Induction of synchronized oestrous and early pregnancy diagnosis in Syrian Awassi ewes, outside the breeding season

Zarkawi, M.; Al-Merestani, M.R; Wardeh, M.F.

doi:10.1016/s0921-4488(99)00007-3

Cited by 40 publications

(35 citation statements)

References 7 publications

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“…Laparoscopic examination was performed to assess the ovaries and the status of the ovarian response to the hormonal treatments inside and outside the breeding season. This reported work has helped to elucidate some other reproductive parameters in Syrian Awassi ewes as a continuation to previous studies (Zarkawi et al 1999;Zarkawi 2000Zarkawi , 2004.…”

Section: Resultssupporting

confidence: 67%

Ovarian status in fat-tailed Syrian Awassi ewes during different reproductive stages and hormonal treatments monitored by laparoscopy and progesterone concentrations

Zarkawi

Soukouti

2012

Journal of Applied Animal Research

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Section: Resultssupporting

confidence: 67%

Ovarian status in fat-tailed Syrian Awassi ewes during different reproductive stages and hormonal treatments monitored by laparoscopy and progesterone concentrations

Zarkawi

Soukouti

2012

Journal of Applied Animal Research

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“…The reproductive paremeters, calculated following treatment, were oestrus response rate (number of ewes showing oestrus behaviours/number of ewes receiving intravaginal sponge and PMSG ×100), elapsed time for oestrus behaviour (time from removal of sponge to first oestrus behaviour), oestrus duration (time from first oestrus sings to end of oestrus behaviours for standing oestrus), pregnancy rate (number of pregnant ewes/number of mated/mounted ewes ×100), gestation length (time from mated to birth), lambing rate (number of lambing ewes/number of mated ewes ×100) and litter size (number of total lambs/number of lambing ewes in the group ×100) (Zarkawi et al 1999;Karaca et al 2009;Zonturlu et al 2011).…”

Section: Determination Of Reproductive Parametersmentioning

confidence: 99%

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Zonturlu

Kaçar

Kaya

et al. 2018

Journal of Applied Animal Research

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The aim of this study was to investigate the effect of single or double Gonadotropin releasing hormone (GnRH) injections at the time of mating and following on day 9 on pregnancy rates and litter size in ewes. Oestrus was synchronized in 130 adult ewes using intravaginal sponges containing 20 mg of fluorogestone acetate for 14 days. All ewes received 10 IU/kg of pregnant mare serum gonadotropin (PMSG) at the sponge withdrawal. Then animals were divided into three groups. Ewes in group 1 (G1; Control, n = 68) received 1 ml placebo injection. In group 2 (G2; n = 30), ewes in oestrus were treated with 1 ml GnRH (4 μg/ml) at the time of mating. In group 3 (G3; n = 32), ewes were injected 1 ml GnRH not only at the time of mating but also on day 9 post-mating. There was significantly higher in duration of oestrus G1 compared with the G2 and G3. Pregnancy rate was found to be higher in G3 (96.0%) than in G1 (72.7%) and G2 (83.3%). The litter size was significantly higher for G3 (1.26 ± 0.14) in comparison with the G1 (1.18 ± 0.07) and G2 (1.22 ± 0.10). In conclusion, Post-mating GnRH injection enhanced the pregnancy rate and litter size, because of its beneficial effects on embriyo viability by increasing luteal formations. ARTICLE HISTORY

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“…The accuracy of both type of assays for detecting pregnancy was high, while it was low for diagnosing non-pregnancy (Amezcua-Moreno 1988;Susmel and Piasentier 1992;Gvozdic and Ivkov 1994;see Table 3). On the other hand, 100% accuracy for detecting non-pregnant ewes was achieved by using EIA at Day 16 (McPhee and Tiberghien 1987) and Day 21 after mating (Zarkawi 1997) or by using RIA at Days 17 to 18 (Zarkawi et al 1999; see Table 3). Early embryonic death, uterine and/or ovarian pathology may be the source of the false positive cases.…”

Section: Rectal Abdominal Palpationmentioning

confidence: 99%

Pregnancy Dagnosis in Sheep: Review of the Most Practical Methods

Karen¹,

Kovács²,

Beckers³

et al. 2001

Acta Vet. Brno

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Various practical methods have been used for pregnancy diagnosis in sheep. Both pregnancy and fetal numbers are accurately diagnosed by using radiography after day 70 of gestation. Rectal abdominal technique detects pregnancy with an accuracy of 66 to 100% from d 49 to 109 of gestation, however, it has a low (17 to 57%) accuracy for determining multiple fetuses. Progesterone assays have a high sensitivity (88% to 100%) and a low specificity (60% to 72%) at d 16 to 18. Estrone sulphate assay accurately detects pregnant ewe at d 30 to 35. Ovine pregnancy specific protein B (PSPB) assay accurately (100%) detects pregnancy from d 26 after breeding onwards. The accuracy of progesterone, estrone sulphate and oPSPB assays for determining fetal numbers is relatively low. A-mode and Doppler ultrasonic techniques accurately detect pregnancy during the second half of gestation. Fetal numbers cannot be determined by A-mode ultrasound, while the Doppler technique needs experience to achieve high accuracy. Transrectal B-mode, real time ultrasonography identifies the embryonic vesicles as early as d 12.8 after mating, but the sensitivity of the technique for pregnancy is very low (12%) earlier than 25 d after mating. Transabdominal B-mode ultrasonography achieved high accuracy for pregnancy diagnosis (94% to 100%) and the determination of fetal numbers (92% to 99%) on d 29 to 106 of gestation. Realtime, B-mode ultrasonography appears to be the most practical and accurate method for diagnosing pregnancy and determining fetal numbers in sheep.

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Induction of synchronized oestrous and early pregnancy diagnosis in Syrian Awassi ewes, outside the breeding season

Cited by 40 publications

References 7 publications

Ovarian status in fat-tailed Syrian Awassi ewes during different reproductive stages and hormonal treatments monitored by laparoscopy and progesterone concentrations

Ovarian status in fat-tailed Syrian Awassi ewes during different reproductive stages and hormonal treatments monitored by laparoscopy and progesterone concentrations

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Pregnancy Dagnosis in Sheep: Review of the Most Practical Methods

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