With regard to infants’ intake, the H-F diet induced a higher milk fat content (13%), a higher energy intake (7%), and a higher percentage of energy from fat (8%) than did the H-CHO diet.

The rations to which these criteria lead correspond closely enough to the nutritional standards, i.e. one eats definitely less fats than carbs, and than any variation compared to these values induce easily observable disorders. But once again, these disorders are observable only if basic balance is sufficiently precise so that these signs are usually not apparent, and can thus reappear in the event of overload. When we are permanently overloaded, a point of comparison is missing and we can be convinced to be in a correct balance whereas it is far from being the case.

Are you sure it's the most among all mammals? So far you've only mentioned cheetahs and cows, what about nonhuman primates? Data on pig, bear and canid mother's milk would also seem more relevant than cow's milk. Humans do seem to handle carby foods like fruits better than cats and canids, so it doesn't suprise me that human mother's milk would be more carby than that of cats, but it does surprise me that it's more carby than bovine milk--though I think I have read that before. Why would calves not need as much carbs as human infants, I wonder? Is it because the bovine diet is fiber-rich, instead of fruit-rich? If so, that would suggest that mountain gorilla mother's milk would be lower carb also and we should expect frugivorous chimp mother's milk to have more carbs than mtn gorilla milk.

Generally speaking, species that cache their offspring (leave them alone for hours at a time, like a deer leaving its fawn in the woods hidden, or a wolf leaving her pups in the den) have milk that is high in protein and fat and low in carbohydrate. The offspring may be nursed only a few times a day, getting a lot of milk at any one nursing. The high protein and fat content of the milk make it slow to digest, and it satisfies the baby's hunger for hours.

Other species are "continuous contact" species, either by virtual of the fact that the young are precocial (advanced at birth, like a horse, who can get up and run within the first hour) and can therefore "follow" the mother all the time (this would include almost all hoofed animals) or because the young are carried on the mother's body (marsupials, most primates, including humans). Chimpanzees, gorillas, organutans, and humans all fall in the "carry" category. And, by the way, chimp and gorilla mothers have to provide active support to the offspring for several months as they carry them, the babies can cling, but not strongly enough at first to just hang on all by themselves. Some anthropologists think the very first "tool" invented by humans was a baby sling. Getting far afield. . .

Continuous contact species have milk that is low in protein and fat and high in carbohydrates. The offspring tend to nurse very often, but not take much at any one nursing. The low protein and fat content of the milk make it quick and easy to digest, and the baby is quickly hungry again, but mom is right there, so it just nurses again. I have seen figures of 20 minutes as the length of time it takes a breast milk meal to clear the stomach. Chimp and gorilla babies nurse several times an hour during the day, and sleep with their mothers at night, so presumably nurse at night also.

After 3 to 4 days breasts will begin producing milk that is thin, watery, and sweet. This quenches the baby's thirst and provides the proteins, sugar, and minerals the baby needs. Over time the milk changes and becomes thick and creamy. This satisfies the baby's hunger.[15]
Foremilk, the milk released at the beginning of a feed, is watery, low in fat and high in carbohydrates relative to the creamier hindmilk which is released as the feed progresses. The breast can never be truly "emptied" since milk production is a continuous biological process.
The level of Immunoglobilin A (IgA) in breast milk remains high from day 10 until at least 7.5 months post-partum.[16]
Human milk contains 0.8% to 0.9% protein, 4.5% fat, 7.1% carbohydrates and 0.2% ash (minerals)[17] . Carbohydrates are mainly lactose; several lactose-based oligosaccharides have been identified as minor components.

Milk was obtained from two captive bred cheetahs. The nutrient content was 99.6 g protein; 64.8 g fat; and 40.21 g lactose per kg milk. Small amounts of oligosaccharides, glucose, galactose and fucose were noted