Sheep Oocytes
Sheep Oocytes - Related Videos
06:53
Vitrification of In Vitro Matured Oocytes Collected from Adult and Prepubertal Ovaries in Sheep
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Cited by 6 •
2021
The protocol aims at providing a standard method for the vitrification of adult and juvenile sheep oocytes. It includes all the steps from the preparation of the in vitro maturation media to the post-warming culture. Oocytes are vitrified at the MII stage using Cryotop to ensure the minimum essential volume.
13:42
Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep
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Cited by 23 •
2014
A short clinical examination protocol is presented to aid in the detection of classical and atypical scrapie in sheep and goats.
05:23
Establishment and Evaluation of a Sheep Model of Full-thickness Osteochondral Defect
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2026
Here, we present an integrated protocol for generating controlled osteochondral lesions in sheep knees to establish an experimental model suitable for bone and cartilage tissue regeneration studies. The protocol outlines a method for inducing a full-thickness osteochondral defect in the femoral condyle, utilizing techniques that minimize animal welfare impacts and variability in results.
13:18
Single Oocyte Bisulfite Mutagenesis
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Cited by 14 •
2012
Bisulfite mutagenesis is the gold standard for analyzing DNA methylation. Our modified protocol allows for DNA methylation analysis at the single-cell level and was specifically designed for individual oocytes. It can also be used for cleavage-stage embryos.
11:10
Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats
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Cited by 23 •
2011
Preimplantation embryos may be cryopreserved after placement into a hypertonic cryoprotective solution to cause cellular dehydration. After equilibration, ice crystal formation is induced in the solution surrounding the embryo. Further dehydration occurs as the embryo is slowly cooled to subzero temperatures before plunging into liquid nitrogen for storage.
FAQs
Nuclear maturation refers to the oocyte’s meiotic progression from the germinal vesicle stage toward metaphase II, whereas cytoplasmic maturation concerns changes that prepare the cell to support fertilization and subsequent development. These processes do not simply represent the same event, so researchers examine both when evaluating whether an oocyte has acquired developmental competence.
Growth within an ovarian follicle allows the oocyte to develop before it resumes meiosis. This follicular environment forms part of the developmental sequence that leads from an immature germ cell to a cell prepared for fertilization. Studying oocytes at different stages therefore helps developmental biologists connect follicular growth with later maturation and embryo-forming potential.
Culture conditions can influence both nuclear and cytoplasmic maturation, which in turn affects whether an oocyte can support fertilization and embryo development. Consequently, culture is not merely a holding step: it becomes an experimental variable. Comparing outcomes under different conditions helps researchers identify environments that preserve or improve developmental competence.
Reaching metaphase II indicates that meiotic maturation has advanced to the stage associated with preparation for fertilization. It provides a developmental reference point for experiments on oocyte quality, but it does not by itself describe every aspect of cytoplasmic readiness. Researchers therefore relate this nuclear stage to fertilization and subsequent embryo-development outcomes.
A typical study follows the oocyte from follicular growth through meiotic maturation, then examines fertilization and embryo development. Researchers may compare cells at the germinal vesicle stage with those reaching metaphase II, while varying culture conditions to test their effects. This sequence links cellular maturation with later developmental outcomes rather than treating each stage independently.
Experiments with sheep oocytes can connect the state of the original gamete with fertilization success and subsequent embryo development. By examining nuclear maturation, cytoplasmic maturation, culture conditions, and developmental progression together, researchers can investigate which features are associated with developmental competence. The resulting observations support broader studies of early mammalian development.
Sheep oocytes support research in assisted reproductive technologies, embryology, and developmental mechanisms relevant to livestock production. Their physiological similarities to other large domestic mammals also make them useful for comparative studies. This combination allows investigators to examine reproductive processes in a livestock model while generating context for understanding related mammalian systems.