10.2 Lactation Flashcards
● Process of providing milk to offsprings
● Period wherein the dam produces milk to nourish offspring/s
● Provides nutrition & maternal antibodies (colostrum) to the young after birth
lactation
PROCESS OF LACTATION
- Mammary gland development
- Lactogenesis
- Milk ejection or Milk-let-down
● Milk-producing gland of lactating females
● No. & position varies among animals
MAMMARY GLAND
major changes in mammary gland during pregnancy
Changes into:
● MG fat cells gradually replaced by alveoli - secretory alveoli through hormonal effects of progesterone
● Development of MG ducts
● Development of blood vessels
● Development of CT stroma
ducts of mammary gland (not so much branching and few secretory alveoli)
Virgin
As lactation occurs
massive active alveoli
decrease of branching of branched system
Involution
development of duct and few secretory
alveoli and more fats
Puberty
ducts, and more fats with side branching
Mature Virgin
development of secretory alveoli and lobule growth in parenchyma
Pregnancy
very active and mature secretory alveoli (production of colostrum)
lactation
Elongation & Branching of MG Ducts in dairy
heifers
○ Hormonally controlled
○ During puberty - development of duct system
○ Pregnant - more elaborate development in mammary gland ducts; lobulation is developed
ESTROGEN with PROLACTIN & GH
development of MAMMARY GLAND during
LACTATION
- Increase no. of secretory alveoli
- Reduction of CT stroma
- Development of duct system
MILK STORAGE IN MAMMARY GLAND:
MG Secretory alveoli
60-80% of secreted milk
MILK STORAGE IN MAMMARY GLAND:
MG ducts & cistern
(between milking)
20-40% of secreted milk
