Phosphate transport in the duodenum and jejunum of goats  and its adaptation by dietary phosphate and calcium

Huber, Korinna; Walter, Christina; Schröder, Bernd; Breves, Gerhard

doi:10.1152/ajpregu.00760.2001

Cited by 56 publications

(68 citation statements)

References 13 publications

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“…Furthermore, rumen microbes are able to digest phytic acid so that most of the phytate-bound P, the form of 0.35 and 0.70% of P in plants, is available for absorption in ruminants (Underwood and Suttle 2001). Low dietary P increases the P absorption rate or efficiency from the small intestine (Horst 1986;Shirazi-Beechey et al 1996;Huber et al 2002;Odongo et al 2002).…”

Section: Resultsmentioning

confidence: 99%

Long-term effects of feeding diets without mineral phosphorus supplementation on the performance and phosphorus excretion in high-yielding dairy cows

Odongo

McKnight²,

KoekKoek³

et al. 2007

Can. J. Anim. Sci.

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. W. 2007. Longterm effects of feeding diets without mineral phosphorus supplementation on the performance and phosphorus excretion in high-yielding dairy cows. Can. J. Anim. Sci. 87: 639-646. The objective of this study was to assess the long-term effects of feeding a diet with no mineral phosphorus (P) supplementation on performance and P excretion in high-yielding dairy cows. In exp. 1, 24 primiparous (PP) and 40 multiparous (MP) Holstein cows were allocated to one of two treatments at calving: (1) regular corn silage and alfalfa haylage based milking cow total mixed ration (TMR; 0.42% P diet) or (2) milking cow total mixed ration (TMR) without supplemental mineral P (0.35% P diet) in a completely randomized design. The trial lasted until after two lactations were completed or the cow was culled. In exp. 2, eight MP Holstein cows (108 ± 8.0 d in milk) were used to determine P digestibility and retention in a completely randomized block design. In exp. 1, the 0.35% P diet cows had lower body weight, body condition score and milk urea nitrogen and higher faecal P than the 0.42% P cows. The dry matter intake (DMI) of PP cows on the 0.35% P diet was lower than that of PP cows on the 0.42% P diet. There was no difference in the DMI of MP cows. The P intake of 0.35% P diet PP cows was 30% lower than that of 0.42% P diet PP cows. The P intake of 0.35% P diet MP cows was 20% lower than that of 0.42% P diet MP. The digestibility coefficient of P for the 0.35% P diet was higher than that for the 0.42% P diet. These results suggest that the forages used in the present study contained adequate amounts of P to sustain milk production in high-yielding MP cows. However, for PP cows some mineral P supplementation is recommended especially during early lactation.Key words: Phosphorus, environmental pollution, intensive dairy operations Odongo, N. E., McKnight, D., KoekKoek, A., Fisher, J. W., Sharpe, P., Kebreab, E., France, J. et McBride, B. W. 2007. Effets à long terme d'une alimentation sans supplément de phosphore minéral sur la performance des vaches laitières à rendement élevé et sur leur excrétion de phosphore. Can. J. Anim. Sci. 87: 639-646. L'étude devait évaluer les effets à long terme d'un régime non enrichi de phosphore minéral (P) sur la performance de grosses productrices de lait et sur l'excrétion de P par cellesci. Lors de la première expérience, les auteurs ont réparti entièrement au hasard 24 vaches Holstein primipares (PP) et 40 multipares (MP) entre deux traitements, au vêlage. Les traitements consistaient en 1) une ration mixte complète pour vache laitière à base d'ensilage ordinaire de maïs et de mi-fané de luzerne (TMR; régime à 0,42 % de P) ou 2) la TMR sans supplément de P minéral (régime à 0,35 % de P). L'essai a duré deux lactations ou jusqu'à la réforme de l'animal. Pour la deuxième expérience, huit vaches MP Holstein (108 ± 8,0 jours de lactation) réparties en bloc randomisé ont servi à déterminer la digestibilité et la réten-tion du P. Lors de la première expérience, les vaches recevant 0,35 % de...

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Section: Resultsmentioning

confidence: 99%

Long-term effects of feeding diets without mineral phosphorus supplementation on the performance and phosphorus excretion in high-yielding dairy cows

Odongo

McKnight²,

KoekKoek³

et al. 2007

Can. J. Anim. Sci.

