Modeling digestibility of dietary phosphorus in growing and finish pigs1
| العنوان: | Modeling digestibility of dietary phosphorus in growing and finish pigs1 |
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| المؤلفون: | Vasilis Symeou, Ilias Kyriazakis, Sandra Edwards |
| المصدر: | Journal of Animal Science. 90:59-61 |
| بيانات النشر: | Oxford University Press (OUP), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Phosphorus, chemistry.chemical_element, General Medicine, Small intestine, Excretion, medicine.anatomical_structure, Animal science, chemistry, Phytase activity, Genetics, medicine, Animal Science and Zoology, Large intestine, Phytase, Digestion, Food Science, Dietary Phosphorus |
| الوصف: | Low P digestibility combined with intensive pig production can lead to water pollution. The aim of this paper was to develop a model able to represent P digestion in pigs across diets and contribute towards the reduction of P excretion. Phosphorus in plant feedstuffs includes some nonphytate P (NPP) that is readily digested but is mostly as organic phytate P (oP) that is indigestible unless it is dephosphorylated. The ability of pigs to dephosphorylate oP using endogenous phytase enzymes is limited and is a function of Ca intake. The effect of Ca (g/kg diet) on the proportion of oP dephosphorylated (kg/kg) in the small intestine (SI) and large intestine (LI) was determined as 0.26 - (0.015 × dietary Ca) and 0.69 - (0.059 × dietary Ca), respectively. The dephosphorylated oP in the LI was assumed to be indigestible and was excreted. Proportion of oP dephosphosphorylation (kg/kg) by microbial and plant phytase activity (FTU) in the stomach was estimated to be 0.56 × [1 - exp(-0.001 × FTU)] and 0.38 × [1 - exp(-0.002 × FTU)], respectively. Phosphorus digestibility (kg/kg) of NPP and dephosphorylated oP in the SI was assumed to be constant at 0.8. The model was used to predict P digestibility in 2 experiments by Stein et al. (2011) and Poulsen et al. (2010) and compare the predictions with experimental outcomes. The model successfully predicted the P digestibility to a range of dietary Ca concentrations and for 2 levels of supplementation with microbial phytase. However, the predictions overestimated P digestion systematically but always within a 10% margin of the observed values. The model could be a useful tool for formulating strategies to improve the efficiency of P digestion and reduce soluble P excretion in pigs. |
| تدمد: | 1525-3163 0021-8812 |
| DOI: | 10.2527/jas.53804 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::dc7f47b5904ab59fa3cb6164ab1b37e9 https://doi.org/10.2527/jas.53804 |
| رقم الانضمام: | edsair.doi...........dc7f47b5904ab59fa3cb6164ab1b37e9 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15253163 00218812 |
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| DOI: | 10.2527/jas.53804 |