If you use lute once do you continually have to use it for the said doe to come back into heat? The lady vet taking over for my vet said that is how it works.... I've had 2 Nubian/Lamancha does they are 5. Ran with a kinder buck for 6 months and nothing... They ran with a Nigerian buck the year before that and nothing... I would like to lute to see if that helps, but I don't want to do that every year though...