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Sporulation of Eimeria maxima oocysts in litter with different moisture contents
L Waldenstedt1, K Elwinger, A Lundén
1Swedish University of Agricultural Sciences, Department of Animal Nutrition and Management, Funbo-Lövsta Research Center, Uppsala. Lotta.Waldenstedt@huv.slu.se
Abstract:
The aim of this study was to determine if the sporulation of Eimeria maxima oocysts was affected by the moisture content of the litter. Fresh feces were collected from chickens experimentally infected with E. maxima. The feces were mixed with dried wood shavings and different amounts of water to obtain final moisture contents of 16, 42, and 62% and a final oocyst concentration of 5,000 per g of mixture. The samples were kept at 23 C and 75% relative humidity and were thoroughly aerated every 12 h. Oocysts kept under ordinary laboratory sporulation conditions in 2% wt/vol aqueous potassium dichromate at 27 C were used as a standard for optimal sporulation. The proportion of sporulated oocysts was determined microscopically every 12 h. Sporulation of E. maxima was most efficient under the driest conditions studied (16% moisture content), and poorest in the samples with the highest moisture content (62%). Even though the differences may not have resulted from a direct effect of humidity on the oocysts, but more likely resulted from limited oxygen in the moister substrates, it is clear that sporulation is not favored by moist litter.
Insights
Litter moisture content significantly impacts Eimeria maxima oocyst sporulation. Optimal sporulation occurred at 16% moisture, while higher moisture levels (62%) inhibited the process, likely due to reduced oxygen availability.
Area of Science:
- Veterinary Parasitology
- Oocyst Sporulation Biology
- Poultry Health
Background:
- Eimeria maxima is a significant protozoan parasite affecting poultry.
- Oocyst sporulation is a critical stage in the Eimeria life cycle, influencing transmission.
- Litter conditions in poultry houses can vary widely, potentially affecting parasite development.
Purpose of the Study:
- To investigate the effect of varying litter moisture content on the sporulation efficiency of Eimeria maxima oocysts.
- To determine the optimal moisture level for Eimeria maxima sporulation under controlled conditions.
Main Methods:
- Feces from Eimeria maxima-infected chickens were mixed with wood shavings to achieve moisture levels of 16%, 42%, and 62%.
- Oocyst concentration was standardized to 5,000 per gram in all mixtures.
- Samples were incubated at 23°C and 75% relative humidity with aeration every 12 hours.
- Sporulation rates were assessed microscopically every 12 hours and compared to optimal laboratory conditions (27°C in 2% potassium dichromate).
Main Results:
- Eimeria maxima oocyst sporulation was most efficient at the lowest moisture content tested (16%).
- Sporulation efficiency decreased significantly with increasing moisture content, being poorest at 62% moisture.
- The reduced sporulation in moist litter may be linked to limited oxygen availability rather than direct humidity effects.
Conclusions:
- Moist litter conditions are unfavorable for Eimeria maxima oocyst sporulation.
- Managing litter moisture is crucial for controlling Eimeria transmission in poultry farms.
- Further research may clarify the precise mechanisms, such as oxygen limitation, affecting sporulation in different litter moisture environments.