The absorption of phosphate from the digestive tract of ruminant animals

Care, A. D.

doi:10.1016/s0007-1935(05)80227-1

Cited by 35 publications

(37 citation statements)

References 29 publications

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“…However, these mechanisms are probably comparable to those of other species [8,9]. Phosphorus has been reported to be rapidly absorbed as shown in dogs by enrichment of the blood with radioactive phosphorus, 5 minutes after duodenal infusion [10].…”

Section: The Mechanisms and Sites Of Phosphorus Absorptionsupporting

confidence: 55%

II. Quantitative aspects of phosphorus absorptionin ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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-Phosphorus absorption in ruminants was analysed from a database described in a previous article. For common values of ingested phosphorus (2.5-5.0 g·kg -1 of DM), 0.73 of dietary phosphorus is absorbed. The remaining variability is probably due to phosphorus quality. Phosphorus absorbed from silage, cereal, cereal by-products and hay differs greatly. The current true absorption coefficient used to calculate daily phosphorus supply is a constant value in the current systems and often it underestimates the true absorption resulting in an excess of phosphorus being supplied in the diets. Adjusting the true absorption coefficient values requires better characterisation of the phosphorus supplied by each feedstuff. Dietary influences (phytate phosphorus, crude fibre, etc.) were investigated but trials assessing the ration effect on phosphorus absorption are lacking. Since rumen microbes have specific phosphorus requirements, particularly for cell-wall degradation, the feedstuff phosphorus availability for the rumen ecosystem is discussed.absorption / availability / phosphorus / quantitative aspect

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Section: The Mechanisms and Sites Of Phosphorus Absorptionsupporting

confidence: 55%

II. Quantitative aspects of phosphorus absorptionin ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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“…The higher P digestibility on the lower P diet is consistent with previous studies . It has been shown that when the supply of P exceeds requirements, the efficiency of P absorption is reduced (Care 1994). suggested that a P digestibility of less than 40% was indicative of surplus dietary P. The apparent P digestibility of 30% in the current study, therefore, implies that the 0.36% P diet might have been supplying more P than the animals' requirement.…”

Section: Mots Clésmentioning

confidence: 51%

Phosphorus status of lactating dairy cows fed total mixed rations containing 0.24% vs. 0.36% phosphorus

Shore¹,

Odongo²,

Mutsvangwa³

et al. 2005

Can. J. Anim. Sci.

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. W. 2005. Phosphorus status of lactating dairy cows fed total mixed rations containing 0.24% vs. 0.36% phosphorus. Can. J. Anim. Sci. 85: 409-412. The effect of dietary P content on P balance was evaluated using 14 lactating dairy cows fed a corn silage based total mixed ration (TMR) containing either 0.24% P or 0.36% P. The animals were paired by calving date at dry-off with one cow from each pair randomly assigned to either dietary treatment. All cows were fed a common TMR containing 0.34% P prepartum, and then 0.41% P for 2 wk postpartum. Experimental diets were fed from 3 to 13 wk postpartum. Phosphorus balance was conducted at week 13 postpartum. Cows fed 0.36% P diet consumed more (P < 0.05) P than the 0.24% P diet cows (69.2 vs. 50.9 g d -1 ) and excreted more (P < 0.05) P in the faeces (49.1 vs. 25.7 g d -1 ). Phosphorus digestibility was lower (P < 0.05) for the 0.36% P diet than the 0.24% P diet (29.0 vs. 48.8%). Dry matter intake and milk yield were not (P > 0.05) affected by treatments. These results suggest that short-term P balance in lactating dairy cows can be maintained on a diet supplying 26% below National Research Council 2001 recommendations of P while reducing the amount of P excreted into the environment. Can. J. Anim. Sci. 85: 409-412. Les auteurs ont évalué l'incidence de la concentration de P dans les aliments sur 14 vaches laitières en lactation nourries d'une ration mixte complète (RMC) à base d'ensilage de maïs renfermant 0,24 % ou 0,36 % de P. Les animaux ont été appariés selon la date de vêlage au tarissement et une vache de chaque couple a été affectée au hasard à l'un des deux traitements. Les vaches ont toutes reçu la RMC enrichie de 0,34 % de P avant la mise bas, puis de 0,41 % de P au cours des deux semaines suivant le vêlage. Les rations expérimentales ont été servies de la 3 e à la 13 e semaine après la mise bas. Le bilan de phosphore a été établi la 13 e semaine suivant le vêlage. Les vaches qui recevaient 0,36 % de P ont absorbé plus de P (P < 0,05) que celles en recevant 0,24 % (69,2 c. 50,9 g par jour) et en ont excrété davantage (P < 0,05) dans leurs fèces (49,1 c. 25,7 g par jour). La digestibilité du P était plus faible (P < 0,05) avec la ration en contenant 0,36 % qu'avec celle en renfermant 0,24 % (29,0 c. 48,8 %). L'ingestion de matière sèche et le rendement laitier ne sont pas affectés (P > 0,05) par le traitement. Les résultats laissent croire qu'à court terme, on peut maintenir le bilan du P chez les vaches laitières en lactation avec une ration renfermant 26 % moins de P que la concentration recommandée par le Conseil national de recherches en 2001 et réduire par la même occasion la quantité de P excrétée dans l'environnement. Mots clés:Bilan du phosphore, vaches laitières, lactation, besoins en phosphore Reducing excessive intake of dietary P in dairy cattle can significantly reduce P excretion in the faeces, which can subsequently reduce the impact that application of dairy cow excreta has on soil P content and the potential for P leaching into waterways (Va...

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“…Salivary Pi has 2 major functions: 1) acts as a buffer in the rumen, 2) provides adequate P for rumen microbes (Cohen, 1990). Salivary secretions of P constitute about 80% of the endogenous P recycled to the gastrointestinal tract (the balance is mainly from bile), depending on dry matter intake (DMI), usually combined with P intake, and the fiber content of the diet (Care, 1994). The daily secretion rate between 5 and 10 g Pi in sheep and between 30 and 60 g Pi in cows is achieved by both the high salivary flow-rate and the ability of the salivary glands to concentrate Pi 3-8 folds in comparison with plasma Pi (Breves and Schroder, 1991;Karn, 2001).…”

Section: P In Salivamentioning

confidence: 99%

“…Inorganic P sources which are water soluble are available for absorption in ruminant, while the solubility of P in organic compound depends upon the ability of e animal to convert organic into inorganic form or more acceptable organic form (Underwood and Suttle, 1999). In rumen, micobes secrete phytase enzymes which hydrolysed the phytate P and released inorganic P. The organic P which is not hydrolysed in rumen becomes soluble in low pH of abomasums (Breves and Schroder, 1991;Care, 1994). Under certain circumstances like formaldehyde or heat treatment of seeds, there is decrease in the efficiency of phytase activity as phytate P become inaccessible to phytase or there is saturation of rumen phytase by large amounts of dietary phytate P (Pfeffer, 1995;Park et al, 1999).…”

Section: P Metabolism In Dairy Animalsmentioning

confidence: 99%

“…It is primarily absorbed in the small intestine mainly in duodenum and jejunum (Reinhardt et al, 1988;Care, 1994), but the relationship between P intake and P absorption is still inconclusive whether it is inverse relationship or curvilinear . Furthermore, only a small amount of P is absorbed from rumen, omasum and abomasums which still need to be researched thoroughly (Breves and Schroder, 1991).…”

Section: P Metabolism In Dairy Animalsmentioning

confidence: 99%

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