First of all select the "Animals" page.
In the next page, scroll down to the "Individuals" section and select.
Enter the pre-mating heats in the pop-up window as shown.
Simple as that.
This information will then be used to show the number and percentage of cows that are bulling pre-mating and also to identify non-bulling cows so that there can be detailed information on which to base your mating management decisions.