[维生素A缺乏症奶牛胎盘及胎儿的形态学变化]

[Morphological changes in the placenta and in fetuses in cows with hypovitaminosis A].

作者信息

Angelov A K

出版信息

Vet Med Nauki. 1983;20(1):54-60.

Abstract

Studied were morphologically 12 aborted fetuses of cows, 12 placentas of cows that miscarried, 6 placentas of cows with normal birth but with certain lesions, and 6 uteri of cows that miscarried, originating from various regions of the country. No organisms were found in both the placentas and fetuses. Carotenes in cows that miscarried gave the following values: 0.123 mg%, 0.287 mg%, 0.342 mg%, 0.684 mg%, 0.160 mg%, 0.168 mg%, 0.231 mg%, 0.430 mg%, and 0.484 mg%. Six grams of liver tissue of one of the slaughtered cows contained as many as 36 UI of vita. A. Gross investigations of the placentas revealed gray-whitish to gray-yellowish, round or oblong bulgings of 1-2 cm length. Histologically, hyperplasia and metaplasia of the surface epithelium were established, which from a monolayer one changed through metaplasia into a multilayer, flat, and cornificating one. In the lung, tongue, intestines, and vesical bladder of the fetus as well as in the endometrium of the cows that miscarried there were hyperplasia and metaplasia of the epithelium.

摘要

对来自该国不同地区的12头流产奶牛胎儿、12头流产奶牛的胎盘、6头正常分娩但有某些病变的奶牛胎盘以及6头流产奶牛的子宫进行了形态学研究。在胎盘和胎儿中均未发现生物体。流产奶牛体内的胡萝卜素含量如下：0.123毫克%、0.287毫克%、0.342毫克%、0.684毫克%、0.160毫克%、0.168毫克%、0.231毫克%、0.430毫克%和0.484毫克%。其中一头屠宰奶牛的6克肝脏组织中含有多达36国际单位的维生素A。对胎盘的大体检查发现有灰白色至灰黄色、长1 - 2厘米的圆形或椭圆形隆起。组织学检查发现，表面上皮细胞增生和化生，从单层上皮细胞通过化生转变为多层扁平角化上皮细胞。在胎儿的肺、舌、肠和膀胱以及流产奶牛的子宫内膜中均有上皮细胞增生和化生。