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Influence of ruminal water-loading on renal sodium excretion and water intake following feeding in sheep.

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Title: Influence of ruminal water-loading on renal sodium excretion and water intake following feeding in sheep.
Authors: Mathai, M. L., Thomson, C. E., Mckinley, M. J.
Source: Acta Physiologica Scandinavica. Jun2001, Vol. 172 Issue 2, p149-157. 9p. 4 Graphs.
Subjects: Water, Natriuresis, Sheep physiology, Physiological effects of sodium, Potassium, Physiology
Abstract: We investigated the effect of ruminal water loading before feeding on the natriuretic and drinking responses that follow feeding. Six sheep fed 800 g of chaff drank 1360 ± 150 mL during the 5 h immediately following feeding and increased renal Na excretion. Plasma Na concentration increased by 4 mmol L–1 and plasma osmolality by 9 mosmol kg–1 within 1.5 h and remained elevated. A rumen load of water administered before feeding prevented the increases in plasma Na and osmolality without affecting feeding. The natriuresis, water drinking and vasopressin secretion in response to feeding were abolished. Total sodium excreted during the experiment was halved in water-loaded animals compared with untreated animals (30.4 ± 2.1 mmol–1 cf. 63.8 ± 2.9 mmol–1; P < 0.01). Ruminal loading with isotonic saline caused a 33% reduction in postprandial drinking, however, reducing cerebrospinal fluid NaCl concentration abolished postprandial drinking and natriuresis. Intravenous infusion of isotonic dextran appeared to delay the onset of water intake without changing the total volume of water drunk, suggesting a role of plasma volume in initiating drinking. We conclude from the data that central osmoregulatory mechanisms that include increased sodium excretion as well as thirst and vasopressin release are activated following food intake by sheep. [ABSTRACT FROM AUTHOR]
Copyright of Acta Physiologica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Influence of ruminal water-loading on renal sodium excretion and water intake following feeding in sheep.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mathai%2C+M%2E+L%2E%22&quot;&gt;Mathai, M. L.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Thomson%2C+C%2E+E%2E%22&quot;&gt;Thomson, C. E.&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Mckinley%2C+M%2E+J%2E%22&quot;&gt;Mckinley, M. J.&lt;/searchLink&gt;
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Water%22&quot;&gt;Water&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Natriuresis%22&quot;&gt;Natriuresis&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Sheep+physiology%22&quot;&gt;Sheep physiology&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Physiological+effects+of+sodium%22&quot;&gt;Physiological effects of sodium&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Potassium%22&quot;&gt;Potassium&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Physiology%22&quot;&gt;Physiology&lt;/searchLink&gt;
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  Data: We investigated the effect of ruminal water loading before feeding on the natriuretic and drinking responses that follow feeding. Six sheep fed 800 g of chaff drank 1360 &#177; 150 mL during the 5 h immediately following feeding and increased renal Na excretion. Plasma Na concentration increased by 4 mmol L–1 and plasma osmolality by 9 mosmol kg–1 within 1.5 h and remained elevated. A rumen load of water administered before feeding prevented the increases in plasma Na and osmolality without affecting feeding. The natriuresis, water drinking and vasopressin secretion in response to feeding were abolished. Total sodium excreted during the experiment was halved in water-loaded animals compared with untreated animals (30.4 &#177; 2.1 mmol–1 cf. 63.8 &#177; 2.9 mmol–1; P &lt; 0.01). Ruminal loading with isotonic saline caused a 33% reduction in postprandial drinking, however, reducing cerebrospinal fluid NaCl concentration abolished postprandial drinking and natriuresis. Intravenous infusion of isotonic dextran appeared to delay the onset of water intake without changing the total volume of water drunk, suggesting a role of plasma volume in initiating drinking. We conclude from the data that central osmoregulatory mechanisms that include increased sodium excretion as well as thirst and vasopressin release are activated following food intake by sheep. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Acta Physiologica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1046/j.1365-201X.2001.00817.x
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 149
    Subjects:
      – SubjectFull: Water
        Type: general
      – SubjectFull: Natriuresis
        Type: general
      – SubjectFull: Sheep physiology
        Type: general
      – SubjectFull: Physiological effects of sodium
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      – SubjectFull: Potassium
        Type: general
      – SubjectFull: Physiology
        Type: general
    Titles:
      – TitleFull: Influence of ruminal water-loading on renal sodium excretion and water intake following feeding in sheep.
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            NameFull: Mathai, M. L.
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            NameFull: Thomson, C. E.
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            NameFull: Mckinley, M. J.
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            – D: 08
              M: 06
              Text: Jun2001
              Type: published
              Y: 2001
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