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(A) Plasma luteinizing hormone (LH), (B) follicular stimulating hormone (FSH), and (C) estradiol (E2) levels of laying hens exposed to different temperatures and ammonia concentrations at 22, 26, 30, 34, and 38 wk of age. Data represent mean ± SE. a–dValues marked with different letters are significantly different (P < 0.05).
