Topics:
Animal Refresher, Animal Reproduction
Hormone for Duct System Growth of Mammary Gland
View Complete Answer & Explanation
Question (English)
The hormone responsible for the growth of the duct system of the mammary gland is:
- Estrogen ✓ Correct
- Progesterone
- Both Estrogen and Progesterone
- Prolactin
Explanation:
Correct Answer: Estrogen
Estrogen is responsible for the growth and branching of the duct system (ductal growth) of the mammary gland.
Mammary Development Summary
- Duct growth: Estrogen ✔
- Alveolar (lobulo-alveolar) growth: Progesterone
- Milk synthesis (lactogenesis): Prolactin (+ somatotropin, glucocorticoids)
- Milk let-down (ejection): Oxytocin
Why This Matters Clinically
- In dairy animals, understanding the hormonal control of mammary development helps explain why cows with reproductive disorders (anovulation, luteal cysts) that produce excess estrogen or progesterone may show abnormal udder development.
- Exogenous estrogen treatment can be used to stimulate duct development in prepubertal heifers for induction of lactation.
📚 About this Topic — Animal Refresher
This multiple choice question is from Animal Refresher, Animal Reproduction. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
