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Register a new userدراسة توقيت الشبق عند نعاج العواسي أثناء وخارج موسم الشبق باستخدام المعاملة الهرمونية
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جامعة الفرات رسالة ماجستير
Publication date
2011
fields
Agricultural Engineering
and research's language is
العربية
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أجريت تجربتان خارج وضمن موسم الشبق على نعاج العواس تحت ظروف التربية المسرحية بمحافظة دير الزور بهدف اختبار المعاملات الهرمونية المختلفة في نتائج الكفاءة التناسلية
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لبادة و ف 1986 تنظيم الشياع وزيادة نسبة التوائم في أغنام العواسي دراسات 13 (2)
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Three hundreds- Awassi yearlings, ١٨-١٩ months old, ٤٠ ± ١ kg weight,
٢,٥-٣ months post first lambing, were used to study the efficiency of hormonal
treatment in synchronizing estrus and increasing lambing rate with a program
of having two lambs p
er year. Ewes were randomly and equally divided into
three groups.
Twelve growing Shami heifers available in Dier-Al-Hajar Station for
improving Shami Cattle during 2005-2007 weighing 250±11 kg and 400±21
days old were used to monitore the growth of dynamic of ovarian follicles (daily
numbers, size, length and nu
mber of waves, rate of growth and regression) and
characteristics of estrus cycle (length, time of dominancy, diameter of Graffian
follicle and estrus and ovulatory times), length of corpus luteum (CL) during
the estrous cycle. Heifers were maintained under uniform conditions and fed
according to their daily growth. Transrectal Ultrasound Echo System (7.5 MHz
probe) was used to study the ovarian structures and to monitor the daily
development and regression of ovarian follicles, the formation and regression of
corpus luteum in the left and right ovaries during the estrus cycle. Results
indicated that the growth turnover of ovarian follicles was observed and
developed in a wave pattern in all Shami heifers and no significant differences
in the number and sizes of ovarian follicles were found between right and left
ovaries. A cohort of 5 to 7 small follicles with a diameter 2-5 mm developed
together and one of them was selected to continue growing and becomes
dominant and later on being regressed or ovulated during the estrus cycle. One
to five follicular waves were observed per cycle and each wave was
characterized by the development of one large (dominant) follicle and a
variable number of smaller follicles. The estrus cycle with one follicular wave
occurred only in heifers exhibited the first post pubertal cycles with an average
length equaled to 8.67±0.33 days. Frequency of estrus cycle according to the
number of follicular waves was 8.4, 25.3, 44.2, 20 and 2.1% in cycles having 1,
2, 3, 4 and 5 follicular waves, respectively. Furthermore , the length of estrus
cycle was also related to the number of follicular waves and it was 21.87±0.62,
22.44±0.74, 26.4±0.72, 26.50±3.50 days in cycles having 2, 3, 4 and 5 follicular
waves, respectively with significant differences (P < 0.05) in cycles with 2 or 3
vs. 4 and/or 5 waves. The functional duration of CL was extended to 9, 12 and
15 days in a short (17-19 days), intermediate (20-24 days) and long estrus cycle
(≥ 25 days). The maximum diameter of dominant follicles in ovulatory waves
was significantly larger (P < 0.05) than that of dominant follicles in nonovulatory
waves. In conclusion, this study showed that the development of
ovarian follicles in Shami heifers occurs in waves and the most common pattern
is three waves per estrous cycle.
Fifteen Shami cows available in Dier-Al-Hajar Station for improving Shami
Cattle were used during 2009-2010 to evaluate the ovarian response of cows for
gonadotropin releasing hormone (GnRH) or human chorionic gonadotropin
(hCG) injected on day 5
of the estrus cycle during which dominant follicle is
growing in the first follicular wave. Animals were divided randomly into three
groups of five cows. Group 1 was left as a control and received no treatment
while Groups 2 and 3 received on day 5 of the estrous cycle a single i.m.
injection of 8 ?g of a GnRH agonist (Buserelin) and 3000 IU hCG, respectively.
Transrectal ovarian ultrasonography was performed daily to monitor ovarian
follicular dynamics and corpus luteum.
١٢٠ -Awassi ewes, ٣٦ ± ٢,٠ mos. old, ٤٢,٥ ± ٢,٥ kg. weight were used to
know the efficiency of artificial insemination (AI) in reproductive performance
of hormonal treated Awassi ewes in breeding season.
This research carried out to estimate the importance of use of 1-MCP in increasing
shelf life of Japanese persimmon ,var (Hachiya) , and maintaining fruits quality. The fruits
were treated with different concentrations of 1-MCP (0.5-1-1.5) ppm soon
ly after harvest
at 20Cᵒ during 24 h, then stored for 6 months at controlled conditions (2Cᵒ and 85% of
relative humidity). The samples were taken periodically (every month) to study the
changes in fruits composition during storage period.
The results showed that treatment with 1-MCP keeps fruits at higher degree of
firmness compared to the control, and decreased the loss in weight at storage period.The
treatment with 1-MCP decreased as well the changes in the fruits composition of Vitamine
c, total acidity (TA) compared to the control.
These results indicate that treatment with 1-MCP is effective in increasing shelf-life
of Japanese persimmon fruits var (Hachiya).
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