“…Similarly, May and McNaughton () also reported that supplemental AA (1,000 mg/kg diet) did not affect thyroid hormones secretion in broiler chickens. Conversely, the serum thyroid hormones levels were greater with supplemental AA in broiler chickens (Abdel‐Wahab, Abdo, Megahed, Attia, & Farahat, ; Sahin, Sahin, & Kucuk, ), guinea pigs (Degkwitz, ) and Japanese quails (Sahin, Kucuk, Sahin, & Sari, ). These results indicate that the influence of AA on thyroid activity remains uncertain, which may be related to animal species, animal health status, dietary composition and feeding environment.…”