PATHOLOGICAL STUDIES ON STERILITY IN DAIRY COWS
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概要
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Investigative results are as follows : 1. In order to ascertain the actual condition of the sterility in dairy cows, the author investigated a total of 373 cases histopathologically which were classified into 2 groups A (87 cases and B (286 cases). A group consists of infertile cows which have considerably detailed clinical history. B group consists of slaughtered cows. 2. In A group, endometritis catarrhalis chronica (44.8%), ovarian cyst (40.2%), colpitis catarrhalis chronica (36.9%), ovarian small cystic degeneration (26.4%), cervicitis cat. chr. (24.1%), hydrosalpinx (9.2%), perimetritis (6.9%), hyperplasia glandularis cystica endometrii (6.9%), etc. had high frequency. 3. In B group, colpitis (43.4%), ovarian cyst (18.5%), cyst formation in vagina (11.8%), endometritis (10.8%), cervicitis (9.8%), ovarian small cystic degeneration (8.0%), cyst in perioviduct (7.1%), hyperplasia cystica glandularis endometrii (5.2%), lutein cyst (4.5%) and cystadenoma in vagina (3.9%), etc. were frequently observed. 4. The most interesting finding in ovaries is small cystic degeneration. This change is more observed in infertile cows than in healthy cows. It is considered that change disturbs the estrous cycle as a factor of sterility. 5. Pathologic alterations of the oviducts are considered as an important factor of sterility ; they show high frequency. Perimetritis which is considered as an adhesion (clinically) is an important factor clinico-phthologically. 6. Cystic glandular hyperplasia of the uterine mucosa are considered to have a connection with cystic ovarian degeneration. However, on the other hand, it is necessary to study endometritis catarrhalis chronica in the future. 7. Colpitis and cervicitis have unexpectedly high frequency. 8. The author considered that in order to ascertain the true causes of sterility clinical, pathological, bacteriological, biochemical, endocrinological and hereditary observations must be made from a wide view point in the future. Especially there must be studies of malnutrition, hormonal disturbances, partial symptoms of general diseases and disposition in an attempt to give an explanation to the cause of the non-contagious common diseases.
- 北海道大学の論文
- 1956-12-25
著者
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