Method for evaluating milk production in mouse mammary gland

Area of Science:

• Mammalian physiology
• Reproductive biology
• Biochemistry

Background:

• Lactation is a vital mammalian function for offspring nourishment and the dairy industry.
• The precise molecular mechanisms governing lactation remain incompletely understood.
• A direct in vivo method to quantify milk quantity and quality in mice is needed for research.

Purpose of the Study:

• To establish and validate a novel technique for assessing lactation in vivo at the single mammary gland level.
• To enable the simultaneous evaluation of milk production rate and milk quality parameters.

Main Methods:

• A ductal cannulation technique was employed in mice to measure milk accumulation over 24 hours.
• Oxytocin supplementation was used to stimulate milk letdown and production.
• Milk quality was assessed by measuring creamatocrit, osmolarity, ion, lactose, and total protein concentrations.

Main Results:

• The method successfully estimated milk production rates at the individual mammary gland level.
• Comprehensive milk quality analyses were performed on collected samples.
• Intraductal administration of a hypertonic solution demonstrated an osmotically induced increase in milk yield.

Conclusions:

• The developed ductal cannulation technique provides a valuable tool for in vivo lactation studies in mice.
• This method facilitates detailed examination of lactation ability and underlying mechanisms.
• Further research utilizing this technique will enhance the understanding of mammalian lactation.