Genetic parameters for tick counts across months for different tick species and anatomical locations in South African Nguni cattle.
Genetic parameters for tick counts across months for different tick species and anatomical locations in South African Nguni cattle.
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DOI：
10.1007/s11250-017-1336-2
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发表时间：
2017-08
影响因子：
1.7
通讯作者：
Dzama K
中科院分区：
文献类型：
--
作者：
Mapholi NO;Maiwashe A;Matika O;Riggio V;Banga C;MacNeil MD;Muchenje V;Nephawe K;Dzama K
这项研究的目的是描述南非恩古尼牛不同蜱虫种类和解剖位置的遗传参数。在2年期间，每月对来自南非不同省份的4个畜群的586头受到自然侵扰的恩古尼牛进行蜱虫计数。记录了6种蜱（蛇形头蜱、蛇形头蜱、脱色头蜱和小头蜱、尾尾头蜱、蛇形头蜱和边缘玻眼蜱）在动物身上8个解剖位置的数量，并按种类和解剖位置进行了统计。使用混合线性模型，拟合单变量和双变量遗传模型，每月估计遗传力估计，表型和遗传相关性。固定效应考虑的协变量包括地点、性别、年份和年龄。热月蜱数较高，以希伯来蠓为优势蜱种。蜱虫数量的遗传率估计因月份和性状而异，范围从0到0.89。遗传相关多为正相关，由低到高，有部分负相关，标准误差较高。表型相关性为低至中等。总的来说，在全身计数和解剖位置计数之间观察到高度的遗传相关性，这表明可能没有必要进行全身计数。腹部和会阴的计数似乎是最适合全身计数的替代特征。这些发现为制定实际实施遗传选择的策略提供了有用的信息，作为传统蜱虫控制措施的补充。本文的在线版本（doi:10.1007/s11250-017-1336-2）包含补充材料，仅供授权用户使用。
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. The online version of this article (doi:10.1007/s11250-017-1336-2) contains supplementary material, which is available to authorized users.
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影响因子：
3.7
作者：
Bishop SC;Woolliams JA
通讯作者：
Woolliams JA
影响因子：
--
作者：
Corbet, NJ;Shepherd, RK;Bosman, DJ
通讯作者：
Bosman, DJ
影响因子：
3.6
作者：
Muchenje, V.;Dzama, K.;Strydom, P. E.
通讯作者：
Strydom, P. E.
影响因子：
3.3
作者：
Cardoso, F. F.;Gomes, C. C. G.;Aguilar, I.
通讯作者：
Aguilar, I.
影响因子：
3.5
作者：
MADALENA, FE;TEODORO, RL;BARBOSA, RT
通讯作者：
BARBOSA, RT