Japanese Journal of Veterinary Research;Volume 8, Number 1-4

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ANATOMICAL AND PATHOLOGICAL STUDIES ON THE SEX ORGANS FROM SLAUGHTERED BULLS IN HOKKAIDO : II. SOME OBSERVATIONS ON REMNANTS OF THE MULLERIAN DUCT

KANAGAWA, Hiroshi;ISHIKAWA, Tsune;KAWATA, Keiichiro;FUJIMOTO, Yutaka

Permalink : http://hdl.handle.net/2115/4690
JaLCDOI : 10.14943/jjvr.8.1-4.323

Abstract

In the course of the post-mortem routine investigation of the sex organs of 19 mature bulls, the present authors encountered 6 cases having remnants of the Mullerian duct. These Mullerian remnants were located on the dorsal surface of the urogenital fold. They seemed to be grouped into two types; one is the tubular type which is characterized by a passway connecting with the urogenital canal, while the other is the small vesicular type without connection to the urogenital canal. Most of the cases belonged to the latter type, only one case belonging to the former type. Microscopically, both types of Mullerian remnants had a narrow central cavity lined with a single layered or stratified epithelium, consisting of cuboid, columnar, flattened and ciliated epithelial cells. Many smaller accessory cavities surrounding the central cavity resembled the female bovine uterine glands. But, the development of the accessory cavities varied from case to case. The lumina of the central and accessory cavities contained secretory products. The wall of the remnants consisted of connective tissues and several layers of smooth muscles. Thus, the histological features of the Mullerian remnant in the bull were very similar not only to those of the immature heifer uterus, but also to the Mullerian remnant observed in the case of "White heifer disease". As regards many problems concerning the rate of incidence, heredity or function of the Mullerian remnants in the bull, much remains to be studied. The present authors are indebted to Inspectors of the Sapporo Abattoir, for their great kindness and to members of the AI centers and farms who kindly sent the clinical data on the bulls used for this investigation.

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