Elsevier

Physiology & Behavior

Volume 45, Issue 3, March 1989, Pages 659-661
Physiology & Behavior

Brief communication
Vasopressin in dehydrated and rehydrated ponies

https://doi.org/10.1016/0031-9384(89)90087-5Get rights and content
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Abstract

Six pony mares deprived of water for 24 hours showed significant increases in plasma vasopressin (2.8 pg/ml) and osmolality (9 mosmol/kg). When water was made available the ponies drank rapidly (5 of 6 drank to satiety within 90 seconds) and corrected their fluid deficits precisely. Vasopressin did not return to predehydration levels until osmolality did after 15 minutes of access to water. The house differs from rodents and humans, but is similar to pigs in that vasopressin levels do not fall before osmolality returns to normal. Oropharyngeal factors, therefore, may not be as important in vasopressin release in horses as in other species.

Keywords

Horses
Thirst
Drinking
Vasopressin
Water intake
Dehydration
Osmotic pressure
Oropharyngeal

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