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首页> 外文期刊>Tropical Animal Health and Production >Genetic parameters for tick counts across months for different tick species and anatomical locations in South African Nguni cattle
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Genetic parameters for tick counts across months for different tick species and anatomical locations in South African Nguni cattle

机译：不同蜱型不同蜱型物种和解剖地位的几个月的遗传参数

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The objective of the study was to characterise genetic parameters across months for different tick species and anatomical locations in South African Nguni cattle. Tick counts were conducted monthly, over a 2-year period, on 586 Nguni cattle under natural infestation, from four herds located in different provinces of South Africa. The counts were recorded for six species of ticks (Amblyomma hebraeum, Rhipicephalus evertsi evertsi, Rhipicephalus decoleratus and microplus (Boofilids), Rhipicephalus appendiculatus, Rhipicephalus simus and Hyalomma marginatum) attached on eight anatomical locations on the animals and were summed by species and anatomical location. Heritability estimates, phenotypic and genetic correlations were estimated on a monthly basis using mixed linear models, fitting univariate and bivariate sire models. Fixed effects considered were location, sex, year and age as a covariate. Tick counts were higher in the hot months, and A. hebraeum was the most dominant tick species. Heritability estimates for tick count varied by month and trait and ranged from 0 to 0.89. Genetic correlations were mostly positive, and low to high, with some negative correlations with high standard error. Phenotypic correlations were low to moderate. In general, high genetic correlations were observed between whole body count and the anatomical location counts, suggesting that it may not be necessary to conduct whole body counts. Counts from the belly and perineum appeared to be the most suitable surrogate traits for whole body count. These findings provide useful information for developing strategies for the practical implementation of genetic selection, as a supplement to the traditional tick control measures.
机译：该研究的目的是在南非NgUni牛的不同蜱型和解剖部门的几个月中表征遗传参数。蜱圈数于每月进行2年，在南非不同省份的四个牧群下的586名尼加牛下进行了2年。记录六种蜱虫（Amblyomma hebrabraeum，reflyhalus evertsi，rhingicephalus decoleratus和microplusi（boofilids），r hapicephalus simus和hyalomma marganatum）附着在动物的八个解剖学位置，并被物种和解剖位置求和。利用混合线性模型，拟合单变量和双变量尺码估计，估计可遗传性估算，表型和遗传相关性。定位的固定效果是当代的位置，性别，年龄和年龄作为协变量。炎热的月份蜱数较高，A. Hebraeum是最占主导地位的蜱虫。遗传性估算蜱数因月和特质而变化，范围为0到0.89。遗传相关性大多是阳性的，低到高，具有与高标准误差的一些负相关性。表型相关性低至中度。通常，在全身计数和解剖学位置之间观察到高遗传相关性，表明它可能没有必要进行全身计数。来自腹部和会阴的计数似乎是全身数量最适合的替代品。这些调查结果为发展遗传选择的实际实施策略提供了有用的信息，作为传统蜱控制措施的补充。

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