Vie CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. Il

Experiment IT:

In 1966 the possibilities of a complete
synchronisation of oestrus were explored, P.M.S
and HCG were used in combination with the I.C.I.
33.828 compound (table).

To 4O gilts 1 mg compound per kg bodyweight was
administered; to 15 sows 0,9 per kg bodyweight.

On the pre-determined insemination daite “all
animals were checked for heat symptoms. These
symptoms were scored on a scale from 0-5 (table).

In good a.i. practice animals with a "heat score"
lower than 3 should not be inseminated.

DISCUSSION. The synchronisation-indices (1) are
rather low in experiment I, this may be due to
generally lower fertility in the experimental

herd during the trials. Because we experienced a
lower synchronisation index for sows in experiment

I we lowered the compound dose to 0,9 mg per kg
bodyweight in experiment II. In experiment I cysts
were never found in autopsied ovaria. In experiment
II cysts were found in several slaughtered animals;
those cysts are expected to be due to the medication
with gonadotrophins. Five animals were found in heat
after 2—2% months pregnancy. They were not mated
during this heat period and delivered a normal litter
from the mating after the synchronised heat.

The decrease in suckling time, experienced on the
lactating sows in experiment I, must be due to the
compound administration. Probably the compound does
not only block the release of gonadotrophins but
also Tthat (0f OXy D CITIES

In order to get a complete synchronisation of
oestrus one should use the treatment combination
of group B in experiment II. These animals are
injected 750 I.U. P.M.S. the day after ending the
20 day compound feeding. Four days after ithe P.M:Se=
injiection’ 500NETUCSHCG Y are injected,

The "heat score" seems to be a good criterion
to express the success of the synchronisation
procedure.

(1) D. SMIDT und J. STEINBACH, 1965.

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