Investigation On DON Pollution In Feed Mill Raw Material Corn

Vomiting toxin is a toxic secondary metabolite produced mainly by Fusarium in its pollution process.It not only seriously reduces the feeding value of feed,but also affects the production performance of livestock and poultry,but also endangers the health of livestock and poultry,leading to livestock and poultry death,and even affects human health through carrying or accumulating animal products.Corn is the largest raw material used in livestock and poultry feed in our country at present.However,corn in our country is seriously contaminated by mycotoxin.In order to provide safer and healthier livestock and poultry products for human society,the safety of feed is particularly important.Therefore,it is necessary to strengthen the detection and control of mycotoxin contamination in feed raw materials,especially in corn.The mycotoxins contaminated maize are vomiting toxin,aflatoxin,zearalenone and so on.This investigation only aims at the situation of maize vomiting toxin contamination.The samples were randomly collected from a feed manufacturer in Shandong Province.Corn was collected from Shandong,Hebei,Henan,Jiangsu,Inner Mongolia,Shanxi,Shaanxi,Tianjin,Liaoning,Jilin,Heilongjiang and other provinces and cities,which are the main corn producing areas in China.Due to the difference of purchasing and using quantity,the changes of vomiting toxin pollution in Shandong,Heilongjiang,Jilin,Liaoning,Hebei and Inner Mongolia in recent three years were compared.Enzyme-linked immunosorbent assay(ELISA)was used to detect the content of vomitin.The results are as follows:1.Vomiting toxin is greatly affected by temperature and humidity,especially during harvest period,which seriously affects the content and exceeding standard rate of maize vomiting toxin.It is also confirmed that Fusarium which mainly produces vomiting toxin belongs to field fungi.The pollution status of vomiting toxin in maize is affected by the weather factors during the growing and harvesting periods of maize.For example,in 2015 and 2016,rainfall in Jilin Province was higher than that in the same period,resulting in the average content of maize vomiting toxin in Jilin Province purchased and used in 2016 and2017 was 0.609 mg/kg and 0.562 mg/kg,which belonged to moderate pollution.Due to the general rainfall in Hebei province in autumn 2017,the average content of maize vomiting toxin in Hebei province purchased and used in 2017 and 2018 increased from 0.464 mg/kg in2016 to 0.547 mg/kg in 2017 to 0.870 mg/kg in 2018,which turned into moderate pollution.2.The content and rate of vomiting toxin in Maize at different time in different areas are different.According to the detection data of the past three years,the quantity of purchases in the first and fourth quarters of each year is large,and the contamination of vomitoxin in maize is serious,which is moderate pollution.The quantity of purchases in the second and fourth quarters is small,and the contamination of vomitoxin in maize is generally light,which is mild pollution.According to the situation of producing area,the pollution of maize vomiting toxin in Shandong and Inner Mongolia in recent three years is better,the average content and the rate of exceeding the standard are lower;Jilin and Liaoning in Northeast three provinces are relatively better,followed by Heilongjiang;Hebei province is less polluted by maize vomiting toxin in 2016 and 2017,but due to the rainfall during maize harvest in 2017,it caused 2018.Vomitoxin contamination is serious.In addition,because the first quarter and the fourth quarter of each year are the main time nodes of maize market in China,the direct purchasing quantity of Maize in feed factories is large.During this period,the pollution of maize vomiting toxin is serious,and the average content and the rate of exceeding the standard are generally high.This is consistent with the fact that the fungi producing vomiting toxins belong to field fungi.In the second and third quarter of each year,feed mills mainly provide maize from high quality suppliers.Maize is generally treated by color selection and other means.Therefore,the detection at this stage shows that the content of vomitoxin and the rate of exceeding the standard will decrease significantly.Through machine color selection,the pollution of some vomiting toxins to feed can be reduced by reducing the entry of mildewed broken corn and immature corn into feed production.The pollution of vomiting toxin has a serious impact on the production of livestock and poultry.Based on the analysis of the detection data of maize vomiting toxin in recent three years,the pollution of maize caused by vomiting toxin is preliminarily explored,which can provide reference for the safety of feed quality and food safety,and control the loss.According to the actual situation of feed production process,to control the content of vomitoxin pollution in feed products,it is necessary to strictly control the pollution of vomitoxin in feed raw materials,especially in corn.