| Titles |
|
English :
|
Lambing and embryonic mortuary rates in Awassi and Barki ewes and their crosses throughout three different mating seasons in the west- coastal region of Egypt
|
|
Arabic :
|
معدلات الولادات و فقد الاجنة في نعاج العواسى و البرقى و خليطهما خلال ثلاث مواسم تلقيح متتالية في منطقة الساحل الشمالى الغربى بجمهورية مصر العربية
|
|
| Abstract |
This study was conducted to determine whether early diagnosis of pregnancy with ultrasonography and reintroduction of rams to non-pregnant ewes for additional two estrous cycles would increase pregnancy rate and increase lambing crop Fertile rams were introduced to a total of 335 Awassi and Barki ewes and their crosses for 30 days during three consecutive mating seasons: spring, autumn, and winter. Transrectal ultrasound diagnosis of pregnancy was carried out after 30 days of rams' introduction to detect pregnant ewes and to reintroduce rams for additional 30 days to the non-pregnant ones. In spring, Barki ewes had greater (P<0.01) lambing rates than Awassi ewes (61.4 vs. 16.7%). In autumn all breeds had comparable lambing rates. In winter, Barki ewes had greater lambing rate (61.4%) compared to Awassi ewes (16.7%) and their cross ewes (26.9%). Embryonic mortality rates for Awassi ewes (45.5%) in spring were higher than Bark; ewes (l7.6%). In autumn all ewes had similar rates of embryonic mortality with average rate of 23.8% for. The whole three breeds In winter, the cross ewes had the highest rate of embryonic mortality (69.6%) compared to both Barki(30%) and Awassi ewes (50%) Awassi ewes had the highest rate of behavioral and ovarian anestrus in spring (63.3%) and winter (66. 7%) compared to (10.8%) in autumn. Barki ewes had the highest rate of anestrus in spring (25.7%) compared to 11.8% in autumn and 12.3% in winter. Furthermore, the percentage of ewes that conceived after matings during the first estrous cycle after rams introduction as determined by transrectal ultrasonography of Uterine contents on day 30 was greatest for Barki ewes (66.2%) in winter and for cross ewes (65.4%) in autumn. Season of mating had a significant effect on urea nitrogen (UN) concentration in sera in ewes under study, however breeds had no significant effect but Awassi tended to have more serum UN than Barki and cross ewes. More importantly, reproductive status had significant effect on serum UN concentrations.
Ewes that last their pregnancy during the course of the experiment as well as the anestrus ewes showed greater urea concentrations in their sera compared to the quick response ewes that conceived and maintained pregnancy to term. Progesterone concentration determined on days 30, 60 and 90 after rams' introduction differed in the ewes that were considered anestrus, quick response ewes, and ewes with embryonic mortality (2.0, 5.3, and 4.3 ng/ml, respectively).
Key words: ultrasound, lambing rate, embryonic mortality, sheep, urea, progesterone
|
| Publication year |
2007
|
| Pages |
15-24
|
| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
|
| Availability number |
|
| Organization Name |
Animal Production Research Institute (APRI)
|
| City |
الاسكندرية
|
| serial title |
Alexandria Journal Agricultural Research
|
| Author(s) from ARC |
|
| External authors (outside ARC) |
سمير زكى الزرقونى
جامعةا لاسكندرية
عادل نور الدين محمد
جامعة الاسكندرية
جمال الدين عبد الرحيم حسن
جامعة الاسكندرية
|
| Agris Categories |
Animal physiology - Reproduction
|
AGROVOC
TERMS |
Ewes.
Foetal death.
Mortality.
Progesterone.
Rams.
Reproductive performance.
Sheep.
Ultrasonics.
Urea.
|
| Publication Type |
Journal
|