Which hormone is released from mammary gland?

Q. The hormone responsible for milk release from mammary glands is produced by_____.

Q. Which hormone is/are responsible to stimulate release of milk from mother breast and secretion of mammary gland after child birth ?

Q. Which hormone is responsible for stimulation of vigorous contraction in uterus at the time of child birth and milk ejection from the mammary gland?

Q. After birth, colostrum is released from mammary glands which is rich in