Latitude and seasons influence the prevalence of Theileria orientalis and affect the hematology of non-grazed dairy cows in Korea
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This pilot study aimed to investigate the effects of regional and seasonal variations onthe prevalence of Theileria orientalis and the hematological profile of non-grazed dairycows in Korea. A total of 365 clinically healthy lactating Holstein Friesian cows from 26dairy farms in 7 provinces that were categorized into northern, central, and southern regions were sampled during the warm period from July to August and the cold periodfrom October to December. The detection of T. orientalis major piroplasm surface proteingene and the hematology non-grazed dairy cows were analyzed using peripheral bloodsamples. The T. orientalis prevalence was 20.0% (73/365). The prevalence in the southern region was 35.9%, which was significantly higher than that in the central (21.6%)and northern (12.9%) regions (P<0.05). The prevalence during warm period was higher(43.0%) than that during the cold season (13.5%). The infected cows showed significantly lower erythrocyte counts in the southern region (5.8±0.6 M/µl) and during thewarm period (5.8±0.7 M/µl) compared with those in the central and northern regionsand during the cold season, which affected the extended RBC parameters, includinghematocrit and hemoglobin concentrations. Our findings revealed the prevalence of T. orientalis in Korea, highlighting its high occurrence during warm periods and in certaingeographical regions. Climatic factors could contribute to the health and productivity ofcattle, as evidenced by the prevalence of T. orientalis and its negative impact on animals.
Abstract
This pilot study aimed to investigate the effects of regional and seasonal variations onthe prevalence of Theileria orientalis and the hematological profile of non-grazed dairycows in Korea. A total of 365 clinically healthy lactating Holstein Friesian cows from 26dairy farms in 7 provinces that were categorized into northern, central, and southern regions were sampled during the warm period from July to August and the cold periodfrom October to December. The detection of T. orientalis major piroplasm surface proteingene and the hematology non-grazed dairy cows were analyzed using peripheral bloodsamples. The T. orientalis prevalence was 20.0% (73/365). The prevalence in the southern region was 35.9%, which was significantly higher than that in the central (21.6%)and northern (12.9%) regions (P<0.05). The prevalence during warm period was higher(43.0%) than that during the cold season (13.5%). The infected cows showed significantly lower erythrocyte counts in the southern region (5.8±0.6 M/µl) and during thewarm period (5.8±0.7 M/µl) compared with those in the central and northern regionsand during the cold season, which affected the extended RBC parameters, includinghematocrit and hemoglobin concentrations. Our findings revealed the prevalence of T. orientalis in Korea, highlighting its high occurrence during warm periods and in certaingeographical regions. Climatic factors could contribute to the health and productivity ofcattle, as evidenced by the prevalence of T. orientalis and its negative impact on animals.
참고문헌 (35)
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