[An investigation of cows offered for the fourth time for insemination (author's tranls)]

In a few A.I. associations an investigation covering all cows offered for insemination for the fourth time was performed. In all, four hundred such animals were examined clinically. Depending on the findings, the animals put into a number of diagnostic groups. Later on, a survey was made of which animals had become pregnant and which had not. Some of the animals which had remained barren were brought in for a more detailed study. Special attention was here given to late ovulation.