Progestins Protocols For Inducing Estrus Synchronization In Breeding Season In Ossimi Sheep.

Ahmed, Ahmed; Yousef, Nasra Ahmed M.; Mahmoud, A I; Aref, Mohammed

doi:10.5455/ajvs.245197

Cited by 3 publications

(3 citation statements)

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“…3 Hours after the end of hormonal treatment. 4 Number of pregnant ewes/number of bred ewes × 100. 5 Number of ewes born a live lamb / number of bred ewes × 100.…”

Section: Progesterone Assaymentioning

confidence: 99%

“…(3) Low fecundity is the most common reproductive constraint in ewes, which causes great economic losses in the ovine industry. (4) Reproductive scientists endeavor to achieve precise intervention of reproductive hormones with corpus luteum (CL) and follicular development to produce an optimized hormonal milieu in which all animals ovulated and conceived. (5) In small ruminants, hormonal estrus synchronization is achieved either by reducing the length of the luteal phase with prostaglandin F 2α (PGF 2α ) or by extending it artificially with either exogenous progesterone (P4) or more potent progestagens.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of estrus response and subsequent fertility following estrus synchronization with six protocols in Ossimi ewes during the early summer season

Almadaly

Sahwan

et al. 2023

Vet Mex OA

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This study investigates the effect of estrus synchronization on the reproductive performance of Ossimi ewes during the early summer season to prove that they are cyclic throughout the year in subtropical climates. In June, 280 ewes were assigned to seven (n = 40) groups and received one of the following: 1) short-term progesterone (ST) P4 treated ewes received 20 mg P4 day after day for 6 days and 500 international unit (IU) equine chorionic gonadotropin (eCG) on day 6; 2) long-term P4 (LT) P4 treated ewes received 20 mg P4 day after day for 12 days and 500 IU eCG on day 12; 3) double prostaglandin (PG) F2α 7days apart and 500 IU eCG on day 7 (PGF2α-7d); 4) double PGF2α 14 days apart and 500 IU eCG on day 14 (PGF2α-14d); 5) traditional ovulation synchronization (T-Ovsynch; gonadotropin-releasing hormone (GnRH)-0 day; PGF2α-5 day and GnRH-7 day); 6) non-traditional ovulation synchronization (NT-Ovsynch; GnRH-0 day; PGF2α-7 day and GnRH-9 day); 7) control ewes received no treatment. There were significant differences among groups for estrus rate, the onset of estrus, pregnancy, and lambing rates as well as prolificacy and gestation period. The highest (90 %) estrus rate was recorded in (LT) P4, PGF2α-14d, and NT-Ovsynch protocols while the lambing rate was the maximum (100 %) in PGF2α-14d. Although all treatments had a positive effect on ewe fertility; long-term protocols particularly PGF2α-14d; are recommended to improve Ossimi ewe fertility during the early summer season.

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“…3 Hours after the end of hormonal treatment. 4 Number of pregnant ewes/number of bred ewes × 100. 5 Number of ewes born a live lamb / number of bred ewes × 100.…”

Section: Progesterone Assaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of estrus response and subsequent fertility following estrus synchronization with six protocols in Ossimi ewes during the early summer season

Almadaly

Sahwan

et al. 2023

Vet Mex OA

View full text Add to dashboard Cite

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“…The majority of ewe breeds differ in reproductive behavior depending on season changes, latitude/longitude, the length of the photoperiod and other factors. From this, several strategies have been used to control ovarian activity focusing on improving fertility of small ruminants (Cavalcanti, Brandão, Nogueira, & Fonseca, 2012), and prevent anestrus, the most common reproductive disorder of ewes, which causes great economic losses to the farmers due to lower fecundity (Ezzat, Ahmed, Elabdeen, & Sabry, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of different protocols for estrus synchronization on reproductive performance of Santa Inês ewes under Amazon environmental conditions

Silva

Oliveira

Silva

et al. 2020

Acta Sci. Anim. Sci.

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The objective of this study was to evaluate the effect of different hormonal protocols on the reproductive performance of Santa Inês ewes in Amazon environmental conditions. Twenty-two Santa Inês ewes between 3 and 4 years-old were distributed in a randomized block experimental design, where the treatments consisted of two protocols for estrus synchronization (short and long) with eleven animals each. Data on the occurrence of estrus were described for each protocol. Data of estrus, pregnancy, and prolificity were firstly subjected to ANOVA and a subsequent Tukey’s test. Results were considered significant at p ≤ 0.05. The short-term protocol presented an interesting successful rate, where above 70% ewes tested had estrus. The long-term protocol also achieved a high successful rate, where above 80% ewes tested had estrus. However, comparing the protocols, the long-term protocol presented better results of positive estrus and pregnancy rates in ewes. Thus, it can be concluded that both protocols presented satisfactory results regarding estrus manifestation, and prolificity (lambs produced per ewe). However, under Amazon environmental conditions, the long-term protocol presented better results regarding positive manifestation of estrus and pregnancy rate.

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The effect of different synchronization methods on fertility in Kıvırcık sheep in anoestrus period

Duymaz

Koyuncu

2021

Mediterranean Agricultural Sciences

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Bu araştırmada farklı senkronizasyon uygulamalarının koyunlarda döl verimi üzerine etkisi değerlendirilmiş ve 120 baş Kıvırcık koyun rastgele 4 uygulama ve 1 kontrol grubu olmak üzere 5 gruba ayrılmıştır. Ӏ. grup koyunlarda 18 mg melatonin içeren Regülin implantı özel aplikatörü ile kulak arkası deri altına uygulanmıştır. ӀӀ. gruba CIDR (Controlled Internal Drug Release) aparatı intravajinal olarak 12 süreyle yerleştirilmiş ve çıkarıldığı gün koyun başına 500 I.U. GKSH (Gebe Kısrak Serum Hormonu) kas içi olarak uygulanmıştır. ӀӀӀ. gruba 20 mg flugeston asetat emdirilmiş süngerler 14 gün süreyle intravajinal olarak yerleştirilmiş ve çıkarıldığı gün koyun başına 500 IU GKSH kas içi olarak uygulanmıştır. IV. gruba 11 gün ara ile iki doz halinde deri altına PGF2α (prostaglandin F2α) (3cc) enjeksiyonu uygulanmıştır. V. grupta ise herhangi bir uygulama yapılmamış kontrol grubu olarak değerlendirilmiştir. I.

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Progestins Protocols For Inducing Estrus Synchronization In Breeding Season In Ossimi Sheep.

Cited by 3 publications

References 0 publications

Comparison of estrus response and subsequent fertility following estrus synchronization with six protocols in Ossimi ewes during the early summer season

Comparison of estrus response and subsequent fertility following estrus synchronization with six protocols in Ossimi ewes during the early summer season

Effect of different protocols for estrus synchronization on reproductive performance of Santa Inês ewes under Amazon environmental conditions

The effect of different synchronization methods on fertility in Kıvırcık sheep in anoestrus period

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