Multitrait indices to predict worm length and number in sheep with natural, mixed predominantly Teladorsagia circumcincta infection.
Multitrait indices to predict worm length and number in sheep with natural, mixed predominantly Teladorsagia circumcincta infection.
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DOI：
10.1017/s0031182014001905
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发表时间：
2015-05
期刊：
影响因子：
2.4
通讯作者：
Stear MJ
中科院分区：
文献类型：
--
作者：
Mair C;Matthews L;De Cisneros JP;Stefan T;Stear MJ
准确鉴定对胃肠道线虫感染的抗性需要鉴定具有低和高感染强度的动物的能力。线虫的致病作用取决于蠕虫的长度和数量，这两者都不能在活体动物中测量。迫切需要预测这些数量的指数。每月粪便鸡蛋计数，体重，伊加浓度和胃蛋白酶原浓度测定苏格兰黑脸羊自然感染的混合线虫，主要是Teladorsagia circumcincta。在500多只尸检羔羊上获得了蠕虫数量和平均蠕虫长度。我们推导出预测指数的蠕虫长度和数量使用线性组合的性状测量活的动物。预测值与实测值的相关系数分别为0·55和0·51。这些指标可用于鉴别最抗病和最易感的羔羊。
Accurately identifying resistance to gastrointestinal nematode infections requires the ability to identify animals with low and high intensities of infection. The pathogenic effects of nematodes depend upon both the length and number of worms, neither of which can be measured in live animals. Indices that predict these quantities are urgently needed. Monthly fecal egg counts, bodyweights, IgA concentrations and pepsinogen concentrations were measured on Scottish Blackface sheep naturally infected with a mixture of nematodes, predominantly Teladorsagia circumcincta. Worm number and average worm length were available on over 500 necropsied lambs. We derived predictive indices for worm length and number using linear combinations of traits measured in live animals. The correlations between the prediction values and the observed values were 0·55 for worm length and 0·51 for worm number. These indices can be used to identify the most resistance and susceptible lambs.