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Multiparous Holstein cows (n=717) from two dairy farms were blocked at calving by parity and previous lactation milk yield and, within each block, randomly assigned to one of two treatments: a diet containing no yeast culture (Control; n=359) or 30g/d of a culture of Saccharomyces cerevisiae (YC; n=358) from 20 to 140d postpartum. Only cows calving during months of heat stress, May–August were enrolled...