ANIMSCI 2200.01 Lecture Notes - Lecture 9: Prolactin, Galactose, Allometry

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Lobules & lobes- clusters of alveolar tissue supported by connective tissue. Right and left udders receive their own blood supply. For 1 l milk, 500 l blood must pass through the udder. Mammogenesis- development of mammary gland: prenatal; peri-pubertal; post- conception. Lactogenesis- initiation of milk synthesis and secretion; begins with colostrum. Secretory & non-secretory tissue: highly evolved skin gland. Large udder does not equal increase milk: may be increased stromal tissue. Fetal development: treat formation 2nd mogestation, 6 month gestation- udder fully developed. Puberty to parturition: milk secreting tissue developes. Estrogen- ductal development: progesterone- secretory tissue development. Udder cell # and size rises through 5 lactations. Lactogenesis: milk synthesis: lactose is unique to the mammary gland, glucose + galactose, regulates water, casein is unique to the mammary gland, negative charge regulates ca^2, medium chain fatty acids synthesized, fiber in diet = milk fat.

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