Hemeida N A, Sack W O, McEntee K
Am J Vet Res. 1978 Dec;39(12):1892-1900.
Dutculi efferentes were studied by microdissection and histologic methods in 2 boar, 6 goat, 5 ram, 25 bull, and 19 stallion epididymides. On the basis of the present findings and the data of others and relating them to the total number of specimens examined in each species, an estimate (narrow range) was made of the minimal-maximal numbers of efferent ductules as follows: dog 13 to 15; cat 14 to 17; boar 14 to 16; goat 18 to 19; ram 17 to 20; bull 13 to 16; and stallion 14 to 17. The histologic appearance of the efferent ductules of the bull, including measurements of their diameter, lumen, and epithelium, was briefly described. Attention was focused on the presence of blind-ending ductules, because it was thought that they might be a factor in the cause of spermiostasis. Blind-ending ductules were found in 1 of 2 porcine, 1 of 6 caprine, 2 of 5 ovine, 8 of 25 bovine, and 13 of 19 equine ductules per affected male were 4 in the boar, 1 in the goat, 2 to 3 in the ram, 1 to 5 in the bull, and 1 to 14 in the stallion. From our work, it appears that in the bull and stallion at least, blind-ending ductules were present in sufficient numbers to be considered a factor in spermiostasis and the infertility resulting from it.
采用显微解剖和组织学方法，对2头公猪、6只山羊、5只公羊、25头公牛和19匹种马的附睾输出小管进行了研究。根据目前的研究结果以及其他研究的数据，并将其与每个物种检查的标本总数相关联，对输出小管的最小-最大数量进行了估计（窄范围），如下：犬13至15条；猫14至17条；公猪14至16条；山羊18至19条；公羊17至20条；公牛13至16条；种马14至17条。简要描述了公牛输出小管的组织学外观，包括其直径、管腔和上皮的测量。重点关注盲端小管的存在，因为认为它们可能是精子停滞原因的一个因素。在每只受影响的雄性动物中，发现盲端小管的情况如下：2头公猪中有1头，6只山羊中有1只，5只绵羊中有2只，25头公牛中有8头，19匹种马中有13头。每只受影响雄性动物中盲端小管的数量为：公猪4条，山羊1条，公羊2至3条，公牛1至5条，种马1至14条。从我们的研究来看，至少在公牛和种马中，盲端小管数量足够多，可被视为精子停滞及其导致的不育的一个因素。
