《Table 1 Statistical characteristics of observation samples》

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《Study on Antibiotic Prophylactic Use Behavior and Influencing Factors of Livestock and Poultry Breeding Farms and Households from Risk Cognitive Perspective》

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Sample characteristics were shown in Table 1.There were 215 sample households of chickens，ducks and other poultry breeding households，accounting for 53.9%of the total sample size.There were 184 sample households of swine breeding farms and households，accounting for 46.1%of the total sample size.In terms of age distribution，households aged 41 to50 accounted for 37.3%，those aged 51 to 60 accounted for27.1%，those aged over 61 accounted for 9.0%，so their age structure was mainly middle-aged and old.In educational level，junior middle school education accounted for more than half（56.4%）.In the breeding years，23.3%were 3-6 years，20.3%were 6-9 years，and 20.5%were 9-12 years，showing balanced distribution.About 93.5%breeding farms had less than ten people.The surveyed breeding farms were mainly mediumsized and small ones，which is also manifested in breeding scale.Small breeding farms and households accounted for 81.7%，which reflects to a certain extent that small and medium-sized breeding farms and households play a great role.In the sales channel，35.9%of products were sold through dealers，small scale swine sales was mainly through"；swine brokers"；，chickens and ducks were mainly through cooperatives or chicken brokers and duck brokers.