The correct answer is To combine long lactation with disease resistance. Explanation & Key Takeaways: • Cross-breeding between exotic and local cattle breeds aims to combine the beneficial traits of both breeds, ensuring better productivity and adaptability. • Exotic breeds, such as Jersey and Holstein Friesian, are known for their high milk yield and long lactation periods. • Local breeds, such as Gir, Sahiwal, and Red Sindhi, are better adapted to local environmental conditions and are highly disease-resistant. • The goal of cross-breeding is to produce offspring that exhibit both higher milk production (a trait of exotic breeds) and resilience to diseases (a trait of local breeds). • This approach enhances the overall economic viability of cattle farming by reducing costs associated with healthcare and improving milk productivity. Related Concepts: • Exotic Breeds: • Jersey: Originating from the British Channel Island of Jersey, this breed is known for its high milk fat content and adaptability to varying climates. • Holstein Friesian: Originating from the Netherlands, this breed is globally recognized for its high milk yield and is often used in commercial dairy farming. • Indigenous Breeds: • Gir: A native Indian breed, known for its heat tolerance, disease resistance, and milk production. • Sahiwal: Originating from Punjab, this breed is renowned for its high milk yield and adaptability to tropical climates. • Red Sindhi: Known for its hardiness and suitability for both milk production and draught work. • Advantages of Cross-Breeding: • Improved milk production due to traits inherited from exotic breeds. • Enhanced disease resistance and heat tolerance due to traits from indigenous breeds. • Better economic returns for farmers by reducing veterinary costs and increasing productivity. • Challenges of Cross-Breeding: • Cross-bred animals may require specialized feeding and care. • Potential for loss of genetic diversity in indigenous breeds if not managed properly. • Breeding programs need to be monitored to ensure the sustainability of the resulting population. • Relevant Programs in India: • Rashtriya Gokul Mission: Aims to preserve and develop indigenous breeds through scientific breeding techniques. • National Dairy Plan (NDP): Focuses on increasing milk production and improving the productivity of milch animals through genetic improvements. Important Notes: • Long Lactation Period: Exotic breeds like Holstein Friesian can produce milk for extended durations, making them ideal for commercial dairy farming. • Disease Resistance: Indigenous breeds have a natural immunity to local diseases, reducing dependency on veterinary interventions. • Economic Impact: Cross-breeding helps farmers achieve higher profitability by combining productivity and resilience traits. • Breeding Techniques: Programs like artificial insemination ensure controlled cross-breeding to achieve desirable traits without compromising genetic diversity.