Influence of milk fat-to-protein ratio on the energetic status of Holstein-Friesian cows in early lactation

This study presents the results of an investigation into the organic components of milk in Holstein-Friesian cows during early lactation, with a particular emphasis on analyzing key biochemical parameters—specifically protein and fat—and their interrelationship. Special attention was given to evaluating the correlation between these components in order to identify cows experiencing a pronounced negative energy balance during early lactation, while simultaneously aiming to prevent metabolic disorders and reproductive complications. The research was conducted on 90 Holstein-Friesian dairy cows at an early stage of lactation, on a farm located in the municipality of Dimitrovgrad. Routine sampling for milk biochemical analysis was used for this purpose, focusing on fat and protein content and their ratio. The analysis was performed using a Milkoscan device. The results indicate that the energy status of high-yielding dairy cows has a significant influence on their production performance, reproductive efficiency, and overall health.