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Weekly mean of milk yield of cows during heat stress with supplementation of a Saccharomyces cerevisiae fermentation product (SCFP) at level of 0 (○), 120 (△), or 240 (□) g/d. Pattern of milk yield was partially attributed to the thermal-humidity index fluctuations. Bars indicated standard error mean. * In the marked week (week 7), milk yield for cows fed 240 g/d SCFP tended to be greater than control cows (p = 0.07).
