Ontogenetic changes in Mammalian feeding: insights from electromyographic data

Area of Science:

• Comparative physiology
• Developmental biology
• Neuroscience

Background:

• Mammalian infants transition from milk to solids, but the neuromuscular adaptations are poorly understood.
• Liquid and solid food transport/swallowing utilize distinct motor patterns.
• Porcine models offer insights into mammalian developmental changes.

Purpose of the Study:

• To investigate neuromuscular control changes during the diet transition from liquid to solid food in a porcine model.
• To test hypotheses on alterations in motor patterns and muscle activity during weaning.
• To determine the influence of food consistency on feeding mechanics.

Main Methods:

• Electromyography (EMG) data from five oropharyngeal muscles in pigs at infant, juvenile, and adult stages.
• Analysis of feeding on milk, porridge, and dry chow.
• Measurement of cycle frequency and EMG signal variation in transport and swallow cycles.

Main Results:

• Motor pattern variation decreased with age, indicating maturation of feeding mechanisms by adulthood.
• Infants showed less transport cycle variation than juveniles drinking milk, potentially due to efficient suckling seals.
• Food consistency significantly impacted motor pattern variation, with solids yielding the least variation, especially in newly weaned animals.

Conclusions:

• Food consistency is a key factor influencing neuromuscular motor patterns during the transition to solid foods.
• Feeding mechanics mature with age, but dietary changes also drive significant adaptations.
• These findings highlight the complex interplay between development, diet, and motor control in mammalian feeding.