I have a 4 year old angus cow with twins that were born January 28th, she is in great shape has access to hay and fed grain every day because of the twins. The twins are creep fed to help the cow out a little. She has not came into heat yet and the calves will soon be 4 months old. She is with 6 other cows and has a heat patch on. I am assuming it is because of the twins is why. I was wanting to AI on a natural heat but since that isn't happening any suggestions on jump starting her cycle or protocol recommended?