Detection Of Different Biological Stress Factors In Duck House And Impacts On Welfare And Related Immune Indicators

In this study, different biological stress factors in duck environment to detect and investigate their effect on the duck welfare indicators and related immune function. The test Select 280 birds a day-old cherry valley duck brood conducted three weeks.Select two hundred and fifty 21-day-old ducks similar weight were randomly divided into control group A, B, C, D, E five treatment groups.Fifty feathers in each group,and the control group A,group B、C、D、E of different processing, environment clean degree is gradient is excellent,good, medium, poor, very poor. In 28, 35, 42, 49, 56 days of age, when 8 am to test airborne endotoxin,airborne aerobic bacteria, airborne fungus concentration. And the middle of the blood leukocytes, granulocyte, cell number and the content of serum lysozyme to measure. In28, 42 and 56 days of age for each group of random three feather every in caecum microorganism flora, to measure the immune organ index. In each group take 6 every day age54 FA living measurement and gait score. The experimental data show :(1) Poor sanitation condition, which leads to the rise in airborne microorganisms.Excellent and bad environment depends largely on health management style. Control group A and group B-E inner airborne concentrations of aerobe in turn in the 0.46-1.81 × 104CFU(Colony Forming Unit)/m3(air)、0.69-5.07×104CFU/m3、0.68-5.76×104CFU/m3、0.59-5.96×104CFU/m3、0.71-8.93×104CFU/m3, between 0.71-8.93 x 104 cfu/m3; Inner concentration of airborne fungi in turn in the 0.11-2.54 × 104 CFU(Colony Forming Unit)/m3(air)、0.21-3.54×104CFU/m3、0.19-3.95×104CFU/m3、0.77-5.73×104CFU/m3、0.78-8.05 × 104CFU/m3;Inner airborne endotoxin concentration in 0.02-2.56 × 104EU(Endotoxin Unit)/m3(air) 、 0.04-7.24 × 104EU/m3、 0.003-1.024 × 104EU/m3、 0.011-1.448 × 104EU/m3 、 0.006-1.024 × 104EU/m3. Corral microbial aerosol and waste from animals, bedding, feed, etc. Barns planned to ventilation, clean, can lower the amount of particles suspended in the environment and microbial aerosol, improve air quality goals are met. As time goes on, every day by day grow up, feces, duck in airborne aerobic bacteria,fungi, the changes of endotoxin concentration significantly affected by different ventilation,clean condition.(2)With raising the environmental quality variation, the significant increase in biological factors of stress concentration in the air. The development of the immune organs affected by bad, to the body’s immune to resist the risks will adversely. Reduces the flesh duck the content of serum lysozyme, six to eight weeks, group B, C, D, E, respectively, compared with the control group by 6.7%, 12.9%, 17.4%, 12.9%. Every body’s cells, the immune system weakens inhibits the body’s immune function of the organization. Different breeding environment on every venous blood were not significantly affect total number of white blood cells.(3) Breeding duck with poor environment in the biological stress concentration factors significantly high, significant impact on every welfare. Under the environment of high concentrations of airborne microbes, every body in the cecum contents of e. coli concentration is high, the beneficial bacteria lactobacillus concentration is low, Appearance gait score group B, C, D, E, respectively, compared with the control group by 151%, 303%, 506%, 151%respectively. FA value of group B, C, D, E, respectively, compared with the control group A fell by 24%, 75%, 113% and 24% respectively. Every body condition, exercise less, inhibit the benign development of every welfare and health. With the improvement of aquaculture environment clean degree, every welfare level also rises as a whole.