Which gland in the female undergoes differentiation during pregnancy and lactation?

Signals for parturition originate from

$A$: Colostrum is a very efficient means of transferring immunity to a newborn.
$R$: $IgM$ from mother's milk protects the baby from the respiratory infection usually affecting in young age.

The signals for parturition originate from the fully developed fetus and the placenta,which induce mild uterine contractions called the fetal ejection reflex. This triggers the release of which hormone?

Identify the correct path of milk secretion by the mammary glands.

Which of the following statements is true regarding colostrum?