pregnancy. In the fourth week of it, on the 1nferior
wall of the base of the pregnant horn a thin-walled,
fluctuating ampulla begins to form, which graduslly en-
larges. If the death of embryo occured on the end of
the first or in the begining of the second month of
pregnancy, it was found, that the tension of the uteri-
ne horns, only a little reduced, persisted subseguently
during some period of time, sometimes one month or len=-
ger. The ampullar distension did not exist, as the
amniotic fluld was resorbed; the follicles, if existed
on the ovaries, were rather small, hard and painless.
If this state was found in 6-10-th weeks after mating
the diagnosis of the e.d. was allways confirmed after
wards. In rare cases this state lasted 3 months after
mating.

If the e.d. occured during the second half of the .
2-nd month of pregnancy, even little later, the state
of the uterus was ocasionally found, in which either
the amniotic fluid was not yet fully resorbed, or the
ampullar dllatation of the pregnant horn did not under-
went involution yet. The tension of the uterus existed
and the base of one horn was dilated; however, his bot-
tom wall was thick, not fluctuating, and a little lower
suspeaded, as the other horn. The diagnosis of the e.d
ia this period was more difficult, and sometimes the
examingtion was repeated after 2-3 weeks. In such case
elther only slightly expressed tension of the horns or
fullfi flaclid empty uterus were found, with distended
one horn. Sometimes larger and painful follicles exist-
ed on the ovaries.

It seems, that not allways after the death of embryo
on the end of the second month, the uterus of the mare
returned to the state of the tension, characteristic to
the 3-d week of pregnancy. Cases were observed, in
which in few days after as certainment of the two-
-months pregnancy, oestrus occured. Probably, if the
relation of progesterone to estrogens, which is neces-
sary for the state of the temsion, has already changed,
the state of tension does not return. If during the
first examination for early pregnancy this was diagno-
sed, and during the second examination the uterus was
flaccid and thin walled, the diagnosis of the previous
death of embryo was based, 0f course, on the first
statement of pregnancy.

The course of 16 cases of e.m., investigated in one
Thoroughbred stud during 7 years, i1llustrates table 1.
In 8 cases, in which the death of embryo was clinically
diagnosed during the period of decrease of pregnancy
symptoms, it appeared in the 2-d month of pregnancy .

 

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