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Respiratory and cardiovascular responses to feeding in lambs



Respiratory and cardiovascular responses to feeding in lambs



Journal of Physiology 275: 40P-41P



Lambs sucked from bottles at 4 to 5 sucks/s for up to 2 min. A single swallowing movement followed each suck when milk flow was unrestricted. Effective breathing movements, intrapleural pressure and tracheal air flow were absent for the first 10 to 20 s. After 30 s sucking PO2 had decreased from 83 to 60 mmHg and PCO2 increased from 29 to 37 mmHg. Heart rate and arterial pressure increased in anticipation of feeding but decreased when sucking was established. These responses occurred even when the lambs breathed 100% oxygen. Left ventricular injections of radioactive microspheres were made in 6 lambs which had been sucking for 30 s. Cardiac output decreased slightly, but mean blood flow increased to the brain from 85 to 114 ml/min 100 g and to the extracerebral tissue of the head from 26 to 72 ml/min 100 g. There was no significant difference in rate of sucking, swallowing or breathing, nor in changes in arterial pressure and heart rate in lambs given a laryngeal stimulant, water or milk, or a nonstimulant, saline.

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Accession: 000485331

Download citation: RISBibTeXText

PMID: 633134



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