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

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MORPHOLOGICAL OBSERVATION ON TWO CASES OF ACARDIUS AMORPHUS IN HOLSTEIN-FRIESIAN CATTLE

KOJIMA, Yoshio;KAWATA, Keiichiro

Permalink : http://hdl.handle.net/2115/4684
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Abstract

Two cases of acardiac monsters obtained from Holstein-Friesian cows were examined radiologically, macroscopically and microscopically. These monsters were each co-twinned with a normal calf. They were approximately spherical or ovoid in shape, weighing 200g and 455g, respectively, and covered with hairy skin. One of them was an interesting rare case which had never been reported in the literature : This case was covered completely with highly edematous amnion-like membrane, in some parts of the inside surface of which metaplasia had occurred, showing there almost normal skin structure. In addition, this case possessed an oral-like opening with comparatively well-developed tongue-like structure, a small bone and two small cavities resembling rudimentary digestive organs. Also, in the other case, a very small oral-like opening and a small cartilage were observed. Histologically, both cases were composed mainly of connective tissue, fat tissue and striated or smooth muscles, but the degree of development in these tissues and organs remained at the embryonal stage, and their arrangement was irregular. According to OGATA's classification of acardiac monster, these two cases belong to the category of acardius amorphus totalis. The present authors wish to express their gratitude to Assistant Professor M. OHBAYASHI, of the Department of Parasitology, for his kind advice, also to Assistant Professor T. KOIKE, of the Department of Veterinary Surgery, for his assistance in radiological examination. Likewise, the authors would like to express cordial thanks to Professor T. ISHIKAWA, chief of the Department of Veterinary Obstetrics, for his kind reviewing of this paper, and they would like to say many thanks to Messrs. Y. CHIBIKI, M. MORIYA and S. KIMURA, Veterinarians of the Artificial Insemination Center of the Sapporo Dairy & Agricultural Co-operative Association, for their kindness.

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