Topics:
Animal Refresher, Animal Reproduction
Match the Column – Hormones & Reproductive Functions
View Complete Answer & Explanation
Question (English)
Match the column — Hormones with their primary reproductive functions:
| TABLE-I (Function) | TABLE-II (Hormone) |
|---|---|
| 1. Heat (estrus) | a. Intermedins |
| 2. Pregnancy | b. PMSG |
| 3. Super ovulation | c. Estrogen |
| 4. Synchronization of oestrus | d. Progesterone |
| 5. Pseudo pregnancy | e. Prolactin |
| 6. Bruce effect | f. PGF2α |
- 1-c, 2-d, 3-b, 4-f, 5-a, 6-e ✓ Correct
- 1-c, 2-d, 3-b, 4-f, 5-e, 6-a
- 1-c, 2-b, 3-d, 4-f, 5-e, 6-a
- 1-d, 2-c, 3-b, 4-f, 5-a, 6-e
Explanation:
Correct Answer: 1-c, 2-d, 3-b, 4-f, 5-a, 6-e
Detailed Explanation
- 1. Heat (estrus) → (c) Estrogen: Estrogen from developing follicles drives the behavioral signs of estrus (receptivity, standing heat, vulval swelling).
- 2. Pregnancy → (d) Progesterone: Progesterone ('hormone of pregnancy') maintains the corpus luteum, prevents uterine contractions, and supports the conceptus throughout gestation.
- 3. Super ovulation → (b) PMSG: PMSG (Pregnant Mare Serum Gonadotropin / eCG) has strong FSH-like activity and is used to induce superovulation in embryo transfer programs.
- 4. Synchronization of oestrus → (f) PGF2α: Prostaglandin F2α (PGF2α) causes luteolysis (regression of the C.L.) → progesterone falls → new follicle wave → synchronized return to estrus. Used extensively for estrus synchronization protocols.
- 5. Pseudo pregnancy → (a) Intermedins (MSH/Prolactin): Pseudopregnancy is maintained by prolactin/intermedins — they sustain the corpus luteum and trigger mammary secretion without a true conceptus.
- 6. Bruce effect → (e) Prolactin: The Bruce effect (pheromone-induced pregnancy block in mice) involves suppression of prolactin secretion, which is needed to maintain the C.L. in early pregnancy. The strange male's pheromones suppress prolactin → C.L. regresses → pregnancy fails.
