Explanation:

The higher environmental temperatures during the summer affect milk fatty acid composition. Milk fat in the summer tends to be lower in palmitic acid relative to stearic and octadecanoic acids than milk fat from the same cows during the winter. Some of the changes in milk fat percentage and composition with temperature change can be related to changes in blood plasma lipids, but these observations are also confounded by dietary changes. It is observed that no change in milk fat percentage when heat-stressed cows were given water at 10 or 28ºC.