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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Heritabilities, phenotypic correlations, genetic correlations and repeatability of production variables in Argentine llamas
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Heritabilities, phenotypic correlations, genetic correlations and repeatability of production variables in Argentine llamas

机译：阿根廷美洲驼的遗传力，表型相关性，遗传相关性和生产变量的可重复性

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The objectives of this work were to determine heritabilities, phenotypic, and genetic correlations between production traits and to report means and standard deviations. The data comprised 2820 records, from 450 founding females and 45 founding males involving 816 measured animals. The llamas came from three different localities and the variables studied were: fleece weight (annual shearing), fleece strip weight (fleece weight predictor), staple length, mean fibre diameter, fibre diameter coefficient of variation, total medulation grade and thoracic circumference as an animal size measure. Genetic (co)variances, heritabilities and genetic and phenotypic correlations were obtained through a multivariate animal model with repeatabilities, using VCE4 (Variance Components Estimation) software. Fixed effects of the mixed model included: year of production, year of sampling (repeated), animal age at sampling, flock, coat color and type of fleece. The heritabilities and correlations obtained were generally lower than other estimates made out of the altiplano areas, but in concordance with values from the altiplano areas. It was concluded that important selection responses can be expected if these traits are used as selection criteria. The fact that the fleece strip weight can be used to predict fleece weight is an important finding, given the high genetic and phenotypic correlations between these two variables. The correlations between fleece weight, mean fibre diameter and body size were unfavorable.
机译：这项工作的目的是确定生产性状之间的遗传力，表型和遗传相关性，并报告均值和标准差。数据包括2820条记录，来自450例成年雌性和45例成年雄性，涉及816只被测动物。美洲驼来自三个不同的地方，研究的变量是：羊毛重量（年度剪切），羊毛条重量（羊毛重量预测值），订书钉长度，平均纤维直径，纤维直径变异系数，总调节度和胸围动物大小的度量。使用VCE4（方差成分估计）软件通过具有重复性的多变量动物模型获得遗传（共）方差，遗传力以及遗传和表型相关性。混合模型的固定影响包括：生产年份，采样年份（重复），采样时的动物年龄，羊群，毛色和羊毛类型。获得的遗传力和相关性通常低于对高原地区做出的其他估计，但与高原地区的值一致。结论是，如果将这些性状用作选择标准，则可以期待重要的选择反应。考虑到这两个变量之间的高度遗传和表型相关性，羊毛条重量可以用来预测羊毛重量这一事实是一个重要发现。羊毛重量，平均纤维直径和体型之间的相关性是不利的。

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