Estrus of animals and particularly sows is determined for planning of a preferred time period of insemination by a sensing system arranged to detect standing of the animal. Data from the sensing system is collected and analyzed using an algorithm and information that is displayed on an indicating system to provide an indication to a worker of the time period of estrus and ovulation and of a useful insemination time period and a preferred insemination time period of the animal. The indicating system includes a countdown clock to the preferred time period of insemination. In the event that the insemination fails, an indication is provided about whether the actual time of insemination occurred at the preferred time of insemination indicated to the worker. When estrus is completed, a confidence level is provided about the likelihood of success based on the position of the actual time of insemination relative to ovulation.
