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Changes in milk composition during lactation in the tammar wallaby (Macropus eugenii)
Australian Journal of Biological Sciences
|March 1, 1980
Summary
Tammar wallaby milk composition changes significantly during lactation. Total solids and protein content increase, while sodium and potassium levels decrease, remaining isosmotic to plasma.
Area of Science:
- Comparative physiology
- Mammalian reproduction
- Marsupial biology
Background:
- Lactation in marsupials presents unique physiological challenges.
- Understanding milk composition is crucial for marsupial reproductive success.
Purpose of the Study:
- To characterize the dynamic changes in tammar wallaby (Macropus eugenii) milk composition throughout lactation.
- To analyze variations in total solids, protein, and electrolyte concentrations.
Main Methods:
- Collection of milk samples at regular intervals throughout lactation.
- Analysis of total solids, protein content, and sodium/potassium concentrations.
- Osmolality measurements compared to plasma.
Main Results:
- Total solids increased from 12% to 40% (w/w) by 36 weeks.
- Milk protein content rose from 4% to 13% (w/w) after 18 weeks.
- Sodium and potassium concentrations decreased significantly by 30 weeks, with milk remaining isosmotic to plasma.
Conclusions:
- Tammar wallaby milk undergoes substantial compositional shifts during development.
- These changes likely support the nutritional and physiological needs of the developing joey.
- Milk osmolality is maintained consistently relative to maternal plasma.