Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525586
Title Over de osmotische waarde en de gehalten aan enige opgeloste bestanddelen van de darminhoud en de mest bij het rund, in verband gebracht met de resorptie der mineralen
Author(s) Weerden, E.J. van
Source University. Promotor(en): E. Brouwer. - Wageningen : Veenman - 99
Publication type Dissertation, internally prepared
Publication year 1959
Keyword(s) rundvee - diervoeding - cattle - animal nutrition
Categories Cattle
Abstract Osmotic pressure of the contents from various parts of the gut was related to the concentrations of Ca, Mg, NH 4+, Na, K, Cl, total carbonic acid, inorganic phosphate, sulphate and steam-volatile fatty acids in press-juice of gut contents and faeces of 16 cows.
Abomasal contents were slightly hypotonic to the blood. The most important osmotically-active elements were Na and Cl.

In the upper ileum the chyme was strongly hypertonic largely through organic non-electrolytes but also Na and Cl.

Distally in the small intestine osmotic pressure gradually decreased and in the caecum they were almost isotonic with the blood, largely through Na and, to a lesser extent, K and NH 4+.

Strong selective absorption of Na against a concentration gradient caused the hypotony of colonic contents and faeces. Re-absorption from the large intestine was important in the Na metabolism of the cow.
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