A major issue with reproductive management programmes at this time of year is detection of heats among cows & heifers for AI where the number of animals available for heat detection has reduced after the first and second service periods. I have looked at both the use of Kemar (registered) v's heat seeker device (registered) . They are both devices which are put on the rear of the animal facing the animal's head. Client's experience that have used them is that they prefer the heat seeker device as the device is larger and stays in place and releases dye over a larger surface area making the signs of heat more evident. Kamar (registered) are approximately 50% of the cost of the heat seeker device.