Development of Assisted Reproduction Technologies in Small Ruminants

A special issue of Veterinary Sciences (ISSN 2306-7381). This special issue belongs to the section "Veterinary Reproduction and Obstetrics".

Deadline for manuscript submissions: closed (16 June 2023) | Viewed by 4916

Special Issue Editors

Faculdade de Veterinária, Universidade Estadual do Ceará, Fortaleza 60714-903, Brazil
Interests: embryo production, transgenesis and cloning
Faculdade de Veterinária, Universidade Estadual do Ceará, Fortaleza 60714-903, Brazil
Interests: ruminants; endocrine–metabolic control in reproduction; follicular development; ovary; fertilization; early embryonic development; fetal development; epigenetic control in reproduction
Special Issues, Collections and Topics in MDPI journals
Faculdade de Veterinária, Universidade Federal Fluminense, Rio de Janeiro 24220-900, Brazil
Interests: estrus synchronization; in vitro embryo production; small ruminants

Special Issue Information

Dear Colleagues,

Assisted reproduction technologies are one of the main current topics covered in animal reproduction. In recent decades, important contributions have been made in this field based on advances in molecular biology, proteomics, and other biotechnologies. However, there are many aspects that need to be further studied. Regarding small domestic ruminants, ovine and caprine productions are a source of meat, milk, fur, and wool all over the world. In this sense, these species have become of great interest to breeders. For this reason, research on assisted reproduction technologies is of particular interest to improve productive and reproductive indices.

Thus, the open access journal Veterinary Sciences (ISSN: 2306-7381, Impact Factor: 2.304) is currently running a Special Issue entitled “Development of Assisted Reproduction Technologies in Small Ruminants”. Dr. Davide Rondina, Joanna Souza-Fabjan, and I are serving as Guest Editors for this Special Issue. We invite you to contribute a feature paper to this issue.

Topics of special interest are those related to assisted reproduction: estrus synchronization, superovulation, cryopreservation (semen, oocytes, and embryos), in vitro embryo production, transgenesis, cloning and related topics such as proteomics, gene expression, and others.

Dr. Vicente José De Figueirêdo Freitas
Prof. Dr. Davide Rondina
Prof. Dr. Joanna Maria Gonçalves de Souza-Fabjan
Guest Editors

Manuscript Submission Information

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Keywords

  • reproduction
  • sheep
  • goats
  • artificial insemination
  • embryo transfer
  • cloning

Published Papers (2 papers)

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Research

14 pages, 1166 KiB  
Article
Stimulation of Estrus and Ovulation by Resynchronization in Kangal Sheep during Early Anestrus
by Abdurrahman Takci and Dursun Ali Dinc
Vet. Sci. 2023, 10(8), 499; https://doi.org/10.3390/vetsci10080499 - 02 Aug 2023
Viewed by 1009
Abstract
A total of 100 Kangal sheep were divided into four groups with the aim of investigating the effectiveness of resynchronization during anestrus for the first time in the literature. The groups were then divided into two further subgroups, namely the resynchronization subgroup group [...] Read more.
A total of 100 Kangal sheep were divided into four groups with the aim of investigating the effectiveness of resynchronization during anestrus for the first time in the literature. The groups were then divided into two further subgroups, namely the resynchronization subgroup group (hCG+resynch) and group (resynch)) and the no resynchronization subgroup (Group (hCG) and group (control)). All the groups started with progesterone-containing sponge insertion on Day 7. The sponge was removed after 7 days (on Day 0), and 600 IU eCG + 131.5 µg PGF2α was injected. The animals in group (hCG+resynch) and group (hCG) received hCG injection at the time of sponge administration. Accordingly, four different groups were established, i.e., resynchronization + hCG administration group (hCG+resynch); n:25), no resynchronization + hCG administration (group (hCG); n:25), resynchronization + no hCG administration (group (resynch); n:25), and no resynchronization + no hCG administration (Group (control); n:25). Estrus rates at the first application in group (hCG+resynch), group (hCG), group (resynch), and group (control) groups were 76%, 88%, 96%, and 76%, respectively, and pregnancy rates were 52%, 64%, 72%, and 60%, respectively; there were no intergroup statistical differences in the two parameters above. It was concluded that resynchronization performed with two consecutive stimulations during anestrus could help save time and provide a pregnancy rate at a level that can provide economic returns. Full article
(This article belongs to the Special Issue Development of Assisted Reproduction Technologies in Small Ruminants)
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13 pages, 5004 KiB  
Article
Ultrasound Diagnosis in Small Ruminants: Occurrence and Description of Genital Pathologies
by Mário Felipe Alvarez Balaro, Isabel Oliveira Cosentino, Ana Clara Sarzedas Ribeiro and Felipe Zandonadi Brandão
Vet. Sci. 2022, 9(11), 599; https://doi.org/10.3390/vetsci9110599 - 28 Oct 2022
Cited by 4 | Viewed by 3350
Abstract
This study reports the occurrence and appearance of various reproductive tract pathologies of small ruminants diagnosed using ultrasound. An eight-year retrospective study of collected ultrasound data was carried out in Rio de Janeiro State, Brazil from September 2012 to July 2020. A total [...] Read more.
This study reports the occurrence and appearance of various reproductive tract pathologies of small ruminants diagnosed using ultrasound. An eight-year retrospective study of collected ultrasound data was carried out in Rio de Janeiro State, Brazil from September 2012 to July 2020. A total of 3463 animals from 16 sheep flocks and 10 dairy goat flocks, raised under extensive and intensive management systems, respectively, were used in the study. All animals were submitted to an ultrasound examination of their reproductive tract. Data were analyzed using Fisher’s exact test (p < 0.05), to compare disorder frequencies within and between species. Ewes (4.14%) had fewer reproductive disorders than does (8.98%), while rams (43.63%) and bucks (56.25%) presented no significant differences. Hydrometra was the most frequent finding in does, represented by 50.98% of cases; while, in ewes, recent fetal loss (22.85%) and cystic endometrial hyperplasia (20.00%) were the most frequent. In bucks, the findings showed no clear differences; while, for rams, the most frequent finding was testicular microlithiasis (75.00%). Ultrasonography offers clinically useful information about the reproductive tract via the images it provides; knowledge of which makes it possible to improve the diagnosis, therapy, and prognosis of genital pathologies. Full article
(This article belongs to the Special Issue Development of Assisted Reproduction Technologies in Small Ruminants)
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