ReviewTropical animal health and production2021
Approaches of estrous synchronization in sheep: developments during the last two decades: a review.
Review in Tropical animal health and production, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
19 citing papers in PubMed, 49 citations in OpenAlex.
- Control of Estrus in Sheep: Protocol Architectures, Seasonal Effects, and Breed-Specific Reproductive Performance.Animals : an open access journal from MDPI · 2026Review
- Reproductive Physiology, Genetic Architecture, and Management of Duolang Sheep Under Arid-Zone Production Systems: A Review.International journal of molecular sciences · 2026Review
- The Effect of Photoperiod on the Profile of Prolactin, Leptin, Insulin and the Content of Bioactive Substances in Sheep Milk During the Rearing Period of Lambs.Animals : an open access journal from MDPI · 2026Article
- Hormone guided estrus synchronization using progesterone sponge and PMSG in goats: a cost-effective optimization strategy.Frontiers in veterinary science · 2026Article
- The Effect of Environment and Husbandry Practices on Sheep Welfare.Animals : an open access journal from MDPI · 2025Review
- Optimizing pregnant mare serum gonadotropin dosage for reproductive efficiency and lamb survival in Dorper × Assaf ewes during the non-breeding season.Veterinary world · 2025Article
- Off-Season Reproductive Performance of Tsurcana Ewes Under Five Estrous Induction Protocols with Different Hormonal Profiles.Biology · 2025Article
- Glycerol Supplementation During Oestrus Synchronisation With Fluorogestone Acetate Affects Follicular Proliferation, Maturation and Apoptosis of Granulosa Cells in Pelibuey Ewes.Reproduction in domestic animals = Zuchthygiene · 2025Article
- Editorial: Reproductive biotechnologies and challenges in their application.Frontiers in veterinary science · 2025Article
- Effects of exogenous GnRH administration at insemination on pregnancy rates of estrus-synchronized seven ewe populations during the breeding season.Animal reproduction · 2025Article
- Effects of human chorionic gonadotropin on reproductive outcomes in estrus-synchronized ewes subjected to two different insemination methods.Veterinary research forum : an international quarterly journal · 2025Article
- Exploring Endogenous and Exogenous Factors for Successful Artificial Insemination in Sheep: A Global Overview.Veterinary sciences · 2024Review
- Evaluation of the efficiency of estrus synchronization protocols combined with natural service and ultrasonography on ewe reproductive performance during non-breeding season.Iranian journal of veterinary research · 2024Article
- Metabolomics analysis of the effect of GnRH on the pregnancy rate of ewes with estrus synchronization scheme based on progesterone.Frontiers in veterinary science · 2024Article
- Stimulation of Estrus and Ovulation by Resynchronization in Kangal Sheep during Early Anestrus.Veterinary sciences · 2023Article
- Effect of progesterone infused controlled internal drug releasing (CIDR) device and timing of gonadotropin stimulation using P.G. 600 on reproductive success in ewes bred out of season.Translational animal science · 2023Article
- Impact of oestrus synchronization devices on ewes vaginal microbiota and artificial insemination outcome.Frontiers in microbiology · 2023Article
- Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation.Veterinary sciences · 2022Review
- Intravaginal Progesterone Application as an Efficient and Reproducible Tool for Synchronizing the Mouse Estrous Cycle.Reproductive medicine and biologyArticle
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The objective of the current review was to summarize the protocols used for estrous synchronization in ewes during the last two decades. Progesterone (P4) is a major hormone used in most protocols. P4 in the form of a controlled internal drug releasing (CIDR) device, medroxyprogesterone acetate (MAP), and fluorogestone acetates (FGA) has been used for estrous synchronization. Also, gonadotropins such as equine chorionic gonadotropin (eCG) and gonadotropin-releasing hormone (GnRH) are often administered at the end of P4-based protocols to improve fertility. Moreover, the administration of prostaglandins (PG) and ram effects have been used for estrus induction and synchronization of ewes. The findings of previous studies indicate that the outcome of administering various synthetics P4 analogues (CIDR, MAP, and FGA) in ewes is comparable in terms of estrous synchronization/induction. The supplementation of P4-based protocols with eCG, however, improves the estrus response and pregnancy rate during breeding and non-breeding season. On the other hand, PG is effective for successful estrous synchronization during the breeding season only. Often, two injections of PG are administered either 11 or 14 days apart along with P4-based protocols to lyse ovine corpus luteum (CL) when it is receptive to PG i.e., 3 days post-ovulation. Alternatively, the "ram effect" has been shown to improve the efficacy of P4-based protocols and can be used as an alternative to eCG in ewes. The current review describes the methods of synchronization and their outcomes during breeding and a non-breeding season in ewes.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.