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100 mg of progesterone) between 45 and 120 days of age or at weaning (200 days of age) on future reproductive performance. Trials were conducted at five ranches in Kansas and one in Nebraska. At each location, heifers were allotted to three treatments: no implant (Control), one implant at 45 to 120 days of age (EarlyIMP), or one implant at 2 0 0 days of age (WeanIMP). No differences were detected among treatments for first service conception rate (55%), overall pregnanc y rate (85%), or calving rate (80%). In addition, no differences were observed among treatments for pelvic area, reproductiv e tract score, or calving difficulty or for birth or weani ng weights of their calves. We conclude that implanting replacement heifers with Compone nt E-C early in life or at weaning had no effec t on their subsequent reproductive performance.

Reproductive performance of replacement heifers implanted as young calves or at weaning