Progress 07/01/02 to 01/31/07
Outputs
No significant differences were observed between treated and control quarters during this experiment for mean somatic cell count, average somatic cell count, and percent of cows infected with Staphylococcus aureus mastitis. There was a trend toward higher infection rates in experimental quarters during the experiment. This trend may have been due to the fact that super-infected quarters, those with more than one bacteria, were less able to cope with infection leading to higher rates of mastitis.
Impacts
This study provides no support for the use of Staphylococcus xylosus to treat Staphylococcus aureus-infected quarters. Experimental cows had higher somatic cell counts and were more likely to be positive for bacteria than were control quarters.
Publications
- No publications reported this period
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Progress 07/01/04 to 02/10/05
Outputs
Nine experimental quarters and 10 control quarters were used in this study. Experimental Staphylococcus aureus-infected quarters were infused with Staphylococcus xylosus while control quarters were not. Milk cultures and direct microscopic somatic cell counting was performed on days 0,7,14, and 30 of the study. Results were as follows: Experimental quarters positive for Staphylococcus aureus on days 0,7,14, and 30: 100,90,90,90. Contol quarters positive for Staphylococcus aureus on days 0,7,14,and 30: 100, 90, 70, 80. Average SCC (millions) in experimental quarters on days 0,7,14,and 30: 6.7, 7.8, 5.5, 3.2. Average SCC (millions) in control quarters on days 0,7,14,and 30: 8.1,11.9,7.8,13.6. Mean SCC (millions) in experimental quarters on days 0,7,14, and 30: 6.0,5.0,2.5,3.5. Mean SCC (millions) in control quarters on days 0,7,14,and 30: 6.5,14,9,12.5.
Impacts
The data has not yet been analyzed statistically to determine if there are significant differences. Once statistical analysis is done, an impact statement will be available.
Publications
- No publications reported this period
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Progress 12/31/03 to 06/07/04
Outputs
The experimental cows in this study have been treated and their response to the treatment has been measured. Two control cows have completed the study protocol as well. Eight control cows still remain to be identified and have their milk collected. Once eight more naturally infected S. aureus mastitis cows are identified, milk samples will be collected on days 0, 7,14, and 28 from these cows. The milk collected from these eight cows will be cultured and the somatic cell count will be determined in each sample.
Impacts
If this treatment is successful, it will allow for a non-antibiotic alternative to treat bovine Staphylococcus aureus infections.
Publications
- No publications reported this period
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