Pre-weanling Mice
Pre-weanling Mice - Related Videos
15:00
Fundamentals of Breeding and Weaning
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Millions of mice and rats are bred for use in biomedical research each year. Worldwide, there are several large commercial breeding facilities that supply mice to research laboratories, but many facilities also choose to breed mice and rats in-house to reduce costs and increase research options. When breeding in the animal facility, researchers are able to manipulate the genetics of the...
04:16
Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide
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2026
Respiratory muscle weakness is highly prevalent in patients weaning from mechanical ventilation. Resistive inspiratory muscle training (IMT) can improve inspiratory strength and potentially weaning outcomes. This protocol provides a structured approach to offer IMT to selected patients based on the best available knowledge, facilitating its wider application in critical care.
04:06
Identification of Pre-weanling 7-Day-Old Mice with Pinna Edge Biopsies
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2025
The protocol presents a novel stepwise approach to producing a pinna-edge biopsy (PEB) in post-natal day (PND) 7 mice for the purpose of identification and simultaneous genotyping.
13:36
Transnuclear Mice with Pre-defined T Cell Receptor Specificities Against Toxoplasma gondii Obtained Via SCNT
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Cited by 10 •
2010
We demonstrate here that epigenetic reprogramming via Somatic Cell Nuclear Transfer (SCNT) can be used as a tool to generate mouse models with pre-defined T cell receptor (TCR) specificities. These transnuclear mice express the corresponding TCR from their endogenous locus under the control of the endogenous promoter.
02:01
pre-mRNA Processing
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2019
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA. Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
FAQs
Maternal care is part of the biological context of this stage, not merely a housing consideration. Milk, warmth, and maternal behavior can influence how pups develop while their nervous, immune, metabolic, and musculoskeletal systems are still maturing. Consequently, an observed response may reflect both the experimental factor and the pup’s interactions with the dam.
Responses can differ substantially across this period because several physiological systems are undergoing active maturation. Nervous, immune, metabolic, and musculoskeletal development may change how pups react to drugs, environmental factors, or other experimental manipulations. Researchers therefore need to interpret findings in relation to the animal’s developmental stage rather than assuming results will match those from adults.
Maternal effects can influence the conditions under which an early-life exposure occurs and may contribute to later outcomes. Because pups depend on the dam for nutrition, warmth, and care, these factors can interact with exposure-related effects during development. Accounting for maternal context helps researchers interpret whether findings reflect the tested factor, developmental biology, or both.
Age within the pre-weaning period can affect experimental interpretation because the animals are progressing toward independent feeding while multiple body systems mature. A manipulation performed at one developmental point may not produce the same response at another. Recording and controlling developmental stage strengthens comparisons and helps connect experimental findings to specific phases of early mammalian development.
Housing, handling, nutrition, maternal care, and developmental stage all require careful attention. These pups remain dependent on the dam for essential support, so changes in their surroundings or care can influence physiological responses. Consistent management improves experimental reliability and reduces the risk that differences in husbandry will be mistaken for effects of the research intervention.
They are useful for investigating early mammalian development, maternal effects, early-life exposure to drugs or environmental factors, and the origins of later disease. Their developmental state allows researchers to examine how immature nervous, immune, metabolic, and musculoskeletal systems respond during a period when dependence on maternal support is changing.
Physiological responses in pre-weanling mice may differ substantially from those in weaned or adult animals because development is still underway and maternal dependence remains important. Findings from this stage should therefore be interpreted as age-specific evidence. Comparisons with older animals can help identify which effects are associated with early development rather than general mammalian responses.