For most late term mares, lying completely on their side is unique to the birth process. In order to gather and focus the strength for a contraction, the mare lies down in the totally lateral position. Research has established that a contraction lasts a minimum of 7 seconds. The transmitter registers this position and the alarm is activated after 7.6 seconds. 1)  The mare lies down in the totally lateral position to rest. The alarm will not activate although the receiver does indicate that the mare is on her side and the transmitter is sending a signal. If the mare is still lying in this position after three minutes the Birth Alarm registers that the mare is resting and the system is neutralized. Suppose that after half an hour the mare gets up and then once again lies down on her side. The Birth Alarm again registers the position for a period of three minutes. The period of three minutes is not arbitrary. Research has shown that a mare’s contraction never lasts longer than 2.5 minutes. The Birth Alarm system is based on a period of 3 minutes - a safety margin of 0.5 minutes. Some mares may lie completely over on their side in order to rest. There are two situations which may arise. MODES OF OPERATION Mode 4a Mode 4b 2)  Before delivery, the mare lies down flat on her side. The alarm does not go off after 7.6 seconds as the system is set on 4b but the receiver does register that the mare is lying in this position. After the contraction the mare will prepare herself for the following contraction. She does this by coming out of a the totally lateral position. If the Birth Alarm registers this movement within a period of 3 minutes after the mare has laid down, the alarm activates. 00:08 03:00 01:47

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