An extended model of phosphorus metabolism in growing ruminants

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorDias, R. S.-
Autor(es): dc.creatorLópez, S.-
Autor(es): dc.creatorPatiño, R. M. P.-
Autor(es): dc.creatorSilva, T. S.-
Autor(es): dc.creatorSilva Filho, J. C.-
Autor(es): dc.creatorVitti, D. M. S. S.-
Autor(es): dc.creatorPeçanha, M. R. S. R.-
Autor(es): dc.creatorKebreab, E.-
Autor(es): dc.creatorFrance, J.-
Data de aceite: dc.date.accessioned2026-02-09T12:39:40Z-
Data de disponibilização: dc.date.available2026-02-09T12:39:40Z-
Data de envio: dc.date.issued2019-12-18-
Data de envio: dc.date.issued2019-12-18-
Data de envio: dc.date.issued2011-12-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br//handle/1/38354-
Fonte completa do material: dc.identifierhttps://academic.oup.com/jas/article-abstract/89/12/4151/4772072?redirectedFrom=fulltext-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1165761-
Descrição: dc.descriptionA major objective of this study was to extend the Vitti-Dias model used to describe P metabolism in ruminants, by adding 2 new pools to the original model to represent the rumen and saliva. An experiment was carried out using 24 male sheep, initial BW of 34.5 kg, aged 8 mo, fed a basal diet supplied with increasing amounts of dicalcium phosphate to provide 0.14, 0.32, 0.49, and 0.65% P in the diet. Sheep were individually housed indoors in metabolic cages and injected with a single dose of 7.4 MBq of 32P into a jugular vein. Feed intake and total fecal and urinary outputs were recorded and sampled daily for 1 wk, and blood samples were obtained at 5 min, and 1, 2, 4, 6, 24, 48, 72, 96, 120, 144, and 168 h after 32P injection. Saliva and rumen fluid samples were taken on d 6, 7, and 8. Then, animals were slaughtered and samples from liver, kidney, testicle, muscle, and heart (soft tissue) and bone were collected. Specific radioactivity and inorganic P were then determined in bone, soft tissue, plasma, rumen, saliva, and feces, and used to calculate flows between pools. Increased P intake positively affected total P (r = 0.97, P < 0.01) and endogenous P excretion in feces (r = 0.85, P < 0.01), P flow from plasma to saliva (r = 0.73, P < 0.01), from saliva to rumen (r = 0.73, P < 0.01), and from lower gastrointestinal tract to plasma (r = 0.72, P < 0.01). Urinary P excretion was similar for all treatments (P = 0.35). It was, however, related to plasma P (r = 0.63, P < 0.01) and to net P flow to bone (accretion – resorption; r = −0.64, P < 0.01). Phosphorus intake affected net P flow to soft tissue (P = 0.04) but not net P flow to bone (P = 0.46). Phosphorus mobilized from bone was directed toward soft tissue, as suggested by the correlations between P flow from bone to plasma and net P flow to soft tissue (r = 0.89, P < 0.01), and P flow from plasma to soft tissue and net P flow to bone (r = −0.76, P < 0.01). The lack of effect of dietary P on net P accretion in bone suggests that P demand for bone formation was low and surplus P was partially used by soft tissue. In conclusion, the model resulted in appropriate biological description of P metabolism in sheep and added knowledge of the effects of surplus dietary P on P metabolism. Additionally, the model can be used as a tool to assess feeding strategies aiming to mitigate P excretion into the environment.-
Idioma: dc.languageen-
Publicador: dc.publisherOxford Academic-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceJournal of Animal Science-
Título: dc.titleAn extended model of phosphorus metabolism in growing ruminants-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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