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http://acervodigital.unesp.br/handle/11449/66263
- Title:
- A kinetic model of phosphorus metabolism in growing goats
- Ctro. de Ener. Nucl. Na Agricultura
- University of Reading
- Camp. Universitário de Socopo
- Univ. Federal Rural de Pernambuco
- Universidade Estadual Paulista (UNESP)
- 0021-8812
- The effect of increasing phosphorus (P) intake on P utilization was investigated in balance experiments using 12 Saanen goats, 4 to 5 mo of age and weighing 20 to 30 kg. The goats were given similar diets with various concentrations of P, and 32P was injected to trace the movement of P in the body. A P metabolism model with four pools was developed to compute P exchanges in the system. The results showed that P absorption, bone resorption, and excretion of urinary P and endogenous and fecal P all play a part in the homeostatic control of P. Endogenous fecal output was positively correlated to P intake (P < .01). Bone resorption of P was not influenced by intake of P, and P recycling from tissues to the blood pool was lesser for low P intake. Endogenous P loss occurred even in animals fed an inadequate P diet, resulting in a negative P balance. The extrapolated minimum endogenous loss in feces was .067 g of P/d. The minimum P intake for maintenance in Saanen goats was calculated to be .61 g of P/ d or .055 g of P/(kg.75·d) at 25 kg BW. Model outputs indicate greater P flow from the blood pool to the gut and vice versa as P intake increased. Intake of P did not significantly affect P flow from bone and soft tissue to blood. The kinetic model and regressions could be used to estimate P requirement and the fate of P in goats and could also be extrapolated to both sheep and cattle.
- 1-Oct-2000
- Journal of Animal Science, v. 78, n. 10, p. 2706-2712, 2000.
- 2706-2712
- Goats
- Metabolism
- Mineral Absorption
- Phosphorus
- Simulation Models
- phosphorus
- animal
- animal food
- biological model
- cattle
- chemistry
- eating
- feces
- female
- goat
- growth, development and aging
- kinetics
- male
- metabolism
- Animal Nutrition Physiology
- Animals
- Cattle
- Eating
- Feces
- Female
- Kinetics
- Male
- Models, Biological
- http://www.journalofanimalscience.org/content/78/10/2706.long
- Acesso aberto
- outro
- http://repositorio.unesp.br/handle/11449/66263
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