My heifer is not getting pregnant after repeated ai what should be the problem after 18 days she comes back into heat

Repeat heat at eighteen days usually means the heifer is not conceiving, and the common reasons are poor heat timing, silent heat, uterine infection, ovarian cyst, or semen handling and AI technique issues. First, make sure AI is done at the right time in standing heat, not too early or too late. Then check whether she has any vaginal discharge, foul smell, thin body condition, or a history of difficult calving or abortion. If she is cycling regularly but not settling after several services, she needs a reproductive examination by a vet with rectal check or ultrasound to see the uterus and ovaries. Keep her on good green fodder, enough energy, mineral mixture, and clean water, because weak body condition also reduces conception. If she has repeated returns to heat after three or more AIs, book a Pashu Vet on Pashushala for a proper fertility check. Treating the cause now is far cheaper than losing another breeding cycle and delaying the first calf.