Question: asking about articificial insiminition of goat 
Answer: recommended to the doe's estrous cycle
the doe's estrous cycle is the interval between two estrus or heat periods that lasts an average of 21 days. the estrus or heat can last from 12 to 48 hours. during estrus does are receptive to being mounted by bucks. for artificial insemination, it is important to identify when a doe is in heat. producers are encouraged to utilize teasers, usually a vasectomized buck to identify a doe in heat. the signs of a doe in heat are:

swelling of the vagina
seeking the buck
standing for mating by the buck, teaser, or by other does
frequent urination
flagging tail
vocalization
presents vagina with mucus discharge that appears crystalline at the beginning, but may have a cheesy appearance near ovulation tim