It is not recommended to spay/neuter male cats during their heat cycle. Male cats tend to be more agitated during this time, which can hinder their recovery after surgery.
During estrus, male cats have increased blood supply to their testicles and spermatic cord, which can easily lead to significant bleeding during surgery. The surgical wound will also be larger, prolonging the recovery time. Furthermore, male cats have relatively weaker immune systems during estrus, increasing the risk of wound infection during surgery. In short, for the health and safety of male cats, it is recommended to perform spaying/neutering surgery after the estrus cycle has ended.
