| More and more wastewater is produced with the rapid development of concentrated swine farms, which is in considerable contradiction with the water resource shortage in our country. A hoop structure swine production system was designed aiming to reduce wastewater from swine production. A 100-head hoop structure for fattening swine was built in Beijing, the growth performance of pigs and the environment status in the hoop structure were studied and compared with those of control in typical brick-concrete concentrated swine house. Results showed:Newly-designed hoop structure reduced wastewater significantly. In summer, wastewater mean for its control was up to 20 L/d per finishing pig. In spring, the typical brick-concrete concentrated swine house discharged 5 L/d per pig. The wastewater averaged 0.2 L/d per head finishing pigs in hoop structure in spring and summer.The nocuous and greenhouse gas inside hoop structure is lower than those in control house. The concentration of NH3, CO2, CH4 and N2O averaged 6.813.4 mg/m3, 1529.7±363.9 mg/m3, 5.0±2.3 mg/m3 and 0.73±0.16 mg/m3, respectively inside hoop structure, the corresponding values in control house were 16.7±3.9 mg/m3, 2557.3±515.2 mg/m3, 4.4±1.5 mg/m3, and 0.82±0.06 mg/m3, respectively. In spring, the concentration mean of NH3,CO2,CH4 and N2O in hoop structure were 5.9±2.7 mg/m3, 2182.5±1376.3 mg/m3, 4.05±2.50 mg/m3 and 0.35±0.11 mg/m3, respectively, the NH3, CO2, CH4 and N2O concentration averaged 14.5±2.3 mg/m3, 2965.6±1177.9 mg/m3, 4.91±1.70 mg/m3 and 0.52±0.03 mg/m3 in control house, respectively.The thermal environment were almost the same in both the hoop structure and control house. The average air temperature in the hoop structure was less than that in control house (26.5℃vs 27℃in summer, 18.9℃vs 21.0℃in spring), but the relative humidity was slightly higher than that of control (77% vs 71% in summer, 50% vs 49% in spring).The growth performance of pigs in both the hoop structure and the control house showed no significant difference. In summer the average daily gain and feedrgain ratio of pigs raised in hoop structure were 729g/d and 2.86, respectively, which were 2% higher and 3% lower than those of pigs fed in control house with the average daily gain of 716g/d and feed:gain ratio of 2.95. But opposite result appeared for the spring trial, pigs in hoop structure had average daily gain of 703g/d, which was 1.7% lower than that of pigs in control house with average daily gain of 715g/d.Two different floor designs of hoop structure and different sizes of pig group were compared to investigate the effects of floor structure and group size on the growth performance of pigs. Results showed that bedding area/concrete area of 1:2 was better than that of 2:1, the size of pig group has no significant effect on the growth performance animal.
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