HBA1 and myopathy: The downregulation of three hemoglobin subunits (i.e., HBBA, HBAD, and HBA1) in 35-d chickens compared with 15-d chickens could be related to an imbalance between the muscular development of birds and the vascularization/blood supply and might reflect the possible muscle suffering that leads to muscle fiber degeneration and myopathies with the increase in age [76, 77].