Breeder age influences embryogenesis in broiler hatching eggs.

Area of Science:

• Poultry Science
• Animal Nutrition
• Embryology

Background:

• Dietary fat and broiler breeder age are critical factors influencing reproductive efficiency and offspring development.
• Understanding these effects is crucial for optimizing broiler production and hatchability.

Purpose of the Study:

• To investigate the impact of dietary fat and broiler breeder age on egg and embryo characteristics during incubation.
• To determine how changes in eggshell properties with breeder age affect yolk uptake and embryonic development.

Main Methods:

• Broiler breeders were fed diets with varying fat content (poultry fat or corn oil) and energy levels.
• Eggs were collected from hens at 27 and 36 weeks of age for incubation.
• Egg weight loss, embryo weights (wet and dry), moisture content, eggshell weight, yolk sac weight, and liver weights were measured at various incubation stages.

Main Results:

• Dietary fat composition did not significantly affect egg or embryo characteristics.
• Eggs from younger hens (27 weeks) exhibited higher eggshell weight and lower egg weight loss compared to older hens (36 weeks).
• Embryos from younger hens showed higher dry weight and lower wet liver weight at Day 18, indicating differences in nutrient utilization and growth rates.

Conclusions:

• Broiler breeder age, not dietary fat, significantly alters egg and embryo characteristics during incubation.
• Changes in eggshell weight and composition with breeder age influence yolk sac absorption and embryonic growth.
• These findings highlight the importance of breeder age management for optimizing embryo development and hatchling quality.