This study was carried out on /516/ fish individuals of Chub Mackerel Scomber
japonicus (Houttuyn, 1782), which were caught from the Coastal water of Latakia
province (Levantine basin) from December 2014 to November 2015, to identify the
evolution
stages of sexual maturity (by morphological and histological methods)
and determine the spawning period of this important economic species. The results
showed that Scomber japonicus begin with sexual maturity from the beginning of
February and extend until mid-May, with a single peak in Mars. The average value
of the gonado-somatic index (GSI) was (12.46 ± 1.52)% for males and (13.21 ± 3.9)% for
female in Mars. And the total body length at sexual maturity was (21.5) cm for
males, and was (23.5) cm for females. The development stages and gonad maturation
in this specie, are similar with regard to the tissue and the form of gonads and
according to the six gonad maturation steps.
This study was carried out during 2011- 2013 to determine some qualitative and
quantitative features of some distribution trees of Prunus ursina in different regions of
Syrian coast.7 natural distribution sites were determined and 43 trees were det
ermined as
samples.
22 features of different plant portions were studied using biological
measurements(leaves, flowers, fruits, seeds). Statistical analysis of investigated phenotypes
showed that trees were distributed in 5 groups (A, B, C, D, E) each one considered
phenotype. The results showed existence of one phenotype in several sites (C, D, E) while
(A and B) phenotypes were distributed in one site, while (A) phenotype was located in one
tree only in " Nabeen" site whereas (B) phenotype was located on only half investigated
trees in "Btmaze" site, while the other half distributed in (D) phenotype.
The purpose of this research was to determine the effect of the corpus luteum in
various stages on morphological characteristics of cumulus oocyte complex consequently
on the yield of morphologically intact oocytes for in vitro culturing.
Oocytes
were collected from cow ovariesof animals after slaughter.
Ovaries were divided into the following four groups: (a) ovaries with corpus
hemorrhagicum; (b) ovaries with a functional corpus luteum;
(c) ovaries with regressing corpus luteum (albicans) ;( d) ovaries without any luteal
structure.
The results of this research show that, the intact oocytes yield for in vitro culturing
differs accordingly with the stage of the corpus luteum.
The highest percentage of intact cell(8.1 ± 1.6) were recorded in ovaries without
corpus luteum , whereas the lowest percentage of intact cells were recorded in ovaries with
regressing corpus luteum(5.5 ± 1.3). There was significant difference (p < 0.001)between
the two groups for intact cells.
The aim of this research is to determine the effect of seasonal changes on the
yield of morphologically intact oocytes for in vitro maturation and consequently
for fertilization and embryo production. Determining the impact of seasonal
changes hel
ps us to increase the intact oocytes yield, and better use of in vitro
culturing technique of cow oocytes. This leads to: benefit from animals of
genetic superiority, maintenance the biodiversity of animal genetic resources by
using deep-freezing technique of pre/post in vitro fertilized oocytes taken from
cow ovary of animals after slaughter.
The results of this research paper show that, the intact oocytes yield for in
vitro culturing differs accordingly with year seasons. The lowest percentage of
intact cells 29.5 were recorded in the period between May and September,
whereas the highest percentage of intact cells 42.6% were recorded in the
period between October and March. There was significant difference (P<0.001)
between the two periods for intact cells.
يأتي هذا البحث في إطار دراسة تتناول مجمعات رخويات المياه العذبة في جنوب سورية، الهدف منه
تحديد أنواعها و توزعها. و قد أظهرت الدراسة وجود عشرة أنواع في مياه الينابيع و الجداول الواقعة في
السفح الشرقي لجبال الحرمون. تنتمي تسعة منها إلى صف بطنيات القد
م Gastropoda و نوع واحد إلى
صف ذوات المصراعين Bivalvia.
