A cow which give more milk per lactation is evolve into pure line by mating with superior bull of same breed for 4-6 generation. Which type of breeding is being referred to in this case?

Options

A. Inbreeding
B. Outbreeding
C. Cross breeding
D. Out crossing

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question describes a scenario where a cow that produces a high amount of milk is mated with a superior bull of the same breed for several generations (4-6). The goal is to evolve this cow into a pure line.

2. **Identifying Key Terms:**
- **Pure Line:** This refers to a population of organisms that consistently produce offspring with the same traits when mated.
- **Lactation:** The period during which a cow produces milk.
- **Superior Bull:** A male with desirable traits that can enhance the quality of offspring.

3. **Types of Breeding:**
- **Inbreeding:** This involves mating individuals that are closely related within the same breed. It is used to enhance specific traits by reducing genetic variability.
- **Outbreeding:** This refers to mating individuals from the same breed but that are not closely related, thus introducing greater genetic diversity.
- **Crossbreeding:** This involves mating individuals from different breeds to produce hybrid offspring.

4. **Analyzing the Scenario:**
The scenario describes breeding a cow with a superior bull of the same breed over multiple generations. This indicates that the breeding pairs are closely related, which aligns with the definition of inbreeding.

5. **Conclusion:**
Based on the analysis, the type of breeding referred to in the question is **inbreeding**. This method is used to develop a pure line by mating individuals of the same breed that are closely related.

**Final Answer:**
The type of breeding being referred to in this case is **inbreeding**.

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