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supplement. They were divided into three identical groups : a) Treated with vaginal sponges (FGA and PMSG), b) Treated with subcutaneous implants (Norgestomet and PMSG) and c) A control group. The ewes were treated in July 1979, March and October 1980. The mating period for the control group was 35 days. There was significant differences between synchronization methods and seasons on fertility (83.7, 92.2, 84.9, 92.1, 78.5 and 88.0) with treatments a, b and c and in July, March and October, respectively. Also significant effects were found for the synchronization methods and seasons of the year on prolificacy (166, 150, 148, 169, 149 and 147) with treatments a, b and c and in July, March and October, respectively. No significant differences were encountered in oestrus occurrence for the synchronization methods or seasons of the year (100. 100, 98.2, 98.3, 99.4 and 100 for a, b, c and in July, March and October, respectively). Production of alive born lambs per ewe for two years was : 4.15, 4.16 and 3.78 for treatments a, b and c, respectively. The results of this study indicate the possibility of employing this system in Pelibuey ewes without oestrus synchronization.

The effect of oestrus synchronization and mating season on the productivity of Pelibuey ewes