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Maturation of brainstem reflex mechanisms in relation to the transition from liquid to solid food ingestion
Insights
Neonatal rats, cats, and rabbits show long-latency reflexes that mature before solid food ingestion. Guinea pigs exhibit adult-like reflexes at birth, coinciding with their early solid food intake.
Area of Science:
- Neuroscience
- Developmental Biology
- Comparative Physiology
Background:
- Oral reflexes are crucial for feeding behaviors.
- The maturation of these reflexes varies across species, influencing early feeding strategies.
Purpose of the Study:
- To investigate the developmental trajectory of oral reflex latency in pre-weaning mammals.
- To correlate reflex maturation with the onset of solid food ingestion.
Main Methods:
- Electrical stimulation of the mouth was used to induce reflex activity in the digastric and submandibular muscles.
- Latency periods of these reflexes were measured in rats, rabbits, cats, and guinea pigs from birth through maturation.
Main Results:
- Rats, cats, and rabbits displayed long reflex latencies at birth, which decreased with maturation, reaching adult values just before solid food intake.
- Guinea pigs, uniquely, possessed adult-like reflex latencies at birth, aligning with their immediate consumption of solid food.
- Rabbit reflex latency reduction occurred in two phases: a rapid central phase (1-2 days) and a slower, longer phase (approx. 2 weeks).
Conclusions:
- The maturation of oral reflexes is closely linked to the transition to solid food feeding across species.
- Species-specific developmental timelines for oral reflexes reflect distinct feeding adaptations.
- The two-phase maturation of reflexes in rabbits suggests complex central and peripheral neural adjustments.
Abstract:
Reflex activity was induced in the digastric and other submandibular muscles of pre-weaning rats, rabbits, cats and guinea pigs by electrical stimulation of the mouth. At birth, rats, cats and rabbits had long-latency reflexes which shortened with maturation. In the rat and rabbit, adult values are reached a day or so before they are known to ingest solid food. Only the guinea pig, which eats solids on day 1, had the adult latency at birth. The time course of the latency reduction in the rabbit appeared to have two phases. The first phase was rapid (1-2 days) and appeared to be largely of central origin. The second phase was slower and lasted for about 2 weeks.