Effects of phosphorus intake on phosphorus flow in growing pigs: Application and comparison of two models

Schulin-Zeuthen, M.; Lopes, João Batista; Kebreab, E.; Vitti, Dorinha Miriam Silber Schmidt; Abdalla, Adibe Luiz; Haddad, M.DeL.; Crompton, L.A.; France, J.

doi:10.1016/j.jtbi.2005.02.021

Cited by 5 publications

(8 citation statements)

References 15 publications

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“…All pigs received 7 diets (based on barley and soybean) during their life span to maximize growth based on Danish standards (Table 1). The pigs were raised between (Schulin-Zeuthen, 2000Schulin-Zeuthen and Danfaer, 2001).…”

Section: Data Sourcesmentioning

confidence: 99%

“…Growth functions can be grouped into 3 categories: those that represent diminishing returns behavior (e.g., monomolecular), sigmoidal behavior with a fixed point of inflection (e.g., Gompertz, logistic), and those encompassing sigmoidal behavior with a flexible point of inflection (e.g., Richards, von Bertalanffy). The flexible functions are often generalized models that encompass simpler 1 Schulin-Zeuthen, (2000); 911 Birth to 1,007 (Landrace × Yorkshire) DM 89.9, dCP 14.3, NE 9.26, Schulin- Zeuthen and Danfaer (2001) × Duroc P 0.586, aP 0.378 DM 89.6, dCP 13.1, NE 9.11, P 0.551, aP 0.317 DM 88.9, dCP 11.9, NE 8.96, P 0.517, aP 0.256 DM 88.2, dCP 12.7, NE 8.49, P 0.507, aP 0.241 DM 89.0, dCP 11.2, NE 8.18, P 0.497, aP 0.244 DM 88.8, dCP 10.7, NE 7.87, P 0.458, aP 0.224 DM 88.4, dCP 9.56, NE 7.87, P 0.450, aP 0.224 2 Jondreville et al (2004); 209 68 to 210 (Large White × Landrace) DM 89.6, CP 20.0, NE 9.55, Tibau et al (2002) × CP = 6.25 × N (NRC, 1998), dCP = digestible protein, NE (MJ/kg) = 7.72 Scandinavian Feed Units (Andersen and Just, 1983), NE = 0.75 digestible energy (Andersen and Just, 1983), and aP = available phosphorus. models for particular values of certain additional parameters.…”

Section: Introductionmentioning

confidence: 99%

“…It is useful to examine intake in order to assess genetic improvements (Bermejo et al, 2003) or to increase return over feed costs. Phosphorus is an essential nutrient that has received attention for environmental reasons such as limited supply and pollution of ponds and streams (Schulin-Zeuthen et al, 2005). Therefore, optimizing of P intake and understanding factors affecting P utilization in pigs have environmental and economic benefits.…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of mathematical functions to describe growth and efficiency of phosphorus utilization in growing pigs1

Kebreab

Schulin-Zeuthen

López

et al. 2007

Journal of Animal Science

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Success of pig production depends on maximizing return over feed costs and addressing potential nutrient pollution to the environment. Mathematical modeling has been used to describe many important aspects of inputs and outputs of pork production. This study was undertaken to compare 4 mathematical functions for the best fit in terms of describing specific data sets on pig growth and, in a separate experiment, to compare these 4 functions for describing of P utilization for growth. Two data sets with growth data were used to conduct growth analysis and another data set was used for P efficiency analysis. All data sets were constructed from independent trials that measured BW, age, and intake. Four growth functions representing diminishing returns (monomolecular), sigmoidal with a fixed point of inflection (Gompertz), and sigmoidal with a variable point of inflection (Richards and von Bertalanffy) were used. Meta-analysis of the data was conducted to identify the most appropriate functions for growth and P utilization. Based on Bayesian information criteria, the Richards equation described the BW vs. age data best. The additional parameter of the Richards equation was necessary because the data required a lower point of inflection (138 d) than the Gompertz, with a fixed point of inflexion at 1/e times the final BW (189 d), could accommodate. Lack of flexibility in the Gompertz equation was a limitation to accurate prediction. The monomolecular equation was best at determining efficiencies of P utilization for BW gain compared with the sigmoidal functions. The parameter estimate for the rate constant in all functions decreased as available P intake increased. Average efficiencies during different stages of growth were calculated and offer insight into targeting stages where high feed (nutrient) input is required and when adjustments are needed to accommodate the loss of efficiency and the reduction of potential pollution problems. It is recommended that the Richards and monomolecular equations be included in future growth and nutrient efficiency analyses.

