Incremental amounts of Ascophyllum nodosum meal do not improve animal performance but do increase milk iodine output in early lactation dairy cows fed high-forage diets

This study evaluated the effects of increasing levels of Ascophyllum nodosum meal on milk production, nutrient utilization, and metabolic responses in early-lactation dairy cows.
The results showed that supplementation did not affect milk yield, milk composition, or overall animal performance.  However, it had a pronounced effect on iodine transfer: both milk iodine concentration and daily iodine output increased linearly with increasing supplementation levels.
Additional observations included reduced plasma nonesterified fatty acids (NEFA), indicating improved energy status, and a trend toward lower cortisol, suggesting potential metabolic or stress-related benefits.
The study highlights the importance of careful formulation, as the high iodine content of seaweed can significantly influence milk composition.