Detection Of Ammonia Emissions In Different Types Of Pig Manure During Winter

The NH₃ of livestock and poultry excrement has a certain impact on the livestock and poultry,while it also seriously crisis the living environment and atmospheric environment of its surrounding residents,and the environmental pollution caused by this has become the focus of the global research.Research on NH₃ emissions and influencing factors in livestock production process is an important step to reduce NH3 emissions.Therefore,the static box method was used to study the effect and regularity of the fecal NH₃ emissions of different kinds of pigs?back-up sows,fattening pigs and piglets?under the condition of 15and 30cm stacking height covering?corn straw?or without covering.During the test,the main conclusions are as follows:?1?The emission rules of ammonia in different kinds of pigs are also different.The NH3 emissions from the four treatment groups of the sows reached a peak within a week,then decreased to the end of the gas release.The ammonia emission law of different treatment groups is similar to that of finishing pigs during stacking.The emissions are large in the 7 days or so,and then less.Until the later stage,there is no obvious emission.The emission rule of piglets in different stages had no similar performance but fluctuated to varying degrees.There is a trend that the treatment group descends earlier and then rises sharply.And there are several days before and after several days of fluctuation.The treatment continued to increase and reached the highest emission value in a week or so.After that,all the treatments gradually decreased,and then continued until the gas release ended.?2?There is a significant difference in gas emission between different types of pigs.There was a significant difference between the backpacking sows at different stacking heights and no covering treatments?P<0.01?;On the basis of the same stacking height,there was a significant difference between straw mulching and no mulching treatments?P<0.01?;The difference between the two groups of finishing pigs was significant?P<0.01?;There was a significant difference between the two groups?P<0.01?;The NH3emissions of the piglets were significantly different?P<0.01?,and the different stacking height and coverage of different kinds of pigs were not significant?P>0.05?.?3?There are different differences in gas emissions between different kinds of pigs during the discharge period.The cumulative ammonia emissions in the early stage of the sow were significantly higher than those in the middle and late stages.The emission level in the middle stage was low,and the late emission was close to zero emissions.The discharge of the fattening pig is still more than that in the middle and later stages of the early stage,and the ammonia emissions in the mid-term and later period of the fattening pig are far below the earlier and half of the early stage.Piglets also gathered in the early stage of emission,and the emissions in the middle and late stages weakened,especially the late ammonia emissions were extremely small.?4?The cumulative emission of NH₃ of pig manure per unit of each treatment group was 47.52¹20.48mg/kg,of which,the height of the piglet stacking height 15cm was the lowest,and the height of 30cm without cover was the highest.The cumulative emissions of NH₃ of different kinds of pigs were fattening pigs>sows>piglets;the cumulative emissions of NH₃ in different treatment groups were H30>H15>H30C>H15C.