Pineda M H, Reimers T J, Faulkner L C
J Am Vet Med Assoc. 1976 Mar 15;168(6):502-3.
Ejaculates of bilaterally vasectomized dogs contained spermatozoa as long as 21 days after vasectomy, indicating that spermatozoa in the canine ejaculate originated from both the epididymides and the vasa deferentia, not from the epididymides alone.
双侧输精管切除的犬类，其射精中在输精管切除后长达21天仍含有精子，这表明犬类射精中的精子不仅来源于附睾，还来源于输精管，而非仅来自附睾。
