The Herd Pregnancy and Servicing Calculator app allows the user to input reproductive parameters from his herd and then calculate the required number of pregnancies and servicing per interval to maintain the herd. To begin, the user should enter the herd size, calving interval, pregnancy loss rate, culling rate and death rate. Then the user should enter the average conception rate for lactating cows and the average conception rate in virgin heifers. To obtain the data for text fields required, y