Abstract:
To explore the changes of main environmental parameters in the enclosed goat sheds in Chongqing area, one sheep barn was selected in Youzhouwuyang breeding farm in Chongqing City in this study.The temperature, relative humidity and wind speed inside and outside the sheep barn, as well as the carbon dioxide(CO
2) and ammonia(NH
3) concentrations at 0.3, 0.8 and 1.3 m above the ground in the sheep barn were measured at regular intervals from April 1, 2020 to March 31, 2021 for one year.The CO
2 and NH
3 concentrations were also analyzed in summer(June to August 2020) and winter(December 2020 to February 2021) at different moments(07:00, 10:00, 13:00, 17:00, 20:00).The results showed that From April 2020 to March 2021, the temperature inside and outside the test sheep barn varied seasonally, with the highest temperature in August 2020 and the lowest temperature in January 2021; the relative humidity inside and outside the sheep barn remained basically high throughout the year.The wind speed outside the sheep barn was relatively high in January to March 2021, followed by July to September 2020 and lowest in April to May 2020,while the wind speed inside the sheep barn is basically maintained at a low level.The highest CO
2 concentration was(768.80±57.26) mg/m~3 in January 2021(at 0.8 m from the ground); the lowest was(431.03±70.00) mg/m~3 in April(at 1.3 m from the ground).The CO
2 concentration at 0.3, 0.8, and 1.3 m above ground level varied dynamically at different times in summer and winter, and the CO
2 concentration at 0.8 m was higher than that at 0.3 and 1.3 m at different times.NH
3 concentration was the highest in November 2020 at 0.65 mg/m~3(at 1.3 m above ground level) and the lowest in March 2021 at 0.35 mg/m~3(at 1.3 m above ground level).NH
3 concentrations at 0.3, 0.8, and 1.3 m above ground level varied dynamically in summer and winter, with significant differences between the different height layers(P<0.05, except for 17:00 in summer), and NH
3 concentrations at 1.3 m were higher than those at 0.3 and 0.8 m at different times.The results indicated that the temperature, relative humidity, CO
2 and NH
3 concentration of the enclosed high-bed sheep house showed different distribution and change rules in Chongqing area.