91 
either does not develop or is of short duration. In this case 
also the milk production, especially when the cows do not 
abort before the 5th or 6th month, is satisfactory, and the 
conception takes place very soon. The reason for a de- 
creased milk output is more the usual metritis than the abor- 
tion, and the same is true of the temporary sterility. In 
consequence of the possibility of treating and curing the 
metritis after abortion, it would be inadvisable to postpone 
the breeding of such cows for 4-6 months. This period is no 
guarantee against the infection of the bull, and causes con- 
siderable losses in the milk production. 
The following examples are pertinent: 
1. Inthe herd of Mr. J., Skovgaard, 13 out of 24 animals, 
aborted during December 1905 and the year 1906; most of 
them from January to May 1906. One of them retained the 
placenta, and one was sold for a defect of the udder; the 
others all became pregnant. Three aborted for a second 
time, two of which conceived again. 
2. Of the 34 cows in the herd of Mr. K., Langemyre- 
gaard, 14 aborted between November 1906 and December 
1907, most of them, however, in the winter 1907. All of 
the cows retained the secundinae; eight became pregnant 
again and one aborted for a second time; four had been sold, 
two shortly after the calving; one had an incurable metritis 
and cysts of the ovaries; and one was carried over under 
treatment. 
3. In the herd of Mr. J., Raaby, 16 cows aborted out of 
24 between August 1906 and November 1907, 12 of them 
between November 1906 and April 1907. Most of them 
retained the placenta, which was removed in only a few; 
all of the animals came under treatment only a considerable 
time after the calving. 14 cows became pregnant again, and 
one aborted for a second time. Ten gave birth to a normal 
calf in the next year. 
4. Between December 16, 1906 and April 23, 1907, Mr. 
B., Vaermelandsgaard, had 15 out of 23 cows abort. Twelve 
