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Effect of temperature-humidity index (THI) on stress hormones of Holstein lactating cows: (A) cortisol, (B) epinephrine, (C) triiodothyronine, (D) thyroxine. LTHI = low THI; MTHI = moderate THI; HTHI = high THI. Values with different letters (a, b, c) differ (P < 0.05).
