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A longitudinal study of the effect of Theileria orientalis Ikeda type infection on three New Zealand dairy farms naturally infected at pasture.
Veterinary Parasitology ( IF 2.0 ) Pub Date : 2019-11-12 , DOI: 10.1016/j.vetpar.2019.108977
K E Lawrence 1 , K Gedye 1 , W E Pomroy 1
Affiliation  

The aims of this study were to monitor the change in Theileria orientalis Ikeda type infection intensity, haematocrit, milk production and reproduction on three New Zealand spring calving dairy herds, over the 2014-2015 milking season. Three spring calving dairy farms, A, B and C, from high risk (endemically stable), low risk (endemically unstable), and zero risk (disease-free) tick areas respectively were followed through the 2014-2015 milking season. On Farms, A and B, 100 cows were randomly selected at the first visit, and the same cows blood sampled every month thereafter, whilst on Farm C, the whole herd was blood sampled bimonthly (140 cows). Blood samples were tested for haematocrit, by centrifugation, and Ikeda infection intensity, using qPCR. Animals that were Ikeda type PCR positive at the first sampling were described as prevalence cases and cows that were negative at the first sampling and became PCR positive during the sampling period were described as incidence cases. Production and reproduction data were accessed through LIC MINDA® and milk production data was standardised to energy corrected milk (ECM). In addition, the effect of buparvaquone (BPQ) treatment on milk production was estimated on Farm B. The prevalence of infection at the first sampling was 100 % on Farm A, 57 % on Farm B and 26 % on Farm C. The incidence risk of infection over the sampling period on Farms B and C was 25 % and 2 % and the incident rate was 0.026 and 0.002 cases per cow-month respectively. The average infection intensity for prevalence cases on all farms was low throughout the milking season, <7000 Ikeda organisms/μL however, cases of anaemia still occurred. There was no direct effect of infection intensity on milk production or from being a prevalence case compared to an uninfected cow on milk production, across all farms. However, on Farm B there was a loss of 266 kg (95 % CI 82 ̶ 450) ECM (∼20 kg milk solids) for incidence cases and a loss of 458 kg (95 % CI 211 ̶ 710) of ECM for buparvaquone treated cows, compared to uninfected cows. No significant effect of Ikeda infection on reproduction could be shown for Farms B and C, reproductive data for Farm A was not available. The effect of T. orientalis Ikeda type infection on production and reproduction appears to be minimal once animals have passed through the acute phase of infection and reached the chronic, asymptomatic carrier phase of infection.

中文翻译:

对东方泰勒虫池田型感染对牧场自然感染的三个新西兰奶牛场的影响进行的纵向研究。

这项研究的目的是监测2014-2015年挤奶季节三个新西兰春季产犊奶牛群体中东方泰勒菌池田型感染强度,血细胞比容,产奶量和繁殖量的变化。在2014-2015挤奶季节,分别跟踪了三个高风险(地方性稳定),低风险(地方性不稳定)和零风险(无病)tick牛场的A,B和C农场。在农场A和B上,第一次访问时随机选择了100头母牛,此后每个月都要抽取同一头母牛的血样,而在农场C上,则每两个月要对整个牛群进行一次血液采样(140头母牛)。使用qPCR,通过离心测试血样的血细胞比容和池田感染强度。第一次采样时池田型PCR呈阳性的动物被描述为患病病例,第一次采样时呈阴性并在采样期间变为PCR阳性的牛被描述为发病病例。可通过LICMINDA®访问生产和繁殖数据,并将牛奶生产数据标准化为能量校正牛奶(ECM)。此外,在农场B上估计了丁苯喹酮(BPQ)处理对牛奶产量的影响。第一次采样时,农场A上的感染率为100%,农场B上为57%,农场C上为26%。发生风险在采样期间,B场和C场的感染率分别为25%和2%,发生率分别为每牛月0.026和0.002例。在整个挤奶季节,所有农场的感染率平均水平都很低,< 7000池田生物/μL,但仍然发生贫血病例。在所有农场中,感染强度对产奶量没有直接影响,与未感染牛相比,感染率对牛奶生产量没有直接影响。但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。贫血的情况仍然发生。在所有农场中,感染强度对产奶量没有直接影响,与未感染牛相比,感染率对牛奶生产量没有直接影响。但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。贫血的情况仍然发生。在所有农场中,感染强度对产奶量没有直接影响,与未感染牛相比,感染率对牛奶生产量没有直接影响。但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。在所有农场中,感染强度对产奶量没有直接影响,与未感染牛相比,感染率对产奶量没有直接影响。但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。在所有农场中,感染强度对产奶量没有直接影响,与未感染牛相比,感染率对牛奶生产量没有直接影响。但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。所有农场 但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。所有农场 但是,在农场B中,发病病例损失了266千克(95%CI 82̶450)ECM(约20千克乳固体),而丁丙酸喹啉治疗的ECM损失了458公斤(95%CI 211̶710)。牛,与未感染的牛相比。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。农场B和C没有显示出池田感染对繁殖的显着影响,没有农场A的生殖数据。一旦动物通过了感染的急性期并达到了感染的慢性无症状携带期,东方锥虫池田型感染对生产和繁殖的影响似乎很小。
更新日期:2019-11-01
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