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In order to induce and synchronize oestrus in ewes, the use of subcutaneous melatonin implants is one of the easiest hormonal methods to be implementen at farm level. All rams have to be removed from the breeding flock prior with 2-3 weeks before the melatonin implants insertion, and implants could be used on lactating or dry ewes (day of insertion is day 0). Rams should be joined to the ewes starting day 28-31. This method leads to a better oestrus onset at flock level, a more synchronized reproduction and lambing timing, and also to an increase in the litter size. The costs are low, between 3 to 4 EUR per implant, and can be used in extensive production systems.