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An Efficient Single-Person Technique for Milk Sampling from Laboratory Mice

An Efficient Single-Person Technique for Milk Sampling from Laboratory Mice

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Milk ejection in mice LG/J x SM/J.

Carolina P Góes¹, Bruno Sauce, Andrea C Peripato

¹Department of Genetics and Evolution, Biological Science and Health Center, Federal University of Sao Carlos, Via Washington Luiz Km 235, Sao Carlos, SP, 13565-905, Brazil.

Mammalian Genome : Official Journal of the International Mammalian Genome Society

|October 12, 2012

Summary

Milk ejection (ME) on day 1 is vital for pup survival and growth. Early milk deficiency impacts later metabolism, leading to heavier, fatter pups at weaning due to complex genetic factors influencing maternal care.

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Area of Science:

Genetics
Developmental Biology
Animal Science

Background:

Mammalian milk provision is essential for offspring survival and development.
Milk deficiency can lead to metabolic disorders like obesity later in life.
Understanding milk ejection (ME) is key to maternal care and offspring outcomes.

Purpose of the Study:

Investigate milk ejection (ME) on day 1 (D1) in F(2) mouse females from LG/J and SM/J strains.
Analyze the association between D1 ME absence and F(3) pup survival and growth.
Identify genetic factors, including QTLs and epistasis, influencing ME variation.

Main Methods:

Cross-breeding LG/J and SM/J inbred mice to generate F(2) and F(3) generations.
Assessed pup stomach content at D1 to determine milk absence.

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Performed quantitative trait locus (QTL) analysis for ME in F(2) females.

Main Results:

Absence of milk at D1 significantly impacts pup survival and early growth (p < 0.001).
Surviving pups, primarily males, show increased weight and fat deposition at weaning (p < 0.001, p < 0.01).
ME exhibits complex genetic architecture with one major QTL (8% variation) and significant epistatic interactions (19% total variation).

Conclusions:

D1 milk absence has profound effects on offspring survival, growth, and later metabolism.
Genetic background and epistatic interactions play a crucial role in modulating milk ejection.
Understanding ME variation is vital for deciphering the complexities of maternal care and mother/offspring relationships.