The following table shows the amounts of the componenets most prominent and/or are is present in the three milks from different backgrounds..
Compared to human milk and cow's milk, mare's milk fat is the least of the three. It has a protein content that is between human milk and cow, which is what most have. Y has the lactose content is similar to human milk, which is higher than that of cow milk.
Of the three types of comparative milk, mare's milk is less energy, but it must be borne in mind that a large part of the energy supplied by the sugars comes from milk and no fat. That is why it gives us energy mare's milk is largely, quick energy we expend during the day and no energy slowly metabolized as that comes from saturated fat cow's milk.