Response of turkey pectoralis major muscle satellite cells to hot and cold thermal stress: Effect of growth selection on satellite cell proliferation and differentiation

Satellite cell (SCs), the main progenitors for post-hatch poultry muscle growth, has maximal mitotic activity and sensitivity to temperature during first week after hatch. The objective of present study was determine effect hot cold temperatures on proliferation differentiation SCs from pectoralis major (P. major) fast-growing 1-week-old Nicholas commercial (NC) turkeys compared Randombred Control Line 2 (RBC2) representing 1966. Three regimens were used: at 38 °C (control) with 43° or 33 °C; both 43°, 38°, 33°C. increased 43 decreased in lines. When a thermal challenge administered proliferation, greater stimulatory suppressive effects observed if applied only Expression myoblast determination protein 1 showed higher increase NC line RBC2 °C. Increased myogenin expression all treatment groups but throughout differentiation. Cold suppressed independent line. These results suggest turkey P. are more sensitive environmental growth-selected stress turkeys.