Effects of Washing Used Equine Bedding Straw on Ammonia Gas Emission Prior to Drying

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  • SUKEMORI Seizi
    Tokyo University of Agriculture, Faculty of Agriculture, Department of Animal Science
  • ENDO Daisuke
    Tokyo University of Agriculture, Faculty of Agriculture, Department of Animal Science
  • IKEDA Shuhei
    Tokyo University of Agriculture, Faculty of Agriculture, Department of Animal Science
  • TAKASAKI Kouhei
    Tokyo University of Agriculture, Faculty of College, Department of Biological Production Technique
  • KURIHARA Yoshio
    Tokyo University of Agriculture, Faculty of Agriculture, Department of Animal Science

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  • 軽種馬の敷き料乾燥前の水洗処理がアンモニアガス発生に及ぼす影響

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The present study aimed to evaluate the effects of washing used equine bedding straw before drying on ammonia gas emission in a model experiment. At first, concentrations of ammonia gas emission from pre-and post-washing bedding straw with 10 fold its weight of water, prepared with rice straw and equine urine, were determined by a passive dositube and the values were calculated with respect to the stable conditions in the equine barn as an intensity of odor. In determining ammonia gas emission, washing of bedding straw with 10 fold its weight of water reduced emissions by 35.6% from the largest value. This reduction corresponds to a 0.5 point reduction in the intensity of odor. Prior to the determination of nitrogen volume for ammonia gas emission, uric voluntary nitrogen determination apparatus was established and its performance was evaluated. Using this apparatus, nitrogen emission was determined for pre-and post-washing of bedding straw, and the nitrogen volume in non-treated rice straw, urine, and pre- or post-washed bedding straw was also determined. In the results of nitrogen balance determined with the trial apparatus, washing reduced 60% of the ammonia gas emission from the bedding straw. Secondly, the appropriate washing water weight (5, 10 and 15 fold) for the used bedding straw weight was evaluated according to the nitrogen levels in the washing water. While the nitrogen concentration decreased in accordance with the increase in washing water volume, there was no significant difference in the nitrogen leve 1s, which was less than the sewage disposal standard. Therefore the washing of used bedding straw seemed to be a useful method before drying them for recycle use. However, some problems related to the washing water and bedding straw endurance remains to be clarified before the actual use of this treatment.

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