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Boars must be 10 months old or more, in order to assure enough production of pheromones and a good libido. They should be not many heavy to avoid injuries in sows. It is advisable to vasectomize them. Also it is suitable to have several boars because some sows show preferences to a particular boar. In the case of weaning sows in big pens, it is necessary to use 2 or 3 boars at the same time, and they must have been bred together in order to avoiding troubles between males. Technician who makes heat detection must know the physiology of the process to allow the correct development of the stimulus, giving to the boar enough time to provoke a clear response in the sow. Patience and calmness are necessary, especially with gilts that show heat with more difficulties. Ovulation takes place during the last third of the heat. The correct heat detection is very important because it helps to calculate more accurately the ovulation time. This fact will allow to increasing the probability of performing the inseminations before ovulation and therefore increasing its success.
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