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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of different levels of dietary calcium on calcium and phosphorus kinetics in horses

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Dorinha Miriam Silber Schmidt Vitti [1] ; Carlos Eduardo Furtado [2] ; João Batista da Silva Quadros [3] ; João Batista Lopes [4] ; Ives Cláudio da Silva Bueno [5] ; Eduardo Fernando Nozella [6] ; Patrícia Barboza de Godoy [7]
Total Authors: 7
[1] Centro de Energia Nuclear na Agricultura - Brasil
[2] Universidade Estadual de Maringá
[3] Universidade Estadual de Maringá
[4] Universidade Federal do Piauí
[5] Centro de Energia Nuclear na Agricultura - Brasil
[6] Centro de Energia Nuclear na Agricultura - Brasil
[7] Centro de Energia Nuclear na Agricultura - Brasil
Total Affiliations: 7
Document type: Journal article
Field of knowledge: Agronomical Sciences - Animal Husbandry

This experiment was carried out to study calcium (Ca) and phosphorus (P) kinetics of growing horses fed diets with different Ca levels: 0.15%, 0.45, and 0.75%, using a deterministic and compartmental model. The information on metabolism and kinetic of Ca and P in tissues was obtained by the isotopic dilution technique. Dietary Ca levels influenced Ca true absorption, showing lower value (4.97 g Ca/day) for the Ca level of 0.15%. The changes of Ca between the blood and digestive tract were lower for 0,15% Ca. The flows between the blood and bone and blood and soft tissues did not show differences between treatments, but bone and tissue balance was lower for the level of 0.15%. Dietary Ca levels influenced on P in urine and values were higher for 0.15% (2.49 g P/ The mean true P absorption was of 83%, with no differences among treatments. Bone deposition of 9.69g P/ was observed, showing that the amount of P fed was adequate in relation to the allowed amplitude for Ca:P ratio for the specie in the studied animal category. No differences between the P flows in the diverse compartments, for interference of the metabolism model. The ingestion of increasing levels of Ca affected the metabolism and the kinetic of this element, however Ca:P ratio is the predominant factor to determine the excretion, retention and absorption of Ca. The Ca deposition in bone is influenced by the amount ingested of this mineral. The P metabolism in growing horses was not affected by Ca levels. The amount of 13.4 g P/ in the diet was sufficient to maintain P metabolism at normal standard levels. (AU)

FAPESP's process: 04/14532-5 - Environmental impact of phosphorus excretion in livestock: quantitative analysis of flow phosphorus using bio-mathematical models
Grantee:Dorinha Miriam Silber Schmidt Vitti
Support Opportunities: Research Projects - Thematic Grants