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RESPONSES TO SELECTION FOR BODY WEIGHT IN DESCENDANTS OF X-IRRADIATED RATS
Daniel Gianola 1, A. B. Chapman 1, and J. J. Rutledge 1
1 University of Wisconsin, Madison 53706
The effectiveness of selection for high and low body weight at six weeks of age was studied in descendants of X-irradiated (R) and nonirradiated (C) inbred rats. There were two replicates of each of the direction of selection-irradiation treatments. In C lines, there were no consistent responses to selection, probably due to a low level of genetic variability. In R rats, selection was effective only for decreased body weight. The results of this experiment do not suggest the use of irradiation combined with selection as a means of enhancing responses to selection in animals.
Submitted on July 10, 1978Revised on November 20, 1978
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