Abortion in sows.

Of a total of 31,766 pregnancies 465 abortions were reported, in average 1.46 %. By comparison of the frequency of abortion at different times of the year a significantly higher percentage of abortion was found in sows inseminated during the summer months. No significant difference was found between 68 boars as to the frequency of abortion. In 248 abortions 23 (9.3 %) aborted due to acute erysipelas suis, 5 due to non-infectious diseases, 4 due to spoiled food, but 216 (87.0 %) sows aborted without any previous symptoms.