This study was done to evaluate reproductive potential of male mice following
early exposure to dimethoate. Thirty-six Swiss albino male mice were divided
into three groups of twelve mice each: first group injected intraperitoneally with
distilled
water, and used as a control group, while second and third groups injected
with dimethoate at doses of 0.1 and 0.2 ml dimethoate/100 ml distilled water,
respectively for 7 days. At the end of experiment, the mice were weighed and then
were killed. Testis and epididymis weights were recorded, sperm parameters were
evaluated.
This study has been carried out on Saddled bream , from the
family of Sparidae, which was caught from the coastal waters of
Tartous province.
The results showed that, Saddled bream reached at the fifth stage
of sexual maturity during April and May for males and females,
and the study of the sexual maturity index GSI confirmed these
results.
A total of 410 Sardinella aurita Fish , were collected from Syrian coast during the
period from April 2014 to March 2015.Total length and weight ranged between 81 – 270
mm, 6.94 –137.29g respectively. The aim of present study was to illustrated som
e aspects
of reproduction biology for Sardinella aurita. .
Gonads Somatic Index (G.S.I.) for female and male recorded highest value in early
June 4.22 and 5.80 respectively. Male and females round sardinella reach first sexual
maturity at total length (17.97 cm and 18.67 cm respectively).
Mean absolute fecundity (FA) increased with body length ( ) and
weight ( ), with an average of 20714.79 ±4876.21 oocytes produced per
spawning female. Relative fecundity (FR) ranged between 242 and 285 oocytes/g of body
weight (average: 266.17 ±21.49 oocytes/g).
The study on the frequency distribution of eggs diameters revealed the presence of
one beak of sardinella aurita. The egg diameters of sardinella aurita ranged between
0.2mm -0.7mm with an average 0.45±0.18 mm.
This study has been done on Sparus aurata (Sparidae). Fish samples (297
individuals) were collected along the Syrian Coast from March 2012 to February 2014.
Total length (T) was 15 - 31 cm, and the total weight (W) was 53,1 - 410,34 g. The study
o
f gonado somatic index (GSI) showed that the reproduction period was between
November and February with a maturity peak in January (3.98±0.97)% for females ,and in
December (2.19±0.29)% for males. In addition, the length at the first sexual maturity was
(21.5 cm) and (22.5 cm) for males and females respectively. The results of the hepato
somatic index (HSI) was compatible with the surrounding environmental and physiological
changes which resulted from the change of sexual activity during the reproductive cycle.
Fecundity showed a wide range for a given length, there was a linear relationship between
the absolute fecundity and each of length groups and total weight. Relative fecundity was
(567896-849362) egg per 1kg body weight. The frequency distribution of eggs diameters
revealed the presence of one peak, and the eggs diameter during the reproduction period
ranged from 0.05 to 0.3mm.
This research was carried out on 314 individuals of L. mormyrus fish caught in front of the shores of Lattakia Governorate (Al-Basit - Lattakia area - Jableh) during the period from 20-9-2012 until 16-9-2013 by different fishing methods used locally, especially the gulsim lined nets. and cages.
تتمثل أهم مصادر المعلومات لتقدير مستوى الخصوبة أو اتجاهها بشكل أساسي في معدل
الخصوبة الكلي و معدل التكاثر ( التوالد ) الصافي و عدد الأطفال النهائي لجيل من الإناث أو
لسنوات عقود الزواج، و لكل من هذه المعدلات ميزاتها و مساوئها، و من أهم هذه المساوئ:
عدم توافر معلومات عن معدل الخصوبة الكلية و معدل التكاثر الصافي بعد سنة الدراسة،
كما يجب أن تكون المعطيات عن عدد الأطفال النهائي لجيل من الإناث أو لسنوات عقود
الزواج متوافرة لفترة طويلة تمتد من ( 15-30 ) سنة.
و تجدر الإشارة إلى أن المعطيات المتوافرة حاليًا لأي مجتمع سكاني متأثرة بالتركيب العمري
له، بالإضافة إلى تأثرها بالتقلبات الموسمية و بطول أيام الشهر و توزيع أيام الأسبوع.
نقدم في هذا البحث طريقة جديدة لتقدير معدل الخصوبة الكلية بعد تصحيحه من التقلبات
الشهرية، و الأسبوعية و الموسمية انطلاقًا من أعداد المواليد الخام الشهرية، و تستند هذه
الطريقة في التقدير إلى أساس العلاقة الموجودة بين أعداد المواليد و معدل الخصوبة الكلية
و عدد جيل الإناث في عمر الإنجاب.
This study aimed to compare the susceptibility of five wheat varieties
Eratom, Al-Iz, Rabea, ACSAD and Om-Rabei to infestation by Khapra beetle
by estimation of population density of insect phases, population reproduction
rate and the loss in germ
ination percentage at two levels of infestation 2 and 4
pairs/ 100 gr. grains and four storage periods 3, 6, 9 and 12 months under
natural conditions.
Results showed significant differences between varieties. Eratom was the
most susceptible variety and the population density, population reproduction
rate and loss in germination percentage were 2868.08 individual, 77.61
individual/month and 65.82%, while ACSAD was the least susceptible one and
the values were 1004.91 individual, 23.88 individual/month and 47.49%
respectively. Also infestation level and storage period had a significant effect on
the population density, population reproduction rate and loss in germination
percentage.
Tissue culture process of date palm propagation via bud proliferation is
fully described. Adventitious plantlets were obtained from shoot tips. axillary
buds and the bottom of young leaves of five date palm cultivars (Sefri, Zahdi,
Rizzez, Khalas
and Hillaly).
