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STUDIES ON MILK SECRETION : THE INFLUENCE OF INANITION
1Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J., and the Maine Agricultural Experiment Station, Orono, Maine.
Starvation significantly alters cow milk production and composition. Key changes include reduced milk yield, increased total solids (fat, ash), and decreased lactose, linked to blood dextrose levels.
Area of Science:
- Animal Science
- Biochemistry
- Dairy Science
Background:
- Understanding the metabolic impact of nutritional deficiencies on milk production is crucial for dairy farming.
- Previous research has explored various factors influencing milk composition, but the specific effects of complete starvation require further elucidation.
Purpose of the Study:
- To investigate the effects of complete starvation on milk yield and composition in cows.
- To determine the relationship between blood composition and milk composition during starvation.
Main Methods:
- Cows were subjected to periods of starvation with ad libitum water access.
- Milk yield and composition (total solids, fat, ash, protein, lactose) were analyzed at various time points.
- Blood composition, specifically dextrose levels, was monitored concurrently.
Main Results:
- Milk yield decreased significantly during starvation.
- Milk total solids increased, primarily due to higher fat and ash percentages, with a slight protein increase.
- Lactose content in milk markedly decreased, correlating with reduced blood dextrose levels.
Conclusions:
- Milk lactose is synthesized from blood dextrose, establishing a direct precursor-product relationship.
- Changes in milk composition during starvation are a direct reflection of concurrent alterations in blood chemistry.
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