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Abstract：
This pilot study aimed to investigate the effects of regional and seasonal variations on the prevalence of Theileria orientalis and the hematological profile of non-grazed dairy cows in Korea. A total of 365 clinically healthy lactating Holstein Friesian cows from 26 dairy 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 period from October to December. The detection of T. orientalis major piroplasm surface protein gene and the hematology non-grazed dairy cows were analyzed using peripheral blood samples. 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 the warm period (5.8 ± 0.7 M/µl) compared with those in the central and northern regions and during the cold season, which affected the extended RBC parameters, including hematocrit and hemoglobin concentrations. Our findings revealed the prevalence of T. orientalis in Korea, highlighting its high occurrence during warm periods and in certain geographical regions. Climatic factors could contribute to the health and productivity of cattle, as evidenced by the prevalence of T. orientalis and its negative impact on animals.
摘要：
这项初步研究旨在研究区域和季节变化对韩国东方Theileria的患病率和非放牧奶牛的血液学特征的影响。来自7个省的26个奶牛场的365头临床健康的泌乳荷斯坦·弗里斯奶牛，这些奶牛被归类为北方，中央,在7月至8月的温暖时期和10月至12月的寒冷时期对南部地区进行了采样。采用外周血样本对非放牧奶牛进行了侧柏表面蛋白基因的检测和血液学分析。侧柏患病率为20.0%(73/365)。南部地区的患病率为35.9%,显著高于中部地区(21.6%)和北部地区(12.9%)(P<0.05)。温暖时期的患病率（43.0％）高于寒冷季节的患病率（13.5％）。与中部和北部地区以及寒冷季节相比，南部地区（5.8±0.6M/μl）和温暖时期（5.8±0.7M/μl）的感染母牛的红细胞计数显着降低，这影响了扩展的RBC参数，包括血细胞比容和血红蛋白浓度.我们的发现揭示了韩国东方毛虫的患病率，突出了它在温暖时期和某些地理区域的高发生率。气候因素可能会影响牛的健康和生产力，东方毛虫的流行及其对动物的负面影响证明了这一点。