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“…Dietary regulation of Pi transport and the NaPi-II transporter mRNA/protein expression in the intestine has been studied in mammals (Hattenhauer et al, 1999;Huber et al, 2000Huber et al, , 2002Katai et al, 1999) and fish (Coloso et al, 2003), but nothing was known regarding Pi transport, NaPi-II expression or their dietary regulation in PC. Since PC is a primary site of dietary nutrient absorption in trout (Buddington and Diamond, 1987), it is crucial to study its regulatory mechanism.…”

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confidence: 99%

Contributions of different NaPi cotransporter isoforms to dietary regulation of P transport in the pyloric caeca and intestine of rainbow trout

Sugiura

Ferraris

2004

Journal of Experimental Biology

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SUMMARY The anatomical proximity and embryological relationship of the pyloric caeca (PC) and small intestine of rainbow trout has led to the frequent assumption, on little evidence, that they have the same enzymes and transporters. In trout, the PC is an important absorptive organ for dietary nutrients, but its role in dietary P absorption has not been reported. We found that apical inorganic phosphate (Pi) transport in PC comprises carrier-mediated and diffusive components. Carrier-mediated uptake was energy-and temperature-dependent, competitively inhibited and Na+-independent, and greater than the Na+-dependent intestinal uptake. Pi uptake in PC was pH-sensitive in the presence of Na+. Despite the active Pi transport system in PC, high postprandial luminal Pi concentrations (∼20 mmol l–1)indicate that diffusive uptake represents ∼92% of total Pi uptake in PC of fed fish. The nucleotide sequence of a sodium-phosphate cotransporter(NaPi-II) isoform isolated from PC was ∼8% different from the intestinal NaPi cotransporter. PC-NaPi mRNA was abundant in PC but rare in the intestine,whereas intestinal NaPi mRNA was abundant in the intestine but scarce in PC. Dietary P restriction reduced serum and bone P concentrations, increased intestine-type, but not PC-type, NaPi mRNA in PC, and increased Pi uptake in intestine but not in PC. Intestine-type NaPi expression may be useful for predicting dietary P deficiency.

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“…Detection of specific amounts of AQP1 and AQP2 mRNA in caprine cortical and outer medulla tissue was performed via Northern Blot analysis as described in detail elsewhere (Huber et al 2002;Muscher et al 2008). Briefly, 5 µg poly(A) + RNA/lane isolated from renal cortex and outer medulla were fractionated in 1.0 % formamide/agarose gels and transferred by capillary blotting onto nitrocellulose membranes.…”

Section: Sampling and Plasma Analysesmentioning

confidence: 99%

Modulation of aquaporin 2 expression in the kidney of young goats by changes in nitrogen intake

Elfers¹,

Breves²,

Muscher-Banse³

2014

J Comp Physiol B

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In ruminants, a decrease of dietary nitrogen (N) is an appropriate feeding concept to reduce environmental pollution and costs. In our previous study, when goats were kept on an N-reduced diet, a decrease of plasma urea concentration and an increase of renal urea transporters were demonstrated. Renal urea absorption plays a crucial role for renal water absorption and urine concentration. Renal collecting duct water absorption is mainly mediated by the water channel aquaporin 1 and 2 (AQP1 and AQP2). Therefore, the aim of the present study was to investigate the effects of a dietary N reduction on expression of renal AQP1 and AQP2 in young goats. Twenty male White Saanen goats, 3 months old, were divided equally into two feeding groups, receiving either a diet with an adequate or a reduced-N supply. Goats fed a reduced-N diet showed significantly higher amounts of AQP1 mRNA in cortical tissue, and the expression of AQP2 mRNA and protein were highly elevated in renal outer medulla. An increase of vasopressin concentrations in plasma were detected for the N-reduced fed goats. Therefore, a stimulation of renal water absorption can be assumed. This might be an advantage for ruminants in times of N reduction due to higher urea concentrations in the tubular fluid and which might result in higher absorption of urea by renal urea transporters. Therefore, interplay of aquaporin water channels and urea transporters in the kidney may occur to maintain urea metabolism in times of N scarcity in young goats.

show abstract

Phosphate transport in the duodenum and jejunum of goats and its adaptation by dietary phosphate and calcium

Cited by 56 publications

References 13 publications

Long-term effects of feeding diets without mineral phosphorus supplementation on the performance and phosphorus excretion in high-yielding dairy cows

Long-term effects of feeding diets without mineral phosphorus supplementation on the performance and phosphorus excretion in high-yielding dairy cows

Contributions of different NaPi cotransporter isoforms to dietary regulation of P transport in the pyloric caeca and intestine of rainbow trout

Modulation of aquaporin 2 expression in the kidney of young goats by changes in nitrogen intake

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