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Reproductive tracts from 66 prepuberal, 45 2000 IU had no effect on uterine growth. cycling and 59 gonadotrophin-treated prepu-Within untreated puberal females, ovarian beral gilts were examined and measured to weight was positively (P < 0.01) correlated determine the effect of puberty and gonado-with uterine horn weight, length and wall trophin treatment on utero-ovarian interrela-thickness, whereas within prepuberal females tionships. Occurrence of the flrst ovulation re-only uterine wall thickness was correlated sulted in sigrrificant (P < 0.05) increases in (P<0.01 )withovarianweight.Seven(4lVo) uterine weight and length but not in uterine of the 17 gilts induced to ovulate at 55 kg wall thickness. This change was observed after and slaughtered at 90 kg were cycling when both the first spontaneous ovulation and ovu-slaughtered, while none of the control females lation induced by injecting 1000 IU or 2000 were cyctng. Effects of the gonadotrophin IU of pregnant mare's serum (PMS) fol-treatment on tract development in prepuberal lowed 48 hours later by an injection of 500 gilts were not apparent after the first spon-