S U M M A R YThe luteolytic effect of prostaglandin F 2a (PGF 2a ) during the confirmed luteal phase of the oestrous cycle was evaluated in ten Boran and ten Boran x Friesian cross-bred heifers. Following injection with 25 mg Lutalyse, animals were bled every 6 h for 96 h and plasma progesterone (P 4 ) determined by the ELISA technique. Borans had significantly (P < 0-05) smaller corpora lutea (1201 ±0-72 v. 17-03 ±2-10 mm) and responded faster to PGF 2a injection (65-57+1-40 v. 78-27 + 218 h) than the cross-bred heifers. However, there was no significant difference in either the initial P 4 values (6.24 + 0-98 v. 8-00 ± 1-71 ng/ml) or the rate of its decline following PGF 2a injection between the two breeds. Values declined sharply to basal levels (11 % of the initial pretreatment values) within 48 h in both breeds. All ten cross-breds and eight Borans showed standing oestrus within a week of treatment. However, oestrus was better synchronized (P < 005) in Borans than cross-breds. It was concluded that PGF 2a is effective for oestrus synchronization in both breeds, but oestrus occurred earlier and was more precise in Borans than in cross-breds.
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