Abstract
Sixty one (61) donor animals were inoculated with 500 I.U./100 kg body-weight of Pregnant Mare Serum Gonadotropin (PMSG) on days 9–14 of their oestrous cycle and given 25 mg PGF 2α 48 hrs. later. The superovulatory response to the PMSG injection on different days were evaluated based on the number of corpora lutea (CL) present in both ovaries at the time of surgical ova collection 5 days after standing heat. The average number of CL's was 11,1. The highest number of CL's was observed when PMSG was injected on day 11 (12,5 ± 5,5) and the lowest following day 14 treatment (4,5 ± 3,2). No statistical difference was found between days 9–10–11, 12 and 13. The results suggest that a certain “day of injection variation” may exist and contribute to the umpredictability of PMSG treatments.
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