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.
(Nahl 66. Verse)
The Quran appeared 600 years before the Muslim scientist Ibn Nefis1İbn-i Nefis, who is a famous Islamic scholar, is the first medical scientist who studies blood circulation and finds blood circulation. It was revealed by Ibn Nefis centuries before all the information about blood circulation was presented by the European medical scientist Miguel Servet, Realdo Colombo and Harvey in 1500s. It was advocated as a thesis in 1953 by the Paris Medical Faculty regarding the finding of Ibn Nefis's blood circulation and was accepted by proving that it was Ibn Nefis who was the first to find blood circulation in the world. http://www.tibbiyardim.com/ibn-i-nefis-kimdir.html who defined the blood circulation and 1000 years before William Harvey brought this understanding to the Western world. This verse in the Qur'an described the source of milk components in accordance with these concepts, before about fourteen centuries ago, before knowing what happens in the intestines to ensure nutrient absorption through digestion absorption.
The basic substances that feed the body are formed as a result of chemical transformations in the digestive system. The digested substances are included in the bloodstream from the intestinal wall. In this way, it is referred to the relevant organs. The milk glands are fed from the blood like other body tissues. Milk is secreted from the milk glands after many stages. Its nutritional value is enormous, wonderful food. Man can't consume half-digested food in the animal's abdomen, nor can he directly consume animal blood. In order not to cause serious poisoning or even death, Allah (p.v.t.) offers a clean and healthy perfect food for the benefit of the people with its highly complex biological systems. Thus, feeding milk is produced, which is drinkable from blood and semi-digested food that people cannot consume directly.
What is described in the verse about the biological formation of milk is in great harmony with the information that sciences such as physiology and anatomy present today. The word "en'âm", called the dairy animal, covers sheep, goats, cattle and camels. The Great Mighty Power draws attention to its wisdomful creativity: with the word "fers" meaning food residue, the nutrients of foods are taken during digestion and no longer worth it for their live metabolism, which will be thrown out in feces after a while residues. In the digestive process, elements from the intestinal tract are carried to the blood and constitute the infrastructure of a completely different system. In the verse, milk is in dicated that it is in a position between this food residue and the blood. Milk comes from the blood-carried foods with the system of nutrient growth in the body, never interfere with them and has a different value from them with its chemical structure and characteristics. Almost between milk and the other two substances (blood and food residues), a veil is drawn with the power of Allah, and the purity of milk in terms of color, taste and smell is prevented by mixing into one or both of them.2https://www.researchgate.net/publication/336128544_THE_MIRACLE
Blood flow to the diaper is extremely important for breast function. All milk pioneers come from the blood. To produce 1 liter of milk, it is necessary to pass 500 liters of blood through the breast. When a cow produces 60 liters of milk a day, 30,000 liters of blood circulates from the milk cloth.
"It is very remarkable that blood is mentioned in the formation of milk. As such, blood circulates through the body and carries the foodstuffs and oxygen that tissues and organs need. Thus, the role of blood in ensuring the occurring of nutrients in manufactured milk is of course very large. It seems that it is unthinkable that the Qur'an, which fourteen centuries ago was about the vital activity of blood in the body and its role in the formation of milk, is a human word. Because at that time, there was no school that knew and taught such information that formed the basis of science." 3Jalal Yildirim, Quran Interpretation of the Century in the Light of Knowledge
God knows best of all.