J. Anim Sci.
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J. Anim Sci. 1970. 31:289-295.
© 1970 American Society of Animal Science
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Sex-Heterosis Interaction, Heterosis and Reciprocal Effects among Mice Selected for Body Weight1

J. M. White2, E. J. Eisen and J. E. Legates3

North Carolina State University, Raleigh

Abstract

All possible crosses and reciprocals were made among three lines of mice (H6, L6, C2). Two of the lines had been subjected to long term selection for increased (H6) and decreased (L6) body weight at 6 weeks. The C2 line was a randomly maintained control. Data were obtained on 258 litters totaling 1284 mice at 56 days primarily to study relationships between heterosis and sex for body weight and gain. Significant differences in heterosis, pureline, reciprocal and sex effects for weights at 12, 21, 42 and 56 days plus gains from 12 to 21 days, 21 to 42 days and 42 to 56 days were numerous. Sex-heterosis interactions were significant in five of 21 possible cases. In each of the five cases, the interaction was due to more heterosis in the heterogametic sex. For the three contrasts involving 42 to 56-day gain, the males showed more negative heterosis than the females. In the remaining 13 cases, males exhibited more heterosis than females, even though the differences were not significant statistically. Sex-reciprocal interactions were not generally important. Real effects were indicated only in the H6-L6 set. Sex-linked genes probably had little effect on growth in these mice.

Footnotes

1 Paper Number 2941 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, N. C. This research was supported by Public Health Service Grant GM11546. Computing services for this investigation were supported by Public Health Service Grant FR-00011.

2 Present address: Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg.

3 The authors acknowledge the technical assistance of Mrs. C. Cordrey, Mrs. B. J. Edwards and Mrs. M. Gurganus.






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