When used in conjunction with prostaglandins no heat detection is necessary making timed AI a possible option. The one-shot method is to heat detect and breed animals according to natural estrus for the first five days. Inject prostaglandin on the morning of the sixth day. Continue to heat detect and breed according to induced estrus for the following five days. In the other method, all animals are injected on whichever day you decide to begin your program, followed with another injection 11 days later.
Heat detect and breed animals throughout the next five days.
In many cases the first injection is given 11 days before the end of the voluntary waiting period. For example, if you normally operate with a 50-day waiting period, the first injection can be given 39 days postpartum. Prostaglandin is a very effective product. Granted every program has its disadvantages. The disadvantage of the program is the ability to catch cows in heat and the ability of cows to express estrus.