Hypothalamic neuropeptide Y mRNA is increased after feed restriction in growing broilers.

Area of Science:

• Animal Physiology
• Neuroendocrinology
• Avian Biology

Background:

• Energy balance regulation in broiler chickens is complex.
• Neuropeptide Y (NPY) is a key regulator of appetite and energy homeostasis in mammals.
• Understanding NPY's role in broiler chickens can inform strategies for growth and feed efficiency.

Purpose of the Study:

• To investigate the role of neuropeptide Y (NPY) gene expression in the hypothalamus of broiler chickens.
• To determine if NPY gene expression differs between broiler lines selected for rapid growth and those not selected.
• To assess the impact of feed restriction on hypothalamic NPY mRNA levels.

Main Methods:

• Gene expression analysis of NPY in the hypothalamus of broiler chickens.
• Comparison between a standard Ross male line and a Ross relaxed line (not selected for rapid growth).
• Evaluation of birds fed ad libitum versus those on a restricted feeding program.

Main Results:

• NPY mRNA levels were significantly elevated in feed-restricted birds compared to ad libitum controls in both broiler lines (P < 0.0001).
• No significant differences in NPY mRNA levels were found between the standard Ross male line and the Ross relaxed line.
• Hypothalamic NPY gene expression is responsive to changes in energetic status in broiler chickens.

Conclusions:

• Hypothalamic NPY gene expression in broiler chickens is sensitive to energetic status, similar to mammals.
• Selection for rapid growth in broiler chickens is not associated with altered hypothalamic NPY mRNA levels.
• NPY may play a conserved role in energy balance regulation across different avian lines and feeding conditions.