Behavioral thermoregulation in chicks: the best nest

Area of Science:

• Animal Behavior
• Physiology
• Developmental Biology

Background:

• Prehomeothermic chicks (less than 3 weeks old) have limited capacity for physiological thermoregulation.
• Behavioral thermoregulation is crucial for survival in altricial species during early development.

Purpose of the Study:

• To investigate the behavioral thermoregulation capabilities of prehomeothermic chicks.
• To determine if chicks prioritize thermoregulation over other behaviors like feeding and growth.
• To assess the impact of environmental options on behavioral thermoregulation strategies.

Main Methods:

• Chicks were provided with choices of heated/unheated nests, running wheels, and varied protein diets.
• Experiments involved cold-reared and warm-reared groups under different nesting conditions.
• Behavioral observations, dietary selection, food intake, and growth rates were monitored.

Main Results:

• Chicks with heated nests exhibited reduced running activity and faster growth but maintained normal body temperatures.
• Cold-reared chicks with heated nests selected higher protein diets but consumed less overall, leading to slower growth.
• Despite variations in growth and diet, all chicks successfully maintained euthermia.

Conclusions:

• Behavioral thermoregulation is a primary concern for chicks in the first three weeks of life.
• Prehomeothermic chicks demonstrate sophisticated behavioral strategies to overcome energetic challenges.
• Environmental enrichment with naturalistic options supports effective thermoregulatory behaviors.