• J. Nagai

      Articles written in Journal of Genetics

    • Genetic effects of age on performance in random-bred mice

      J. Nagai C. G. Hickman

      More Details Abstract Fulltext PDF

      Two lines of mice (A and Y) differing in age at mating were maintained with as similar ancestry as possible for nine and 13 generations, and were used for diallel matings to contemporaneously produce various genotypes of offspring (A, Y, F1, F2, and backcross). Body weights of offspring at birth, and at 12, 20 and 42 days of age were recorded, and data on actual and logarithmic scales were analysed Regression of the mean body weight for the respective genotype on the coded A-line gene effects was significant (P < 0. 05) only in 20-day weight on both actual and logarithmic scales. When the mean body weight was expressed in standard deviation unit, regression was significant (P < 0. 05) for 20-day and 42-day weight on actual scale. It was concluded that birth weight and 12-day weight were not genetically affected by accumulated parent age effects. The results inconclusive with respect to 20-day and 42-day weight were discussed.

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