<abstract xmlns="http://www.w3.org/1999/xhtml">
The study aimed to determine the concentration of energy-related hormones in cow’s milk and to consider them from a public health perspective. Fourteen Holstein cows were subjected to milk and blood sampling on the following days in lactation (DIL): 10, 30, 60, 90, 150, 180, 210, 250 and 280 to determine milk hormones, fat and protein content and blood biochemical parameters. For the same purpose, bulk-tank milk was sampled and samples of retail m ilk with 1.5% (CM1.5) and 3.2% (CM3.2) fat was purchased. Milk insulin-like growth factor-1 (IGF-1) values were significantly lower at 90, 150, 180, 210 and 250 and significantly higher at 10, 30 and 60 DIL than lactation average (LA). Milk insulin concentrations were significantly lower at 30, 60 and 90 and higher at 210, 250 and 280 DIL than LA. Free thyroxine (fT4) level in the milk was higher at 250 DIL, while milk free triiodothyronine (fT3) concentrations were lower at 30, 60, 90 and 280 DIL, and significantly higher at 10 and 180 DIL than respective LA. Milk cortisol levels were lower at 60 and 280 DIL than LA. All measured milk hormones were significantly lower in CM1.5 compared to CM3.2, bulk-tank milk and LA. An exception was the LA of IGF-1, which was significantly lower than the IGF-1 content in CM1.5. Blood biochemical parameters fluctuated evenly during lactation and were within the reference range. Hormone concentrations in cow’s milk fluctuate during lactation, giving milk an important role in the context of public health.
</abstract>

The study aimed to determine the concentration of energy-related hormones in cow’s milk and to consider them from a public health perspective. Fourteen Holstein cows were subjected to milk and blood sampling on the following days in lactation (DIL): 10, 30, 60, 90, 150, 180, 210, 250 and 280 to determine milk hormones, fat and protein content and blood biochemical parameters. For the same purpose, bulk-tank milk was sampled and samples of retail m ilk with 1.5% (CM1.5) and 3.2% (CM3.2) fat was purchased. Milk insulin-like growth factor-1 (IGF-1) values were significantly lower at 90, 150, 180, 210 and 250 and significantly higher at 10, 30 and 60 DIL than lactation average (LA). Milk insulin concentrations were significantly lower at 30, 60 and 90 and higher at 210, 250 and 280 DIL than LA. Free thyroxine (fT4) level in the milk was higher at 250 DIL, while milk free triiodothyronine (fT3) concentrations were lower at 30, 60, 90 and 280 DIL, and significantly higher at 10 and 180 DIL than respective LA. Milk cortisol levels were lower at 60 and 280 DIL than LA. All measured milk hormones were significantly lower in CM1.5 compared to CM3.2, bulk-tank milk and LA. An exception was the LA of IGF-1, which was significantly lower than the IGF-1 content in CM1.5. Blood biochemical parameters fluctuated evenly during lactation and were within the reference range. Hormone concentrations in cow’s milk fluctuate during lactation, giving milk an important role in the context of public health.

Energy-Related Hormones in Raw and Retail Cow’s Milk and Possible Risk for Consumers

PI Veterinary Institute of the Republic of Srpska Dr Vaso Butozan

Department of Physiology and Biochemistry

University of Belgrade, National Institute of the Republic of Serbia

Acta Veterinaria

This work is licensed under the Creative Commons Attribution 4.0 International License.

The study aimed to determine the concentration of energy-related hormones in cow’s milk and to consider them from a public health perspective. Fourteen...

Energy-Related Hormones in Raw and Retail Cow’s Milk and Possible Risk for Consumers

Published Online: Mar 16, 2024

Page range: 1 - 16

Received: Nov 21, 2023

Accepted: Feb 22, 2024

DOI: https://doi.org/10.2478/acve-2024-0001

Keywords
cows, milk hormones, consumer health

© 2024 Dragan Knežević et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Energy-Related Hormones in Raw and Retail Cow’s Milk and Possible Risk for Consumers

Published Online: Mar 16, 2024

Page range: 1 - 16

Received: Nov 21, 2023

Accepted: Feb 22, 2024

DOI: https://doi.org/10.2478/acve-2024-0001

Keywordscows, milk hormones, consumer health

© 2024 Dragan Knežević et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
cows, milk hormones, consumer health