. Feeds and feeding abridged : the essentials of the feeding, care, and management of farm animals, including poultry : adapted and condensed from Feeds and feeding (16th ed.). Feeds; Animal nutrition. 80 FEEDS AND FEEDING, ABRIDGED II. Production op Milk Secretion of milk.—Milk, the marvelous fluid designed by Nature for the nourishment of the young of all mammals, is secreted by special organs, called the mammary glands. Scientists disagree as to the exact process by which the milk is formed in the small, sac-like bodies, known as alveoli, in the udder. However, we do know that the blood, la
. Feeds and feeding abridged : the essentials of the feeding, care, and management of farm animals, including poultry : adapted and condensed from Feeds and feeding (16th ed.). Feeds; Animal nutrition. 80 FEEDS AND FEEDING, ABRIDGED II. Production op Milk Secretion of milk.—Milk, the marvelous fluid designed by Nature for the nourishment of the young of all mammals, is secreted by special organs, called the mammary glands. Scientists disagree as to the exact process by which the milk is formed in the small, sac-like bodies, known as alveoli, in the udder. However, we do know that the blood, laden with nutrients, is brought by the capillaries of the udder to these alveoli. The nutrients then pass thru the walls of the capillaries into the alveoli. There, by one of Nature's wonderful processes, they are converted into milk, which differs entirely in composition from the blood whence it originates. The chief proteins of milk- casein and milk albu- min—differ from all other proteins of the body, and the milk fat likewise has entirely different properties from the body fat of the same animal. Milk sugar, the carbohy- drate of milk, is found nowhere else in the body. While the blood contains much more potassium than sodium, in milk the sodium predominates. Prom the alveoli the milk passes into the network of milk ducts. In some animals the large milk ducts open directly on the surface of the teat, but in others, including the cow, they open into a small cavity, called the milk cistern, which is just above the teat. Most of the milk yielded at one milking is secreted during the milking process, for the udder has room for the storage of but a small part of the total product. Tho the secretion of milk is involuntary and cannot be prevented by the animal, any more than can breathing or the circulation of the blood, the flow may be reduced by nervousness caused by fright, an unfamiliar attendant, or other unusual circumstance. The animal has considerable power to "hol
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfeeds, bookyear1917
