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DOI: 10.1055/a-1656-2610
Effekte einer oralen Mangansupplementierung mit unterschiedlichen Verbindungen auf die Mangankonzentrationen in Vollblut und Serum von Stuten und Saugfohlen
Effects of oral manganese supplementation with different compounds on the manganese whole blood and serum concentrations of broodmares and their suckling foalsZusammenfassung
Ziel Überprüfung von Effekten einer oralen Ergänzung von Mangan (Mn) auf die Mn-Konzentration im Blut laktierender Warmblutstuten und die Untersuchung der Beziehung zwischen der Mn-Versorgung der Mutterstuten und ihrer Saugfohlen.
Material und Methoden Für die 90-tägige Fütterungssphase wurden laktierende Stuten in 3 Gruppen eingeteilt und erhielten täglich ein Placebo (n = 11) oder eine Mn-Zulage von 560 mg Mn als Mn-Sulfat (n = 11) oder Mn-Chelat (n = 11) zusätzlich zur Mn-Aufnahme aus der Grundration (Heu ad libitum, Totale Mischration: Mn-Aufnahme ~100 mg/kg Trockenmasse). In 14-tägigen Abständen wurden Blutproben von den Stuten und Fohlen entnommen. Die Mn-Bestimmung im Serum und Vollblut sowie in der Stutenmilch erfolgte mittels Massenspektrometrie mit induktiv gekoppeltem Plasma, die Mn-Analyse in repräsentativen Futterproben mittels Atomabsorptionsspektrometrie. Zur Datenauswertung diente die Software IBM SPSS Statistics 27 (IBM Deutschland GmbH, Ehningen).
Ergebnisse Während der Supplementierung zeigten die Stuten im Vollblut (Median: 15,6 µg/l; 25.–75. Perzentil: 12,8–18,5 µg/l) 10-fach höhere Mn-Konzentrationen als im Serum (Median: 1,54 µg/l; 25.–75. Perzentil: 1,20–1,90 µg/l). Die Fohlen wiesen 16,4-fach höhere Mn-Konzentrationen im Vollblut (Median: 21,3 µg/l; 25.–75. Perzentil: 16,7–28,1 µg/l) im Vergleich zum Serum (Median: 1,50 µg/l; 25.–75. Perzentil: 1,30–1,70 µg/l) auf. Die Mn-Vollblutspiegel der Fohlen entsprachen der 1,6-fachen Mn-Konzentration ihrer Mutterstuten. Die Milch enthielt eine mediane Mn-Konzentration von 0,012 mg/kg Frischmasse. Die Mn-Supplementierung hatte keinen Effekt auf die Mn-Spiegel im Blut von Stuten und ihren Fohlen.
Schlussfolgerung und klinische Relevanz Die Mn-Supplementierung beeinflusste die Mn-Konzentrationen im Blut nicht, es unterschieden sich aber die Mn-Gehalte zwischen Serum und Vollblut. Ferner lagen die Mn-Spiegel im Vollblut der Fohlen höher als die der Stuten, obwohl die Mn-Konzentrationen – unabhängig von der Supplementierung – in der Stutenmilch niedrig waren. Aufgrund des geringen Mn-Gehalts der Milch ist eine Mn-Zufuhr, vorzugsweise über das Raufutter, notwendig, um die Mn-Versorgung der Fohlen sicherzustellen.
Abstract
Objective This study aimed to examine the effects of an oral supplementation on manganese (Mn) concentrations in the blood of lactating warm-blood broodmares. Furthermore, the potential relationship between Mn supply of the lactating mare and its suckling foal was investigated.
Material and methods During the 90-day trial, lactating mares were divided into 3 groups and daily received a daily dose of either a placebo (n = 11) or a Mn supplement of 560 mg Mn as Mn sulfate (n = 11) or Mn chelate (n = 11) in addition to the Mn intake from the basal ration (hay ad libitum, total mixed ration: Mn intake ~ 100 mg/kg dry matter). Blood samples were taken from the mares and their foals in 14-day intervals. The Mn determination in serum and whole blood as well as in the mare’s milk was carried out by means of mass spectrometry with inductively coupled plasma. The Mn analysis in representative feed samples was performed by means of atomic absorption spectrometry. Data were assessed using the software IBM SPSS Statistics 27 (IBM Deutschland GmbH, Ehningen).
Results During the trial period, the mares showed Mn concentrations 10-fold higher in whole blood (median: 15.6 µg/l; 25–75 percentile: 12.8–18.5 µg/l) than in serum (median: 1.54 µg/l; 25–75 percentile: 1.20–1.90 µg/l). The foals had Mn whole-blood concentrations 16.4-fold higher (median: 21.3 µg/l; 25–75 percentile: 16.7–28.1 µg/l) compared to their serum (median: 1.50 µg/l; 25–75 percentile: 1.30–1.70 µg/l). The Mn whole-blood levels of the foals corresponded to 1.6-fold the Mn concentration of their dams. The milk contained a median Mn concentration of 0.012 mg/kg fresh matter. Mn supplementation had no effect on the Mn blood levels of mares and their foals.
Conclusion and clinical relevance Blood Mn concentrations were not affected by the Mn supplementation. However, the Mn levels differed significantly between serum and whole blood. In addition, the Mn concentrations in whole blood of suckling foals were higher compared to their dams, although the Mn concentrations in the mare’s milk were low regardless of Mn supplementation. Due to the low Mn content in milk, early Mn supply, preferably by forages, is necessary to ensure that the foals are supplied with Mn according to their requirement.
Zusatzmaterial
- Zusätzliches Material finden Sie unter https://doi.org/10.1055/a-1656-2610
- Supplementary material
Publication History
Received: 11 February 2021
Accepted: 12 August 2021
Article published online:
03 December 2021
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