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Effects of in ovo carvacrol supplementation at embryonic day (E) 17.5 on the morphological structure of follicles in the bursa of Fabricius at hatch and d 14 (n = 10). F, follicle; C, cortex; M, medulla; CMB, cortico-medullary border. Cortex, medulla and corticomedullary border could not be distinguished at hatch. * P ≤ 0.05.
