Inbreeding is carried out in animal husbandry because it

Options

A. increases vigour
B. improves the breed
C. increases heterozygosity
D. increases homozygosity.

Explanation

### Step-by-Step Solution:

1. **Understanding Inbreeding**: Inbreeding refers to the mating of animals that are genetically similar or identical. This practice is common in animal husbandry to enhance certain desirable traits within a breed.

2. **Purpose of Inbreeding**: The primary goal of inbreeding is to increase homozygosity, which means that the offspring will have a higher chance of inheriting the same alleles from both parents. This can lead to the expression of dominant traits.

3. **Effects of Inbreeding**: By increasing homozygosity, inbreeding can help to accumulate superior traits (dominant characters) while reducing the occurrence of undesirable traits (recessive characters). This is beneficial in animal husbandry as it can lead to improved breeds.

4. **Conclusion**: In animal husbandry, inbreeding is carried out primarily to increase homozygosity, which enhances the expression of desirable traits in the animals.

5. **Final Answer**: Therefore, the correct reason for carrying out inbreeding in animal husbandry is that it increases homozygosity.