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Section: Data Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of mathematical functions to describe growth and efficiency of phosphorus utilization in growing pigs1

Kebreab

Schulin-Zeuthen

López

et al. 2007

Journal of Animal Science

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“…The Vitti-Dias model was built on the assumption that all P was accounted for in the calculations, considering a single input through dietary intake and that no P disappeared from the system, except from defined exits (faeces and urine). The Vitti-Dias model is formulated using rate :state principles, is dependent on SRA measurements and has been demonstrated as applicable to both goats (Vitti et al 2000) and pigs (Schulin-Zeuthen et al 2005). There is no reported information on the actual values of exchanges of P between plasma and bone or soft tissue that could be compared with the present values obtained using isotopic tracer methodology and applying the Vitti-Dias model.…”

Section: Model Performancementioning

confidence: 99%

Application of a kinetic model to describe phosphorus metabolism in pigs fed a diet with a microbial phytase

Dias

López

Moreira³

et al. 2010

J. Agric. Sci.

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SUMMARYThe objective of the current study was to apply the Vitti–Dias model to investigate phosphorus (P) metabolism in growing pigs fed a diet supplemented with microbial phytase. The basal diet contained maize, defatted rice bran, vegetable oil, soybean meal, limestone, salt and a vitamin and mineral mix. There was no inorganic P in the diet and phytase was added at levels of 253, 759, 1265 and 1748 phytase units (PU)/kg of feed. The compartmental model included four pools of P: (1) gut lumen, (2) plasma, (3) bone and (4) soft tissue. A single dose of 32P was administered, and specific radioactivity was measured in plasma, faeces, bone and soft tissue (muscle, heart, liver and kidney) at different times post-dosing for calculation of P flows between pools. Total P absorbed showed a negative relationship with total P excreted in faeces and was strongly correlated with bone P retention, suggesting that absorbed P was channelled to bone to address its physiological growth. Average efficiency of metabolic utilization of absorbed P was estimated to be 0·94, with 0·52 g/g of total net P balance being accreted in bone and the rest in soft tissue (including muscle and some vital organs). The Vitti–Dias model provided suitable representation of P interchange between compartments (in particular, flows between gut and plasma and partitioning of available P between bone and soft tissue), resulting in estimates of P flows comparable with values calculated from balance data.

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“…Esse resultado é menor do que alguns resultados relatados na literatura (Skrivanova et al, 2004;Kebreab et al, 2005 A digestibilidade do P do fitato foi maior do que a digestibilidade do P de origem diferente do fitato. Tal fato pode ser explicado se a hidrólise do P do fitato ocorreu no intestino grosso, levando a super estimativa da absorção do P do fitato, pois o P do fitato hidrolisado pode ter sido medido como P inorgânico nas fezes (Godoy and Meschy, 2001;Matsui, 2002;Shen et al, 2005).…”

Section: Cálcio E Fósforounclassified

Estudo do metabolismo do fósforo utilizando modelos matemáticos

Dias¹,

Kennedy²

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Effects of phosphorus intake on phosphorus flow in growing pigs: Application and comparison of two models

Cited by 5 publications

References 15 publications

Comparative evaluation of mathematical functions to describe growth and efficiency of phosphorus utilization in growing pigs1

Comparative evaluation of mathematical functions to describe growth and efficiency of phosphorus utilization in growing pigs1

Application of a kinetic model to describe phosphorus metabolism in pigs fed a diet with a microbial phytase

Estudo do metabolismo do fósforo utilizando modelos matemáticos

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