Mineral concentrations in milk from cows fed seaweed (Saccharina latissima) under different basal protein supplementation
2023
Qin, Nanbing | Pétursdóttir, Ásta H. | Humphries, David J. | Desnica, N. | Newton, Eric E. | Vanhatalo, A. | Halmemies-Beauchet-Filleau, A. | Bell, Luke | Givens, D. Ian | Juniper, Darren T. | Gunnlaugsdóttir, H. | Stergiadis, Sokratis
Sixteen multiparous Holstein cows in four blocks of 4 × 4 Latin square over 4-week experimental periods were used to study the effects of seaweed (Saccharina latissima) supplement (with/without) and protein source (rapeseed meal (RSM)/wheat distiller’s grain (WDG)) on milk mineral concentrations. Dietary treatments did not affect milk production and basic composition. Feeding seaweed slightly decreased milk Ca and Cu concentrations; whilst increased (by 3.3-fold) milk iodine (I) concentration, due to a higher dietary I supply. Substitution of WDG with RSM increased feed-to-milk transfer of Ca, Na, and Se and decreased that of Mg, P, Fe, and Mn; but only reduced milk Mn and I concentrations (the latter by 27% as a potential result of increased glucosinolate intake). Seaweed supplement can improve milk I content when cows’ I supply/availability is limited, but care should be taken to avoid excess milk I contents that may pose nutritional risks for young children.
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