approached significanceP = 0.053
4 D ) did not differ between treatments ( P = 0.123) and effects of litter size approached significance ( P = 0.053); transpulmonary pressure increased more in twin‐pregnant than non‐pregnant ewes ( P = 0.020) and the change in transpulmonary pressure did not differ between singleton‐pregnant ewes and other litter sizes (each P > 0.2).