The question has two parts Ancient knowledge regarding :First: 1- The precursor of milk is digested food or excretions in the stomach. Second: The role of blood in circulating the components required for milk formation.
We need you to provide a better definition of "the ancients" . Dairying was underway in many areas by 6000 BCE (8000 years ago). Farmers were already controlling when cows calved, but I don't know how much they understood about biology of the process.
In the Quran, ELNAHL SURA (The BEES) verse 66: And verily in cattle (too) will ye find an instructive sign. From what is within their bodies between excretions and blood, We produce, for your drink, milk, pure and agreeable to those who drink it.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
They would have noticed that depending on what cows were grazing on, there would be differences in the flavor of the milk. Some of these flavors would have been very distinct to the plants and it would not have been too big a leap to link food to milk.
Milk production is a physiological process in dairy animals. The nutrients absorbed through digestive organs are into blood and blood goes to the udder and physiological process formation of milk in the udder but in ancient time people have little access to science and mechanism of milk synthesis in the udder.