Innovative layer genetics to handle global challenges in egg production

Area of Science:

• Animal Science
• Genetics
• Poultry Breeding

Background:

• Commercial layer breeding requires anticipating market needs 5+ years ahead, with current trends emphasizing animal welfare and cage-free systems.
• Key welfare traits include nesting behavior, reduced feather-pecking and cannibalism, stronger eggshells, and improved bone quality for longer production cycles without molting.

Purpose of the Study:

• To outline genetic selection strategies for commercial layer breeding that balance market demands for high performance with increasing welfare requirements.
• To identify key heritable traits related to animal welfare and skeletal integrity for inclusion in breeding programs.

Main Methods:

• Analysis of genetic trends in egg output and feed efficiency.
• Assessment of heritability for traits related to feather-pecking, cannibalism, and skeletal integrity (keel bone palpation, humerus ultrasound).
• Integration of performance testing with genome-wide DNA marker analysis.

Main Results:

• Positive genetic trends observed for egg output and feed efficiency, contributing to land savings.
• Heritability estimates for beak shape adjustment (0.10-0.25) suggest a role in reducing cannibalism.
• Heritability estimates for bone quality traits (0.15-0.30) indicate potential for genetic improvement in skeletal integrity.

Conclusions:

• Balancing performance traits with welfare indicators like bone quality and reduced feather-pecking is crucial for sustainable layer breeding.
• Genome-wide DNA marker analysis combined with performance testing offers a powerful approach for achieving balanced genetic progress in poultry.
• Future breeding programs must integrate welfare traits to meet evolving market and ethical demands in the poultry industry.