Smaller successive litters with fewer KEL-positive pups are born to wild-type females mated with KEL males. (A) Number of pups alive at birth, (B) number of pups alive at weaning, and (C) percentage of KEL-positive pups in first and third litters of wild-type females mated with KEL males. (D) Number of pups alive at birth, (E) number of pups alive at weaning, and (F) percentage of KEL-positive pups in first and third litters of control KEL females mated with wild-type males. (A-C) Data are a compilation of 40 total pregnancies; (D-F) data are a compilation of 16 total pregnancies. *P < .05.