[Relation between the mineral content of cow's milk, the quantity of milk and the fat content of the milk].

The reverse evaluation of the effect of the content of minerals in milk on the milk yield per day and on the milk fat content indicated that the milk of less productive cows had a significantly higher content of sodium and a highly significantly higher content of magnesium, as compared with the higher-yielding cows. The milk with a higher content of fat showed a highly significant difference in the content of calcium and a significant difference in the content of potassium in favour of the less productive cows. The content of phosphorus in milk and the daily milk yield bear a significant relation. The group of cows with higher milk yields showed a highly significant positive relation between the content of calcium, potassium and sodium in milk on the one hand and the fat content in milk on the other. The lower-yielding cows were found to have a significant negative relation between sodium and fat content in milk. The results suggest that minerals are involved in the metabolism in cows' organisms, thus influencing the production of milk and the content of fat in milk.