How providing pigs with low protein diet affects nitrogen dynamics and ammonia emission during feces composting
2010
Onoue, T., Fukuoka-ken. Agricultural Research Center, Chikushino (Japan) | Tachibana, F. | Samegai, Y. | Koyama, F. | Teshima, N. | Yamaguchi, S. | Asada, K.
The objective of this study was to determine ammonia emission during composting of swine manure from a low protein diet. Feces and urine of pigs fed CP 14.5% (standard) or 11.5% (low protein) diet were mixed. The percentage of urine content was 20 or 30% in each of the feces. A water adjustment for each feces was made with 55% using perlite. The composting materials were aerated after being filled in a laboratory-scale composting system. The dry matter and organic matter degradation rates were equal. Decreasing dietary CP reduced maximum concentration and amount of ammonia emission during composting to 48.8% and 43.0%. However, a higher urine addition increased ammonia emission.
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