Related Experiment Videos
[Microbial contamination of dust in minimum-morbidity housings for pig rearing]
Abstract:
The range of the microbial contamination of 1 g of dust in minimum-morbidity pig rearing houses is from 2.9 . 10(7) to 7.6 . 10(9) in the microbes growing on meat-peptone agar (MPA), from 4.6 . 10(7) to 4.6 . 10(8) in moulds growing on the Czapek-Dox agar, from 1.4 . 10(2) to 7.0 . 10(4) in the total number of microbes growing on End's agar, and from 3.1 . 10(2) to 5.7 . 10(3) in the typically lactose-positive microbes growing on End's agar. The numbers of microbes in 1 g of dust in the conventional pig houses are close to the numbers found in pig rearing houses with minimum morbidity. However, in the moulds on the Czapek-Dox agar, the range of the microbial contamination of dust in the minimum-morbidity pig houses was much higher. The highest level of the contamination of dust with microbes was found on all types of media from houses with continual operation. It was revealed by the control of the effectiveness of disinfection in the minimum-morbidity piglet rearing section, operated on the all-in all-out basis, that in a half of the cases studied the disinfection had low effectiveness. The total number of microbes per 1 sq. cm was lower than required on the basis of research published in literature, but the occurrence rate of positive smears with lactose-positive microbes after disinfection was higher in percentual expression.
Insights
Microbial contamination in pig dust is high, especially in continuously operated houses. Disinfection effectiveness in minimum-morbidity settings was often low, with higher lactose-positive microbe rates post-treatment.
Area of Science:
- Environmental microbiology
- Veterinary science
- Animal husbandry
Context:
- Assesses microbial contamination levels in pig rearing house dust.
- Compares contamination in minimum-morbidity vs. conventional pig houses.
- Evaluates disinfection efficacy in all-in/all-out piglet rearing systems.
Purpose:
- Quantify microbial load (total bacteria, molds, lactose-positive bacteria) in pig dust.
- Identify factors influencing microbial contamination, such as housing type and operation.
- Determine the effectiveness of disinfection protocols in minimizing microbial presence.
Summary:
- Dust in pig houses harbors significant microbial loads, with meat-peptone agar (MPA) showing 2.9 x 10^7 to 7.6 x 10^9 microbes/g.
- Moulds on Czapek-Dox agar were notably higher in minimum-morbidity houses compared to conventional ones.
- Continuously operated houses exhibited the highest contamination levels across all media; disinfection efficacy was low in 50% of minimum-morbidity cases.
Impact:
- Highlights potential health risks associated with high microbial dust loads in swine environments.
- Underscores the need for improved disinfection strategies in pig farming, particularly in all-in/all-out systems.
- Provides baseline data for assessing and managing microbial contamination in piggery dust for disease prevention.