MATERIALS METHODS EVERYDAY PHYSLOGICAL EVENTS causg significant diurnal variatn of the mammalian aldosterone (RAAS) clude I) changes body positn (humans), 2) exercise, 3) meal gestn (3, 5-7, 26). It is sufficiently documented humans that assumptn of an upright posture, e.g., gog from a supe to stg positn, causes a significant crease plasma ren activity (PRA), which is followed by an crease plasma aldosterone concentratn (7, 26). both humans , strenuous exercise is also a recognized stimulus of ren activity aldosterone concentratn (7, 12, 14, 24). Little vestigatn, however, has focused on the effect of meal gestn on this R524 0363-6119/B $1.50 Copyright Animals housg. Seven mature, grade s (two geldgs five nonpregnant mares) were studied. The group ranged weight from 384-516 kg age from 3-8 yr. All had normal physical examatns were treated for testal parasites 2 wk before experimentatn. The s were housed dividual, door 4 x 4-m stalls where ambient temperature was mataed at 70 t 5OF. A 12:12 light-dark terval was mataed; however, mimal lightg was necessary durg the night samplg times. Diet automatic feeders. All s were fed a pelPhyslogical Society 1988 the American R525 leted, hay-gra ratn from a sgle lot number (90%
AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society
Published: Mar 1, 1988
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