Fetal Sheep Instrumentation
Fetal Sheep Instrumentation - Related Videos
14:40
Instrumentation of Near-term Fetal Sheep for Multivariate Chronic Non-anesthetized Recordings
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Cited by 17 •
2015
The chronically instrumented non-anesthetized fetal sheep model is used to study human fetal development in health and disease, because it permits surgical placement and maintenance of catheters and electrodes, repetitive blood sampling, substance injection, recording of bioelectrical activity, and in vivo imaging. We describe the procedures required to establish this model.
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.
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.
01:08
Cloning of Dolly the Sheep
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2025
The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual, the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter telomeres than other...
FAQs
Preserving the placental connection is essential because it allows measurements to reflect fetal development within the ongoing pregnancy rather than an isolated preparation. The fetus remains connected to maternal and placental influences while instruments record physiological changes. This arrangement is particularly useful for examining how placental function, fetal growth, and maturation interact over time.
The instrument selected depends on the physiological question. Catheters provide access for fetal or maternal blood sampling, electrodes can record electrical activity, and sensors may monitor conditions in the fetal or amniotic environment. Placing devices in blood vessels, the amniotic cavity, or maternal tissues enables investigators to examine different physiological compartments during development.
Longitudinal measurement is a major advantage because repeated sampling and continuous recording can follow changing physiology across fetal maturation. Rather than relying only on a single endpoint, investigators can observe cardiovascular, respiratory, endocrine, or neural activity as development proceeds. This time-resolved view helps distinguish transient responses from progressive developmental changes.
Fetal sheep instrumentation can expose developmental responses to defined physiological conditions, including hypoxia, while recording fetal activity. Measurements may show how cardiovascular, respiratory, endocrine, or neural systems respond before birth. In developmental biology, these observations connect an environmental challenge with organ-system maturation and with the fetus’s preparation for transition to extrauterine life.
A typical preparation uses aseptic surgery to place the planned catheters, electrodes, or sensors in selected fetal, amniotic, or maternal locations. Investigators then maintain the placental connection and ongoing pregnancy while collecting samples or recording signals. The resulting setup supports controlled, repeated observations of fetal physiology rather than a single measurement made after pregnancy has ended.
Researchers can use the preparation to investigate maturation of fetal organ systems, placental influences on growth, and physiological responses associated with pregnancy complications. It also supports study of cardiovascular, respiratory, endocrine, and neural development before birth. These outcomes can clarify how prenatal conditions shape fetal physiology and the transition to life outside the uterus.