Topics:
Animal Physiology, Animal Refresher
Match the Column – Hormones and Their Functions
Match the column:
| TABLE-I | TABLE-II |
|---|---|
| 1) Pregnancy | a) FSH |
| 2) Super-ovulation | b) Progesterone |
| 3) Estrus synchronization | c) Estrogen |
| 4) Heat | d) Thyroxin |
| 5) B.M.R. | e) Insulin |
| 6) Glucose metabolism | f) PGF2α |
- 1-b, 2-a, 3-f, 4-c, 5-d, 6-e — Correct Answer
- 1-a, 2-b, 3-c, 4-d, 5-e, 6-f
- 1-c, 2-a, 3-f, 4-b, 5-d, 6-e
- 1-b, 2-f, 3-a, 4-c, 5-e, 6-d
Explanation:
Correct Answer: 1-b, 2-a, 3-f, 4-c, 5-d, 6-e
Each physiological event is linked to a specific hormone as follows:
- 1-b: Pregnancy → Progesterone — Known as the 'hormone of pregnancy,' progesterone prepares and maintains the uterine endometrium for implantation and prevents uterine contractions during gestation. Example: In a pregnant cow, progesterone from the corpus luteum and later from the placenta sustains pregnancy throughout the 280-day gestation.
- 2-a: Super-ovulation → FSH — Follicle Stimulating Hormone (FSH) stimulates the development of multiple ovarian follicles. In embryo transfer programs, exogenous FSH is injected into donor cows to induce super-ovulation (release of multiple ova).
- 3-f: Estrus synchronization → PGF2α — Prostaglandin F2α (PGF2α) causes luteolysis (regression of corpus luteum), leading to estrus. It is widely used in cattle breeding programs to synchronize the estrus cycle of a herd.
- 4-c: Heat → Estrogen — Estrogen secreted by ovarian follicles is responsible for the behavioral signs of estrus (heat) in female animals — restlessness, mounting behavior, and vaginal discharge.
- 5-d: B.M.R. → Thyroxin — Thyroxin (T4) produced by the thyroid gland is the primary regulator of Basal Metabolic Rate (BMR). Higher thyroxin = higher BMR = more heat production.
- 6-e: Glucose metabolism → Insulin — Insulin from β-cells of the pancreas promotes cellular uptake of glucose and lowers blood glucose. It is the key hormone of glucose homeostasis.
