part of the male reproductive system in cattle that can be injured causing bull not to retract his penis: a…

Brief Explanations:

The sigmoid flexor is a part of the male - reproductive system in cattle that helps in penis retraction. Injury to it can prevent the bull from retracting his penis. The cervix is part of the female reproductive system. Cowper's gland is related to semen production and secretion but not directly to penis retraction. The scrotum is a sac that holds the testicles. There is no such standard term "Shreak" in this context.

Answer:

e. Sigmoid Flexor