Representative photomicrographs of transverse section (H & E stained) of heart from 7 days old broiler of group C (A1, A2), E1 (B1, B2), E2 (C1, C2) and E3 (D1, D2). Green arrow- Myofibrillar degeneration, Black arrow- Congestion, Asterisks- Vacuolation of myofibers.