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Media type:
E-Article
Title:
Effects of feeding frequency and voluntary salt intake on fluid and electrolyte regulation in athletic horses
Contributor:
Jansson, Anna;
Dahlborn, Kristina
Published:
American Physiological Society, 1999
Published in:
Journal of Applied Physiology, 86 (1999) 5, Seite 1610-1616
Language:
English
DOI:
10.1152/jappl.1999.86.5.1610
ISSN:
8750-7587;
1522-1601
Origination:
Footnote:
Description:
The effect of feeding frequency and voluntary sodium intake (VSI) on fluid shifts and plasma aldosterone concentration (PAC) were studied at rest and after exercise in six athletic horses. The horses were fed twice a day (2TD) and six times a day (6TD) for 25 days for each protocol, according to a changeover design. VSI was measured by weighing each horse’s salt block daily. Feeding 2TD or 6TD caused no major alterations in fluid shifts, but in the 2TD treatment there was a postprandial increase in plasma protein concentration and osmolality that lasted <1 h. PAC and VSI were not affected by feeding frequency. VSI ranged from 0 to 62 mg ⋅ kg body weight−1⋅ day−1and caused significant alterations in PAC. At VSI <26 mg ⋅ kg body weight−1⋅ day−1, a diurnal rhythm for PAC was noted. Water intake, fecal concentrations of sodium and potassium, and packed cell volume during exercise were influenced by VSI. The response to exercise did not differ between treatments. In conclusion, VSI, but not feeding frequency, has significant effects on fluid and electrolyte regulation in athletic horses.