Which of the following is correct for artificial insemination method in animal breeding?

Options

A. It is very economical and gives high rate of successful fertilization.
B. The semen is collected from superior bull can be used immediately or can frozen at very low temperature for later use.
C. The frozen semen can be stored for a long period, and transported.
D. All of the above

Answer

To solve the question regarding the artificial insemination method in animal breeding, we will analyze the provided statements step by step.

### Step-by-Step Solution:

1. **Understanding Artificial Insemination**:
- Artificial insemination (AI) is a reproductive technology used in animal breeding where sperm is introduced into the female reproductive tract by means other than natural mating. This can be done through the cervix or directly into the uterine cavity.

**Hint**: Remember that AI increases the chances of fertilization by allowing controlled introduction of sperm.

2. **Evaluating the First Statement**:
- The first option states that AI is "very economical and gives a high rate of successful fertilization."
- This is true because AI reduces the need for multiple matings and allows for the use of genetically superior males, which can lead to higher success rates in fertilization.

**Hint**: Consider the cost-effectiveness and efficiency of AI compared to natural breeding.

3. **Evaluating the Second Statement**:
- The second option mentions that "the semen is collected from the superior pool can be used immediately or can be frozen at very low temperature for later use."
- This statement is also correct. Semen can be collected, processed, and either used right away or frozen for future insemination, allowing for flexibility and convenience in breeding programs.

**Hint**: Think about how freezing semen contributes to the longevity and transportability of genetic material.

4. **Evaluating the Third Statement**:
- The third option states "all of the above."
- Since both previous statements are correct, this option is also correct.

**Hint**: If multiple statements are true, the option that includes all of them is likely the correct choice.

5. **Conclusion**:
- Based on the evaluation of all statements, the correct answer is option 4: "All of the above," as all statements regarding artificial insemination are accurate.

### Final Answer:
The correct answer is **option 4: All of the above**.