Horomone used in sterile cows to induce lactation :

Options

A. Estrogen
B. Progesterone
C. Relaxin
D. Stilbestrol

Answer

**Step-by-Step Solution:**

1. **Identify the Hormone**: The question asks for the hormone used in sterile cows to induce lactation.

2. **Understand the Role of Hormones**: In dairy science, certain hormones are used to stimulate milk production. In this context, we are looking for a specific hormone that can be administered to sterile cows.

3. **Recognize the Key Hormone**: The hormone that is specifically mentioned in the transcript is Stilbestrol. It is a synthetic non-steroidal compound that mimics the properties of estrogen.

4. **Explain the Function of Stilbestrol**: Stilbestrol is used in sterile cows to induce lactation due to its estrogen-like properties, which help stimulate the mammary glands to produce milk.

5. **Differentiate Other Hormones**: While natural estrogen and progesterone are also important in reproductive processes, they are not specifically used for inducing lactation in sterile cows. Relaxin is involved in parturition but does not induce lactation.

6. **Conclude with the Correct Answer**: Therefore, the hormone used in sterile cows to induce lactation is Stilbestrol.

**Final Answer**: Stilbestrol

---