Publikationsdatenbank

Calcium, phosphorus, zinc and copper content in commercial supplements for horses (2020)

Art

Poster

Autoren

Saliu, E. M. (WE 4)

Grześkowiak, Ł. (WE 4)

Ebersbach, L. (WE 4)

Hettmannsperger, M.

Kindler, F.

Kuhr, A.

Lorenz, M.

Lorson, S.

Mussel, R.

Zentek, J. (WE 4)

Kongress

24th ESVCN Congress

München, 17. – 19.09.2020

Quelle

Congress Proceedings : 24th Congress of the European College of Veterinary and Comparative Nutrition : September 17 - 19, 2020 — Ludwig-Maximilians-Universität München (Hrsg.)

München, 2020 — S. 69

ISBN: 978-90-90-33625-1

Sprache

Englisch

Verweise

URL (Volltext): https://www.zora.uzh.ch/id/eprint/190612/1/Congress_proceedings_2020_ffv_(4).pdf

Kontakt

Institut für Tierernährung

Königin-Luise-Str. 49
14195 Berlin
+49 30 838 52256
tierernaehrung@vetmed.fu-berlin.de

Abstract / Zusammenfassung

Introduction:
To ensure adequate diets that meet the nutrient requirements of horses.owners rely on correct declarations on feed and supplements. Severe over or under supply of macro- and micronutrients may result in health issues. The aim of this study was to determine possible discrepancies in the manufacturers’ declaration regarding calcium, phosphorus, copper and zinc concentrations in commercial supplements for horses.

Materials and methods:
Samples of 19 randomly selected commercial mineral feed products for horses were analysed in duplicates for their crude ash, calcium, phosphorus, copper and zinc content at the Institute of Animal Nutrition, Freie Universität Berlin, according to the the VDLUFA methodologies. The results were compared to the declared values. The complementary feed products where manufactured by different producers and comprised products easily accessible for German horse owners on the internet. Copper, zinc, and calcium were analysed with atomic absorption spectroscopy (AAS, contrAA 700, Analytic Jena AG, Germany). Vanadate molybdate method was used to determine the concentration of phosphorus at 436 nm (Ultrospec™ 2100 pro Amersham Biosciences, Amersham Biosciences Europe GmbH, Germany, modified after VDLUFA 10.6.1). Results were compared to the declared values considering the tolerance range and crude ash content [1,2].

Results and discussion:
Declaration of trace elements differed between total and added content depending on the manufacturer. Considering the analysed mineral concentrations, 18 out of 19 samples showed deviations from the declared values above or below the tolerance range [1] in at least one analysed parameter. There was only one product without discrepancies. Of the 18 complementary feed products which differed more or less from the declaration, nine of calcium, nine of phosphorus, seven of copper and seven of zinc concentrations were within the tolerance range. For calcium, two samples presented lower (22-63 %) and eight samples presented higher (11-45 %) concentrations, as declared by the manufacturer. Phosphorus was lower (10-66 %) as declared by the manufacturer in eight samples, while an excess (10-101 %) was observed in two samples. The calcium/phosphorus ratio based on the declared concentrations ranged from 1.4:1 to 12:1 and from 1.5:1 to 6:1 when analysed values were considered. Nine analysed copper concentrations were below (15-71 %) and three were above (41-342 %) the declared values. The same picture arose for zinc with nine lower (20-51 %) and three higher (17-
804 %) analysed concentrations, as compared to the declaration. Despite the described discrepancies, recommended feeding rates assured adequate supply of calcium, phosphorus, and cupper for a 500 kg horse fed hay from Berlin Brandenburg. However, 16/19 complementary feeds did not supply sufficient zinc. Additionally, 14 samples contained vitamins.

Conclusion: This study has shown deviations between the declared and analysed mineral concentrations in the analysed feed samples. Thus, regular and independent quality controls of supplements for horses are advised.