79 
cases, I give the exact time in which the fecundation took 
place. I could not include all the animals, since I did not 
always have complete lists, and as a part of the cows became 
pregnant after I finished this report. 
Out of 1,004 cows the following numbers became preg- 
nant in the following time: 
510 within 6 weeks. 
187 within 2 months. 
135 within 3 months. 
64 within 4 months. 
48 within 5 months. 
39 within 6 months. 
21 within more than 6 months. 
The number of animals which became pregnant inside of 
the first three months is therefore 832, or 83%. It is likely, 
therefore, that if the animals come under treatment soon 
after the last parturition, in 83% of them sterility can be 
prevented. The normal term between two deliveries is 15 
months; if, therefore, the cow calves later, a temporary ster- 
ility is present. To prevent this condition the cows have 
to come under treatment early. 
In the last two columns of the tabulation the animals are 
given which carried over into the next year, and those which 
were discarded as hopeless. The first number 154 or 10%, 
the latter 180 or 12%. Of the animals which were carried 
over not all are sterile ones, as some came under treatment 
shortly before the end of the year. Among the discarded 
ones all animals are included which were treated, even if 
found to be incurable after a short trial; not included, how- 
ever, are the animals which were eliminated in the 
first examination. Among the latter are all the animals 
which had been sterile so long that a treatment would have 
been unreasonable. In every herd many of such cows are 
found at the beginning of the treatment. 
In the now following tabulations is recorded the treat- 
ment of the animals which had aborted is recorded. 
