Genetic parameters of animal traits associated with coccidian and nematode parasite load and growth in Scottish Blackface sheep.
Genetic parameters of animal traits associated with coccidian and nematode parasite load and growth in Scottish Blackface sheep.
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与苏格兰黑脸羊球虫和线虫寄生虫负载和生长相关的动物性状的遗传参数。
DOI：
10.1016/j.animal.2021.100185
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Pacheco A
中科院分区：
文献类型：
--
作者：
Pacheco A
胃肠道寄生虫病是放牧反刍动物的一个全球性问题，可以通过饲养动物以提高对疾病的抵抗力来以可持续的方式解决。本研究估计与自然线虫和球虫感染苏格兰黑脸羊常见和新的疾病表型的遗传参数，以支持未来的遗传改良策略，寄生虫控制。在3月龄羔羊上收集来自不同种类的圆线虫寄生虫的粪便卵计数（FEC）和来自球虫寄生虫的粪便卵囊计数（FOC）的数据，以及臀区粘性（DAG）和活重（LWT）的粪便污染评分。获得了圆线虫（FECS）、线虫（FECN）和球虫（FOC）的粪便计数数据。包括2011年至2017年期间采样的3731只羔羊的数据。在分析前，对粪便虫卵计数和DAG记录进行对数转换。使用线性混合模型分析数据。采样时的平均年龄为92天，平均LWT为24.5 kg。69%的羔羊粪便污染不明显，球虫是最常见的寄生虫（99.5%），而圆线虫和线虫的患病率分别为95.4%和72.7%。FECS、FECN、FOC、DAG和LWT的遗传度估计值（± SE）分别为0.16 ± 0.03、0.17 ± 0.03、0.09 ± 0.03、0.09 ± 0.03和0.33 ± 0.04，粪圆线虫虫卵数与FECN有较强的正遗传相关（0.74 ± 0.09），与FOC（0.39 ± 0.15）呈中度正相关，而DAG与LWT（-0.33 ± 0.15）呈负遗传相关。3月龄FECS、FECN和FOC之间的显著正遗传相关表明，绵羊对这三种寄生虫的抗性共选择是可行的。对寄生虫感染的抗性增加的选择预期不会对活BW产生不利影响，因为在LWT和FEC之间没有发现显著的拮抗遗传相关性。DAG和LWT之间存在显著的拮抗表型和遗传关系，分别为-0.19 ± 0.02和-0.33 ± 0.15，表明羔羊疾病表现的表达可能是寄生虫负荷对生产力影响的更有意义的指标。
Gastrointestinal parasitism is a global problem for grazing ruminants which can be addressed in a sustainable way through breeding animals to be more resistant to disease. This study estimates the genetic parameters of common and new disease phenotypes associated with natural nematode and coccidian infection in Scottish Blackface sheep to underpin future genetic improvement strategies for parasite control. Data on faecal egg counts (FEC) from different species of strongyle parasites and faecal oocyst counts (FOC) from coccidian parasites were collected on 3-month-old lambs together with a faecal soiling score in the breech area dagginess (DAG) and live weight (LWT). Faecal count data were obtained forStrongyles(FECS),Nematodirus(FECN) andCoccidia(FOC). Data from 3 731 lambs sampled between 2011 and 2017 were included. Faecal egg counts and DAG records were log-transformed prior to analysis. Data were analysed using linear mixed models. Average age at sampling was 92 days with a mean LWT of 24.5 kg. Faecal soiling was not evident in 69% of lambs.Coccidiawere the most prevalent parasite (99.5%), while Strongyles andNematodirushad a prevalence of 95.4% and 72.7%, respectively. Heritability estimates (± SE) were 0.16 ± 0.03, 0.17 ± 0.03, 0.09 ± 0.03, 0.09 ± 0.03 and 0.33 ± 0.04 for FECS, FECN, FOC, DAG and LWT, respectively.Strongylesfaecal egg count had a strong and positive genetic correlation with FECN(0.74 ± 0.09) and a moderate positive correlation with FOC (0.39 ± 0.15) while DAG was negatively genetically correlated with LWT (− 0.33 ± 0.15). The significant positive genetic correlations between FECS, FECNand FOC at 3 months of age show that co-selection of sheep for resistance to these different parasites is feasible. Selection for increased resistance to parasite infection is not expected to adversely affect live BW, as no significant antagonistic genetic correlations were found between LWT and FEC. There were significant antagonistic phenotypic and genetic relationships between DAG and LWT being − 0.19 ± 0.02 and − 0.33 ± 0.15, respectively, indicating that the expression of the manifestation of disease in lambs may be a more meaningful indicator of the impact of parasite burden on productivity.
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对麦克马斯特蠕虫卵计数技术和仪器的一些修改。
DOI：
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发表时间：
1948
期刊：
影响因子：
--
作者：
H. V. Whitlock
通讯作者：
H. V. Whitlock
影响因子：
2.4
作者：
Craig, B. H.;Tempest, L. J.;Pemberton, J. M.
通讯作者：
Pemberton, J. M.
抗胃肠道线虫育种——低投入/产出小型反刍动物生产系统的潜力
影响因子：
2.6
作者：
P. I. Zvinorova;P. I. Zvinorova;T. Halimani;F. Muchadeyi;O. Matika;V. Riggio;K. Dzama
通讯作者：
K. Dzama
影响因子：
1.8
作者：
Gauly, M;Reeg, J;Erhardt, G
通讯作者：
Erhardt, G
美利奴羊毛育种目标中的蠕虫抗性——抗性和生产性状之间遗传相关性的影响。
DOI：
--
发表时间：
1998
期刊：
--
影响因子：
--
作者：
S. Eady
通讯作者：
S. Eady