Physiological stimuli of thirst and drinking patterns in ponies.

摘要: Summary The stimuli that elicit thirst were studied in four ponies. Nineteen hours of water deprivation produced an increase plasma protein from 67 ± 0.1 g/litre to 72 2 g/litre, a mean (± se) sodium 139 3 145 mmol/litre and osmolality 297 1 306 mosmol/litre. Undeprived ponies drank 1.5 0.9 kg/30 mins; 19 h deprived 10.2 2.5 mins corrected the deficits protein, as well compensating for they would have drunk during period. In order determine if stimulate thirst, 250 ml 15 per cent chloride was infused intravenously. The when increased rose 136 143 mmol/litre. Ponies with 2.9 0.7 kg; those 0.5 kg. In decrease volume injected or mg/kg bodyweight (bwt) frusemide. Plasma 68 pre-injection 75 after bwt frusemide 81 treated voided 5.3 0.81 kg urine 3.0 water. mg 6.4 5 4.3 1.4 Controls 0.6 When food freely available 27 8 mins/day, 89 which occurred within period 10 before 30 feeding. They 8.7 kg/day at rate 552 232 ml/min. It concluded usually drink periprandially challenged either osmotic pressure their body fluids responded by increasing intake.