The Influence Of Priming Two Cucumber Cultivar Seeds

J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 166-170, 2010
168
Glucose (mg/dl)
88
86
84
82
80
78
76
74
72
70
6 month 8 month at puberty
Fig. (1) Mean total glucose (mg/dl) of ewe lambs fed two levels of protein during
various period of the experiment.
Correlation coefficient between age and body
weight at puberty and some metabolites
traits:
It has been suggested that sufficient body
growth is a consequence of metabolic changes
occurring before and around the onset of
puberty (Suttie et al.,1991) .Therefore, it is
plausible to think that those changes serve as
peripheral signals to initiate puberty(Sakurai et
al.,2004) .In the present work, the correlation
coefficients between protein and each of body
weight and age at puberty was non significant
being -0.003 and -0.132 , respectively .Also, the
correlation coefficients between cholesterol and
each of body weight and age at puberty were not
significant being 0.098 and -0.185
respectively(Table 2). These results suggest that
plasma metabolite concentrations per se are not a
significant trigger for the onset of puberty in
Karadi ewe lambs. Similarly, Sakurai et al.
(2004) Indicated that some metabolites including
non estrified fatty acids, ketone body and acetic
acid are not considered a significant trigger for
the onset of puberty in Shiba goat.
Time changes in plasma concentrations of
glucose are shown in (Figure 1). It appears from
the figure that glucose concentration relatively
maintained the same (79.35-85.42) during the
course of study. Furthermore, the correlation
coefficient between glucose and weight at
puberty was significant (0.247), while with age
Protein 12%
Protein 16%
was not significant (0.063) (Table 2). Also,
Foster and Bucholtz (1995) reported that LH
secretion is suppressed by the central
administration of glucose inhibitor in developing
sheep, and suggested that glucose availability
has a critical role in the onset of puberty.
Therefore, the central sensors that detect the
availability of particular circulating metabolites
may change before the onset of puberty. Insulin
is considered to be one of the metabolic signals
linking nutritional status with pulstile
GnRH/LH secretion in ruminants, because
circulating insulin concentration are positively
correlated with the nutritional status(Hileman et
al.1990;Studer et al.,1993) ,and insulin acts
centrally to stimulate pulstile LH release
(Tanaka et al.2000) . In the current work, insulin
was correlated positively (p