In cattle farming, exotic breeds such as Jersey and Brown Swiss are primarily selected for which trait?

The correct option is

Extended lactation periods

Explanation

In cattle farming, cattle breeds are classified based on their utility, such as milch breeds (milk-producing) and draught breeds (used for labor). Breeding programs often utilize specific varieties to maximize desirable traits like milk yield, disease resistance, and adaptability.

Detailed Analysis:

• High resistance to local diseases is incorrect: High resistance to local diseases is a primary characteristic of indigenous (local) breeds, such as Red Sindhi and Sahiwal. Exotic breeds are generally more susceptible to local environmental pathogens.
• Extended lactation periods is correct: Exotic or foreign breeds, such as Jersey and Brown Swiss, are primarily selected for their long lactation periods. This trait ensures a sustained and high volume of milk production over time.
• Low feed maintenance requirements is incorrect: Exotic breeds typically require high-quality, nutrient-rich feed and specific environmental conditions to maintain their health and high milk output. They generally have higher maintenance requirements compared to hardy indigenous breeds.
• High draught power capacity is incorrect: High draught power capacity is a trait associated with specific indigenous draught breeds (e.g., Nagori, Hallikar). Exotic milch breeds are not selected for physical labor capabilities.

Key Takeaway:

Exotic cattle breeds (e.g., Jersey, Brown Swiss) are utilized for their extended lactation periods, whereas indigenous breeds are valued for their robust disease resistance.