Discuss briefly how pure lines are created in animal husbandry.

Explanation

**Step-by-Step Solution:**

1. **Definition of Pure Lines**: Pure lines in animal husbandry refer to a group of animals that are genetically uniform and possess specific desirable traits. These traits are consistently passed down to the offspring.

2. **Breeding Process**: The creation of pure lines is primarily achieved through a breeding process. This involves mating animals of the same breed to ensure genetic consistency.

3. **In-Breeding**: The most common method for developing pure lines is in-breeding. In-breeding is the mating of closely related individuals within the same breed. This process helps to maintain and enhance specific traits.

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