Summary
This two-experiment study evaluated how trace mineral source—sulphate versus hydroxyl formulations—affects rumen fermentation and mineral bioavailability in feedlot steers supplemented with copper, manganese, and zinc. Whilst nutrient digestibility was unaffected by mineral source, hydroxyl-supplemented steers exhibited altered volatile fatty acid profiles with greater propionate and lower butyrate proportions. Mineral solubility and release patterns differed significantly between sources, with hydroxyl-dosed steers showing greater copper and zinc release but lower manganese release from ruminal digesta.
Regional applicability
These findings are applicable to UK intensive cattle finishing systems, where trace mineral supplementation is standard practice. The results may inform formulation choices for feedlot operations and integrated livestock production systems, though UK grazing-based systems may require separate investigation of mineral bioavailability.
Key measures
Ruminal molar proportions of propionate and butyrate; ruminal-soluble Cu, Mn, and Zn concentrations; mineral release from digesta; nutrient digestibility; rumen fermentation characteristics
Outcomes reported
The study compared sulphate and hydroxyl trace mineral sources on nutrient digestibility, rumen volatile fatty acid profiles, and trace mineral solubility in feedlot steers. Measurements included ruminal molar proportions of volatile fatty acids, rumen-soluble mineral concentrations, and mineral release from ruminal digesta.
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