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Leptin in bovine colostrum and milk
1Department of Veterinary Sciences and Technology for Food Safety, Veterinary Faculty, University of Milan, Italy. luciano.pinotti@unimi.it
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|March 9, 2006
Summary
Bovine colostrum contains significantly more leptin than mature milk, with levels correlating to fat and choline phospholipids. Leptin decreases in milk and plasma during early lactation.
Area of Science:
- Animal Science
- Biochemistry
- Endocrinology
Background:
- Leptin, a key metabolic hormone, plays a role in regulating energy balance and appetite.
- Understanding leptin dynamics in bovine dairy products is crucial for their nutritional and functional applications.
Purpose of the Study:
- To quantify leptin concentrations in bovine colostrum, milk, and plasma during the first month of lactation.
- To explore the relationship between milk components (fat, choline phospholipid) and leptin levels in dairy cows.
Main Methods:
- Leptin levels were measured using a multi-species leptin radioimmunoassay (RIA) kit.
- Colostrum and milk samples were collected from five multiparous dairy cows on days 0, 10, 20, and 30 postpartum.
- Milk yield and composition analyses were performed concurrently.
Main Results:
- Leptin concentration was 56% lower in mature milk compared to colostrum (p < 0.001).
- Daily leptin secretion into mature milk was lower than colostrum (p = 0.09), despite increased milk production.
- Leptin levels in both colostrum and milk showed significant positive correlations with fat and choline phospholipid content (p < 0.001 and p < 0.05, respectively).
- Plasma and milk leptin decreased during the first month of lactation, with colostrum exhibiting the highest concentrations.
Conclusions:
- Leptin is abundant in bovine colostrum and present in lower, more variable amounts in mature milk.
- Leptin content in milk is associated with fat and choline phospholipid levels.
- Skimmed milk is likely to have reduced leptin content.
- Findings inform the utilization of untreated milk and colostrum in functional food products.
