The importance of genetic x environment interaction in 548-days weight in beef cattle was evaluated by means of some 440 records obtained from the database of the Romosinuano Program in Venezuela. Least squares analysis included fixed effects of herd (H), sex (S), year (Y) and month (M) of calving, age of cow (A), sire (S) and interaction S x H. An Animal Model analysis included fixed effects of H, S, Y, M, A and animal random genetic effect, while another Animal Model identified and included sire present in different herds as different ones, in order to obtain their estimates of genetic within each herd. Results indicate that genetic by environment interaction was highly significant (P < 0,01) and that genetic merit of sires ranks different within herds which imply the necessity to be careful with the selection of sires to be used in different environments from the ones that were used to produce records for their evaluations.
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机译：通过从委内瑞拉Romosinuano计划数据库中获得的约440条记录，评估了肉牛在548天体重中遗传x环境相互作用的重要性。最小二乘分析包括产犊（H），性别（S），年份（Y）和月份（M），产犊年龄（A），父亲（S）和相互作用S x H的固定影响。动物模型分析包括H，S，Y，M，A的固定效应和动物随机遗传效应，而另一种动物模型则识别并把存在于不同畜群中的父亲作为不同的公牛，以便获得它们在每个畜群中的遗传估计。结果表明，通过环境相互作用的遗传具有高度显着性（P <0.01），并且公牛的遗传优劣在畜群中排名不同，这意味着需要谨慎选择在不同环境中使用的公母。用于产生评估记录。
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