Zum Phosphat‐ und Natriumstoffwechsel bei Aufzuchtkälbern

Boehncke, E.; Langner, Andreas; Weissmann, Florian

doi:10.1111/j.1439-0442.1981.tb01200.x

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…This clearly indicates that the ability to concentrate Pi compared with plasma Pi develops as a function of age, which is most likely associated to the functional development of the forestomach system, which could not be investigated in the present study. These data confirm findings by ( 19 ), however, in their study Pi concentrations were in a lower range during the first weeks of life. Therefore, further basic research could focus on the identification of potential regulatory factors which are involved in salivary Pi secretion.…”

Section: Discussionsupporting

confidence: 92%

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Postnatal development of salivary phosphate, sodium and potassium secretion in calves

Muscher-Banse,

Daenicke,

Dänicke

et al. 2023

Front. Vet. Sci.

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The transition of young lambs and calves from a non-ruminating to a ruminating animal include substantial, developmental changes to alter saliva production. Due to the simultaneous development of the forestomach system, the salivary glands must transfer more and more substances such as bicarbonate and phosphate (Pi), but also sodium (Na), into saliva in order to create and to maintain optimal environmental conditions for microbial metabolism. The objective of the present study was to characterize the effects of different dietary energy levels on the ability of the salivary glands to concentrate minerals in young ruminants in more detail during the first 7 weeks of life. Blood and saliva samples were collected from twelve female calves of the German Holstein breed fed different levels of milk replacer. Plasma and saliva samples were collected over 7 weeks postpartum and Na, Pi and potassium (K) concentrations were measured. Salivary Na and Pi concentrations (p < 0.001) increased as a function of time and were not affected by varying energy intake, while K concentration (p < 0.001) decreased over the developmental period and was also not affected by energy intake. This suggests that the ability to specifically concentrate minerals such as Na and Pi in saliva follows a genetic program in the salivary glands rather than being influenced by dietary factors such as energy intake in young ruminants.

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Section: Discussionsupporting

confidence: 92%

“…The plasma was separated by centrifugation (2000 g at room temperature, 15 min). Saliva samples were collected from conscious animals as previously described ( 19 ). The method is non-invasive and has therefore little impact on animal’s wellbeing.…”

Section: Methodsmentioning

confidence: 99%

Postnatal development of salivary phosphate, sodium and potassium secretion in calves

Muscher-Banse,

Daenicke,

Dänicke

et al. 2023

Front. Vet. Sci.

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Modulation of intestinal calcium and phosphate transport in young goats fed a nitrogen- and/or calcium-reduced diet

Elfers¹,

Wilkens²,

Breves³

et al. 2015

Br J Nutr

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Feeding ruminants a reduced N diet is a common approach to reduce N output based on rumino-hepatic circulation. However, a reduction in N intake caused massive changes in Ca and inorganic phosphate (P i ) homoeostasis in goats. Although a single dietary Ca reduction stimulated intestinal Ca absorption in a calcitriol-dependent manner, a concomitant reduction of Ca and N supply led to a decrease in calcitriol, and therefore a modulation of intestinal Ca and P i absorption. The aim of this study was to examine the potential effects of dietary N or Ca reduction separately on intestinal Ca and P i transport in young goats. Animals were allocated to a control, N-reduced, Ca-reduced or combined N-and Ca-reduced diet for about 6 − 8 weeks, whereby N content was reduced by 25 % compared with recommendations. In Ussing chamber experiments, intestinal Ca flux rates significantly decreased in goats fed a reduced N diet, whereas P i flux rates were unaffected. In contrast, a dietary Ca reduction stimulated Ca flux rates and decreased P i flux rates. The combined dietary N and Ca reduction withdrew the stimulating effect of dietary Ca reduction on Ca flux rates. The expression of Ca-transporting proteins decreased with a reduced N diet too, whereas P i -transporting proteins were unaffected. In conclusion, a dietary N reduction decreased intestinal Ca transport by diminishing Ca-transporting proteins, which became clear during simultaneous N and Ca reduction. Therefore, N supply in young ruminant nutrition is of special concern for intestinal Ca transport.Key words: Flux rates of calcium and phosphate: Goats: Na + -dependent P i transporter IIb: Transient receptor potential vanilloid channel type 6: Ussing chambersFeeding ruminants a N-reduced diet is preferable for economic and environmental reasons. Dietary crude protein (CP) concentrations of 11 − 12 % were recommended to meet the requirements of growing goats (1) . A reduced dietary N supply was associated with a significant reduction in urinary N excretion (2) due to increased expression of renal urea transporters, and thus greater renal urea re-absorption (3) in goats. In addition, the urea transporting capacity of the ruminal epithelium was increased due to dietary N reduction (4) . By possessing such efficient recycling mechanisms, ruminants such as goats are able to maintain rumen microbes' N supply, and therefore a sufficient synthesis of microbial protein as the most important source for host protein, provided that energy supply to the rumen flora is also adequate for microbial protein synthesis.As monogastric species do not have the similar potential to utilise N efficiently, a low-protein diet changes metabolic pathways seriously. A reduction of dietary protein leads to changes in Ca and inorganic phosphate (P i ) homoeostasis in monogastric animals and humans, including decrease in intestinal Ca absorption, reduced urinary Ca excretion and diminished plasma calcitriol and insulin-like growth factor 1 (IGF1) concentrations (5)(6)(7)(8) .Despite the N-rec...

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Beziehungen zwischen Harnfarbe und Kreatininkonzentration im Harn von Milchkühen

Boehncke¹,

Mergardt²,

Fricke³

et al. 1982

Zentralblatt für Veterinärmedizin Reihe A

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EinleitungAnalysen aus Einzelharnproben haben in vielen Fallen keinen oder einen nur schwer zu deutenden Aussagewert, weil die GroBe des zugehorigen Harnminutenvolumens meist nicht bestimmt werden kann. So ist nicht ohne weiteres zu entscheiden, ob 100 mMol NatriumA Harn einer hoheren Natriumausscheidung ents rechen als 20mMol/l. Andererseits konnte aber gerade der Harn als Endpro s ukt des ,,Regulationsorgans" Niere wertvolle Riickschlusse auf die Versorgungslage landwirtschaftlicher Nutztiere ermo lichen. tersuchungen seit langem als eine Art endogene Bezugssubstanz herangezogen (HODGEN u. Mitarb., 1967).In Untersuchungen an Mastkalbern konnten BOEHNCKE und RIEDER (1974) nachweisen, dai3 zwischen der Farbintensitat von Einzelharnproben und deren Kreatininkonzentration sehr enge Korrelationen ( r = 0,91 bis 0,97) bestehen. Die ,,Harnfarbe" wurde dabei nach einer einfachen Schnellmethode bestimmt.

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Zum Phosphat‐ und Natriumstoffwechsel bei Aufzuchtkälbern

Cited by 6 publications

References 13 publications

Postnatal development of salivary phosphate, sodium and potassium secretion in calves

Postnatal development of salivary phosphate, sodium and potassium secretion in calves

Modulation of intestinal calcium and phosphate transport in young goats fed a nitrogen- and/or calcium-reduced diet

Beziehungen zwischen Harnfarbe und Kreatininkonzentration im Harn von Milchkühen

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