Fig. 2

Effects of EO treatment on hypothalamic and pituitary hormones (n = 6). CK, a basal diet and EO, the same diet supplemented with 20 g per steer/day oregano essential oil; TRH: thyrotropin releasing hormone, GHRH: growth hormone releasing hormone, GH: growth hormone, and TSH: thyroid stimulating hormone; * indicates P ≤ 0.05 and ** indicates P ≤ 0.01