most prominent in the value for NFE fraction. Cows fed with AD-silage had greater nitrogen losses in their faeces and urine, and had a significant lower nitrogen retention values. In addition, oxygen consumption, carbon dioxide production and heat production per metabolic body size had increased in the cows fed with AD-silage, suggesting that there was a consistent decrease in the net availability of energy.

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