寒区奶牛舍环境温湿度、粉尘和气载细菌的季节性变化及其相关性研究

doi:10.11843/j.issn.0366-6964.2016.03.028

Abstract

Abstract:

The objective of this study was to investigate the ambient parameters in dairy cowsheds and their correlation.Four styles of cowsheds in the chill region of Hebei province were used and the continuous record method，fixed spot and time determination method，plate count method were applied to investigate the ambient temperature and relative humidity，airborne dust concentration and airborne bacteria count in 4 seasons，respectively.The results indicated that the indoor temperature was high at noon and low in both the morning and evening，while the opposite tendency in the relative humidity was observed.The temperature-humidity index(THI) was above 72 in all cowsheds in summer，which suggested that heat prevention would be paid more attention in the cowsheds of chill regions.The dust concentrations in all cowsheds ranged from 28.5 to 211.5 μg•m^-3 of PM₁₀concentrations and from 1.9 to 44.2 μg•m^-3 of PM_2.5 concentrations.In each season，a significant difference was observed on the dust concentrations(PM₁₀ and PM_2.5) among 4 styles of cowsheds(P＜0.05).The PM₁₀concentrations depended on seasons，showing the highest value in summer and the lowest in winter.Moreover，the PM₁₀were significantly positively correlated with the temperature(P＜0.05，r=0.60)，while not significantly correlated with the relative humidity(P＞0.05).In addition，the aerobic bacteria counts ranged from 1 804 to 4 944 CFU•m^-3 and the bacteria among all cowsheds showed the significant difference in each season(P＜0.05)，and the bacteria counts were significantly positively correlated with temperature(P＜0.05，r=0.49) and the relative humidity(P＜0.05，r=0.56)，respectively.There was significantly positive correlation between bacteria counts and PM₁₀ concentrations(P＜0.01，r=0.80).In conclusion，the correlation among ambient parameters，including temperature，relative humidity，dust，airborne bacteria，and so on，would be considered to improve the environment in dairy cowsheds.

CLC Number:

GAO Yu-hong，GUO Jian-jun，LI Hong-shuang，QIU Dian-rui，LI Xiao-bin，WU Guang-jun，LI Jian-guo. Seasonal Variation of Ambient Temperature，Relative Humidity，Dust and Airborne Bacteria in Dairy Cowshed and Their Correlation in Chill Region[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2016, 47(3): 620-629.

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Seasonal Variation of Ambient Temperature，Relative Humidity，Dust and Airborne Bacteria in Dairy Cowshed and Their Correlation in Chill Region

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