One-generation reproductive toxicity study of dietary 17beta-estradiol (E2; CAS No. 50-28-2) in CD-1((R)) (Swiss) mice
Tyl, R. W., Myers, C. B., Marr, M. C., Castillo, N. P., Veselica, M. M., Joiner, R. L., ... Hentges, S. G. (2008). One-generation reproductive toxicity study of dietary 17beta-estradiol (E2; CAS No. 50-28-2) in CD-1((R)) (Swiss) mice. Reproductive Toxicology, 25(2), 144–160.
There is no information on reproductive/developmental effects in mice from dietary estrogen. Therefore, 10 adult CD-1((R)) mice/sex/group were administered dietary 17beta-estradiol (E2) at 0, 0.005, 0.05, 0.5, 2.5, 5, 10, and 50ppm for 2-week prebreed, mating, gestation, lactation. F1 weanlings (3/sex/litter) were necropsied and 2/sex/litter were retained, with exposure, until vaginal patency (VP) or preputial separation (PPS) and then necropsied. Results included complete infertility at 2.5-50ppm with normal mating indices. At 0.5ppm (and above), F0 adult female uterus plus cervix plus vagina weights (UCVW) were increased. At 0.5ppm: prolonged gestational length; increased F1 stillbirth index; reduced live birth index and litter size; decreased testes and epididymides weights at weaning; unaffected AGD on pnd 0 and 21; delayed PPS; increased undescended testes; unaffected prostate weight; accelerated VP; enlarged vaginas; fluid-filled uteri. At 0.05ppm: no F0 reproductive effects, increased F1 weanling UCVW; delayed PPS. The NOEL was 0.005ppm ( approximately 1mug/kg/day)