ANFS101 Lecture Notes - Lecture 10: Mammary Gland, Estrous Cycle, Colostrum
16 May 2016
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Learning objectives: describe the process of lactation, list the components of milk, identify the major components of the mammary gland, identify and describe a typical lactation curve, explain the process by which bst increases milk production. Mammary gland secretions: colostrum, first secretion, it is not milk, secreted first few days, higher in protein than milk, contains immunoglobulins, protein digestion not functioning b. i. Proteins absorbed intact: critical to newborn survival. Milk: produced and secreted by mammary glands, composition varies with species, structure of mammary gland is similar. Immunoglobulin uptake occurs and colostrum is formed, much of this prior to parturition: stage ii lactogenesis: b. i. Copious milk secretion begins, and during the next few days colostrum production is shut down and milk of normal composition is produced. Mammary gland morphology: alveoli-primary structure, contains secretory cells, arranged in lobules, drained by ductwork, secretory cells, absorb nutrients, transform nutrients from blood b. i. Lactate, fat, and protein in milk: move milk into lumen of alveoli.
