Effect of cyclophosphamide (CP) or radiation on days 10.5 and 11.5 after mating on breeding efficiency of 129 and L1 mice.

Abbreviation: ND, no data.aValues given as absolute number and percentage of total vaginal plug-positive females.bThe number of male offspring per group ranged from 19 to 51.cData from 129S5 and 129S1/SvImJ mice were pooled.dSignificantly different between treated and control mice (PeSignificantly different between treated and control mice (Pt test).fHistorical data from previous study [5] were used for comparison.