| dc.description.abstract |
The 30 ouled djellal ewes used in this study were divided into 2 equal groups, Group
1, used for synchronization of oestrum group 2,as control.
In the anestrous season (December 1992), the ewes of the first group were treated
with 40 mg Fluorogcstone acetate (FGA) impregnated intravaginal sponges for 14
days, at the time of sponge withdrawal, the ewes were treated with an
intramusculaire (im) injection of 700 U1 pregnant mares'serum gonadotrophin
(PMSG). In the estrous season (June 1993), the same group which was treated in
December, was treated with two injections of 100 fxg/ injection for each ewe
of prostaglandin F-2ocanalogue at a time interval of 9 days. In the two periods of
synchronization of oestrus, all ewes were subjected to fertile rams after the
treatement (3 rams for 15 ewes ) for 10 days. Plasma progesterone and LH
concentrations were determinited following the two different treatements, showed
that, the endocrine changes during the induced cycle were not significantly
different from those during a naturel cycle.
Five important reproductive aspects were studied as follows :
For the first treatement (FGA /PMSG) :
The percent of oestrus is 93.33% and 26.6% respectively; the fecondity is 100%
and 26.66% respectively; the fertelity is 80% and 26.66%, the prolificacy is
125% and 100% respectively the mortality is 6.6% and 0% respectively.
For the second treatement with prostaglandin F-2oianalogue :
The percent of oestrus; the fecondity; the fertelity; the prolificacy and the
mortality were :
(100% , 60%); (106,66%, 66.66%); (93.33% , 60%); (114.28% , 111.11%) and (0%.
0%) respectively.
These results demonstrated that the two technics used in this study can
successfully control oestrus in the ouled djellal ewes. |
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