The method which was used to develop new animal breeds is

Options

A. close breeding
B. inbreeding
C. cross breeding
D. out crossing

Answer

### Step-by-Step Solution:

1. **Understanding Animal Breeding**:
- Animal breeding is the process of mating selected animals to produce specific qualities and characteristics in offspring.

2. **Types of Breeding**:
- There are two main types of breeding: **Inbreeding** and **Outbreeding**.
- **Inbreeding** involves mating animals of the same breed, often leading to increased homozygosity and a pure line.
- **Outbreeding** involves mating animals of different breeds.

3. **Inbreeding**:
- Inbreeding is done for 4 to 6 generations to create a pure line. However, it can lead to inbreeding depression, which results in reduced fertility and productivity due to lack of genetic variation.

4. **Outcrossing**:
- Outcrossing is a method to overcome inbreeding depression. It involves mating animals from the same breed but with a gap of 5 to 7 generations in their ancestry to ensure they are not closely related.

5. **Crossbreeding**:
- Crossbreeding is a type of outbreeding where two different breeds are mated to create a new breed. For example, Hissardale sheep were created by crossing Bucanary ewes and Marino rams.

6. **Conclusion**:
- The method used to develop new animal breeds is **crossbreeding**, as it combines traits from different breeds to create a new breed with desirable characteristics.

### Final Answer:
The method which was used to develop new animal breeds is **crossbreeding**.

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