Lecture 22 - Lactation And Milk
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What is lactation?
Secretion of milk from mammary gland • source of nutrients for newborn offspring
What are the 3 main groups of mammals?
Monotremes Marsupials Placentals
What are Monotremes?
Egg laying mammals • primitive glands with absent teats Ex platypus
What are marsupials?
Young are carried on a pouch • short gestation • extensive lactation period Kangaroo
What are placental mammals?
Have a complex placenta Greater investment on gestation: fetus develops in-utero
What is the difference between altricial and precocial young?
Altricial - immature at birth, rely on greater maternal care Precocial - relatively mature at birth, sight and hearing fully developed
Mammary gland location and amount
Located on pelvic, abdominal or pectoral region Number of glands vary with species