Abstract
The Serotest, immunological pregnancy tests of mares, was studied on 282 sera of 196 mares and 3 stallions at Tokachi and Hidaka districts in Hokkaido, from May to September in 1967.
Results obtained may be summarized as follows;
1. Accuracy of tests on nonpregnant mares and stallions was 100.0 %, but on pregnant mares, it varied with gestation periods. That is, at 1 to 29, 30 to 44, 45 to 80, 81 to 120 and more than 121 days after the last service, accuracy of tests was 6.3, 51.7, 96.6, 40.0 and 40.0 % respectively.
2. Positive reactions with this test were first observed at 3946 days and continued to 76126 days of gestation through long-term observations of 5 pregnant mares.
3. Accuracy of tests on light horses was seemed to be higher than that of half blood or heavy horses.
4. Eight mares out of 160 were suspected to have aborted through this tests and biological assays.
