11:067:330 Lecture 19: Lactation
21 Jul 2017
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Document Summary
Lacteal secretion of female mammals = milk key to nourishment and growth of young. Milk = nature"s perfect food contains all five classes of nutrients. Milk composition differs across species: each milk is different based on needs of that species offspring. Aquatic species have milk extremely high in fat (for insulation to regulate body temp in water) Colostrum first fluid from mammary gland after birth: nutrient dense (high dm, protein, fat, mineral content) Milk yield (volume) directly related to rate of lactose synthesis in mammary gland. Fairly constant milk lactose content (~4. 9% in holsteins) Milk fat and protein contents are variable and exhibit inverse relationship with milk yield: Low milk yield = higher milk fat / protein content. High milk yield = lower fat / protein content. People recognized nutritional value of milk domesticated and selectively bred ruminants for milk. Ruminants important in human food chain: eat indigestible things and convert them to edible products.
