The Influence Of Priming Two Cucumber Cultivar Seeds

J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 148-152, 2010
851
Table (18): Effect of insulin treatment on ovarian response and recovery in Karadi ewe lambs
super ovulated with FSH.
No. animals treated
No. animals exhibiting estrus
(%) of animals exhibiting estrus
Ovary weight (g)
Diameter of corpora lutea(mm)
Ovarian response
No. animals responding to treatment
% animals ovulated
No. corpora lutea
Ovulation rate (C.L./ animal)
No. unovulated large follicles
Unovulated large follicle/animal
White (a vascular ) C.L./ animal
No . of ova recovered
(%) of ova recovered
Parameter Control Insulin
13
13
100.0
2.31±0.15 a
6.65±1.35 a
9
69.23
13
1.44±0.22 a
6
0.50±0.19 a
2.53±0.36 a
11
84.6
12
12
100.0
2.06±1.32 a
6.67±1.26 a
9
75.00
14
1.56±0.24 a
11
0.84±0.19 a
2.91±0.86 a
5
35.7
Means with different letters within each row differ significantly.
The slightly higher total ovarian response in
the insulin group than the control group
indicating the effect of insulin on
folliculogenesis (Selvaraju et al., 2003). The
beneficial effect of insulin on ovarian response
in treated group might be due to either increase
in follicular recruitment or rescuing follicles
from atresia .Exogenous administration of
insulin affects the follicular dynamics by
increasing recruitment of follicles and reducing
follicular atresia (Matamoros et al., 1991;
Majumdar et al., 1997). Positive correlation
between the number of gonadotropins-dependent
follicles and peripheral concentration of insulin
in sheep has been reported (Armstrong et al.,
1983). Insulin act synergistically with FSH and
LH through its own receptors to stimulate
granulose cell mitosis (Matamoros et al., 1991 ;
Gong et al., 1994 ).
Also, insulin mediated glucose uptake
increases ovulation rate by promoting cell
growth (Dowing et al., 1995). The presence of
unovulated large follicles may be due to a lack
of LH receptors, or an inappropriate stage of
development at the time of the endogenous
preovulatory LH surge (Kumar et al., 1992).
Thus, a beneficial effect of insulin priming on
ovulation rate in super ovulated Karadi ewes
would require longer period of time than that
used in the current study. There is a need to
reduce the proportion of unovulated large
follicles in order to improve ovulation rate. The
presence of a vascular corpora lutea in super
ovulated ewes is in accordance with the reports
of other workers (Armstrong et al., 1983;
Saharrea et al., 1998). The percent of ova
recovered was 84.6 and 35.7% for control and
insulin treated groups, respectively. (Table 18).
These differences could be attributed to the
individual variations both within and between
groups in the time of ovulation and to the
number of animals ovulated in each group.
Previously, Selvaraju et al. (2003) stated that the
total ovarian response (corpus leutum and
unovulated large follicles) was significantly
(P