Abstract
In healthy Holstein dairy cows the milk fat and protein ratios were minimum at the peak of lactation. While the highest fat content was observed immediately after partition without significant changes in protein content for about 3 months post partition. The proportion of milk protin ratio to milk fat ratio (P-F ratio) was 86.7% on an average. In cases with fat cow syndrome, the milk volume, fat content, protein ratio and protein content were lower than those of healthy cows, whereas the milk fat ratio was higher. The postpartum P-F ratio was significantly decreased in the affected cases. It was indicated that changes in the balance of milk components might be exactly evaluated from P-F ratio together with milk fat and protein ratios and contents.
