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Preliminary results about genetic parameters associated with weight gain in mice

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Authors: N. Ibáñez, A. Moreno, C. Salgado, P. Piqueras, B. Nieto, J.P. Gutiérrez
Issue: 102-2 (180-184)
Topic: Animal Production
Keywords: Canalisation, Environmental variability, Mice, Weight, Weight gain

The aim of this study was to estimate the genetic parameters associated to the environmental variability of the following traits in mice: weight at 21 days, weight at 42 days and weight gain between 21 and 42 days. Data were obtained from a experimental mice population selected during 17 generation for increase of adult weight and included 4896 males. Data were analysed using Bayesian procedures after fitting two different models: that of homogeneous variances and that of heterogeneous variances. Genetic correlation between the analysed traits and their variability was always negative ranking from -0.22 to -0.61. Results allow concluding that there is a possible genetic component affecting the analysed traits thus making possible its reduction by selection.

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