The objective of this study was to evaluate the genetic parameters of two generations of zebrafish breeding program. The base population was formed by crossing individuals of six commercial stocks of zebrafish, resulting in a nucleus with 60 families. Two generations were evaluated, with a total of 780 and 781 individuals for the first and second generation, respectively. The selection was made based on the mean genetic value of each family, followed by mass selection of the breeders. Mathematical models that considered the fixed (age, density in the larval stage, sex, and generation) and random (animal additive genetics, common to full-sibs, and residual) effects were evaluated using BLUPF90 program family. Weight and total length were used as response variables. Total length was the best selection criterion because it had a higher heritability (0.30) than weight (0.22). There was a high common to full-sib effect, especially in the first generation of animals. For second-generation data, the heritability was 0.26 for total length, as well as a lower common to full-sib effect for length. The best model obtained for this evaluation was considering all effects, being age and density as first and second polynomial, respectively. The genetic and phenotypic correlations for weight and length were 0.87 and 0.75, respectively. These results indicate that genetic breeding using total length as the selection criterion may produce a larger and heavier zebrafish strain.

中文翻译：

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斑马鱼育种程序：生长性状的遗传参数估计。

这项研究的目的是评估两代斑马鱼育种程序的遗传参数。通过将六种斑马鱼商业种群的个体杂交形成基本种群，从而形成一个有60个家庭的核。对第二代进行了评估，第一代和第二代分别有780和781个人。根据每个家族的平均遗传价值进行选择，然后进行育种家的大规模选择。使用BLUPF90程序系列评估了考虑固定（年龄，幼虫阶段的密度，性别和世代）和随机（动物相加遗传，全同胞常见和残留）影响的数学模型。重量和总长度用作响应变量。总长度是最佳选择标准，因为它的遗传力（0.30）比重量（0.22）高。全同胞效应具有很高的共同性，尤其是在第一代动物中。对于第二代数据，总长度的遗传力为0.26，而全长的同胞效应则较低。为进行此评估而获得的最佳模型是考虑所有影响，分别是年龄和密度作为第一多项式和第二多项式。体重和长度的遗传和表型相关性分别为0.87和0.75。这些结果表明，使用总长度作为选择标准的遗传育种可能会产生更大和更重的斑马鱼品系。总长度的遗传力为0.26，而全长的同胞效应较低。为进行此评估而获得的最佳模型是考虑所有影响，分别是年龄和密度作为第一多项式和第二多项式。体重和长度的遗传和表型相关性分别为0.87和0.75。这些结果表明，使用总长度作为选择标准的遗传育种可能会产生更大和更重的斑马鱼品系。总长度的遗传力为0.26，而全长的同胞效应较低。为进行此评估而获得的最佳模型是考虑所有影响，分别是年龄和密度作为第一多项式和第二多项式。体重和长度的遗传和表型相关性分别为0.87和0.75。这些结果表明，使用总长度作为选择标准的遗传育种可能会产生更大和更重的斑马鱼品系。