Broiler production under varying population densities.

Area of Science:

• Animal Science
• Poultry Husbandry
• Animal Welfare

Background:

• Population density is a critical factor influencing livestock growth and health.
• Understanding optimal stocking densities is essential for efficient and ethical poultry production.

Purpose of the Study:

• To investigate the effects of varying population densities on the growth performance and stress indicators of Hubbard x Hubbard chicks.
• To determine the economic implications of different population densities for commercial poultry operations.

Main Methods:

• Six hundred and sixteen chicks were housed at densities ranging from .05 to .11 m2 per bird for seven weeks.
• Growth performance (body weight, feed conversion), carcass quality (breast blisters, ammonia burns), and stress levels (heterophil to lymphocyte ratio) were measured.
• Economic potential was analyzed using decision analysis models (Maximax, Maximin, Equally Likely).

Main Results:

• Lower body weight and carcass quality were observed at the highest density (.05 m2/bird).
• Increased incidence of breast blisters and ammonia burns occurred at .05 m2/bird.
• Higher heterophil to lymphocyte ratios, indicating stress, were found at .09 and .11 m2/bird densities.
• Feed conversion was not significantly affected by population density.

Conclusions:

• The .05 m2/bird density negatively impacted chick growth and welfare, suggesting significant stress.
• While higher densities (.07, .09, .11 m2/bird) supported better growth, they induced physiological stress responses.
• Economic analysis indicated optimal profit potential at .05 m2/bird for some decision models and .07 m2/bird for others, highlighting a trade-off between welfare and profit.