Hypochlorous acid helps to disinfect pig farms effectively

Disinfection is one of the important biosecurity measures in pig farms. Commonly used disinfection methods in pig farms include physical disinfection, chemical disinfection and biological disinfection, among which chemical disinfection is the most commonly used. The correct selection and use of chemical disinfectants is the key to determine the effect of disinfection in pig farms. Chlorine disinfectant is a kind of high-efficiency disinfectant, which has a powerful killing effect on bacteria and viruses. Chlorine disinfectants commonly used in clinic include sodium hypochlorite (such as 84 disinfectant), calcium hypochlorite (bleach), sodium dichloroisocyanurate, sodium trichloroisocyanurate and so on. Hypochlorite disinfectant is a new type of chlorine-containing disinfectant, not only bactericidal broad-spectrum, fast-acting, high bactericidal efficiency, but also has the advantages of minimal corrosiveness, no irritating odour, high security, no pollution of the environment and so on. It is expected to replace the more irritating sodium hypochlorite, sodium dichloroisocyanurate and other traditional chlorine disinfectants.

The researcher used different concentrations of disinfectants as experimental objects to study the killing effect on common pathogenic bacteria and viruses in pigs, to provide reference basis for the selection and use of disinfectants in pig farms, and its experimental results are as follows:

As can be seen from the result, the logarithmic kill values of the original disinfectant (210 mg/l hypochlorous) and the 1:2 times diluted disinfectant (105 mg/l hypochlorous) on SS2 ZY05, APP5 KL, HPS4 JS, ERES, and ETEC O139 strains were all over 7.00 for 30s, 1min, and 5min, and the kill rates were 100%; 1:4 times diluted disinfectant (52.5 mg/l hypochlorous) on HPS4 JS, ERES, and ETEC O139 strains for 1min, and 5min. 100%; 1:4 times dilution of disinfectant (hypochlorous content of 52.5 mg/L) was used for 1 min against HPS4 JS, ERES and ETEC O139, and for 5 min against SS2ZY05 and APP5 KL, the logarithmic values of killing were all >7.00, and the killing rates were all 100%.

As shown in Table 2, the mean logarithmic inactivation of PEDV JS2012 and PPV BJ was ≥5.0 and the killing rate was ≥99.999% after 1, 5 and 10 min of interaction between the original disinfectant solution (210 mg/l hypochlorous) and the virus solution. The mean logarithmic inactivation value of the disinfectant solution (hypochlorous content of 52.5 mg/L) against PEDV JS2012 for 10 min was 5.00, and the killing rate was 99.999%; the mean logarithmic inactivation value of the disinfectant solution (1:2 times dilution) against PEDV JS2012 for 1 min was 4.00, and the killing rate was 99.990%. The average logarithmic inactivation of PRRSV GDr180 was 3.00 and the killing rate was 99.899% after 5 and 10 min of disinfectant solution action; the average logarithmic inactivation of PRVB was 1.15 and the killing rate was 92.921%; the average logarithmic inactivation of PCV2 P58 was 1.00 and the killing rate was 90.00%.

The above experimental data were extracted from "Jiangsu Agricultural Science", Vol. 49, No. 21, 2021, "The killing effect of hypochlorite disinfectant on swine pathogens".

The experiment proved that hypochlorous acid disinfectant has rapid and efficient killing effect on common pathogens in pig farms under the recommended concentration, and also has good effect on viruses such as PEDV and PPV, which can be used for daily disinfection in pig farms.

Besides, hypochlorous acid also plays an immediate role in deodorisation, water reuse, disinfection of vehicles and personnel, sterile drinking water for livestock and poultry, and elimination of facilities and tools in animal husbandry. The use of hypochlorite solution for fogging, soaking, spraying and other operations on the environment of pig pens, facilities, drinking water lines, waste, etc. can effectively inactivate common pathogens and bacteria in pig farms.