Trace mineral interactions in broiler chicken diets.

Area of Science:

• Animal Nutrition
• Poultry Science
• Trace Mineral Metabolism

Background:

• Trace minerals, including copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn), are essential for broiler chicken health and performance.
• Understanding the interactions between these minerals, particularly organic forms, is crucial for optimizing feed formulations.
• Zinc deficiency is a common concern in poultry diets, potentially impacting the efficacy of other supplemented minerals.

Purpose of the Study:

• To investigate the interactive effects of organic copper, iron, manganese, and zinc on broiler chicken performance.
• To determine the primary limiting trace mineral among Cu, Fe, Mn, and Zn in broiler diets.
• To evaluate the impact of zinc deficiency on the metabolism and utilization of other trace minerals.

Main Methods:

• Three experiments were conducted using broiler chickens fed a control diet deficient in Cu, Fe, Mn, and Zn.
• Diets were supplemented with individual or combined organic forms of Cu, Fe, Mn, and Zn, as well as inorganic forms for comparison.
• Zinc depletion studies were performed to assess the effects of organic and inorganic zinc deficiency on bird performance and mineral content.

Main Results:

• Supplemental organic zinc, alone or in combination, significantly enhanced feed intake, body weight gain, and tibia bone length.
• Organic copper, iron, and manganese supplementation to zinc-deficient diets did not significantly improve performance and were largely excreted.
• Zinc deficiency reduced feed intake, body weight gain, and tibia bone zinc content, while organic iron uptake by tibia was unaffected, though total iron content decreased.

Conclusions:

• Zinc is identified as the first limiting trace mineral in the studied broiler diet.
• Organic zinc supplementation is critical for improving broiler performance, outweighing benefits from other organic trace minerals when zinc is deficient.
• Excessive organic iron and copper intake increased feed intake and tibia bone iron content but did not enhance overall broiler performance in the absence of adequate zinc.