In vivo and in vitro investigations for nutrient digestibility and heat production of ruminants under heat stress and different nutritional levels, 5: Comparison of in vivo and in vitro investigations with respect to energy metabolism and energy content of the rations

calor chaleur concentrates digestibilidad digestibility energy metabolism energy value environmental temperature estres feeding level fermentation gases gaz heat in vitro experimentation in vivo experimentation metabolismo energetico niveau d'alimentation nivel alimenticio nutrientes nutrients ovin ovinos piensos concentrados raciones ration rations rumen sheep stress substance nutritive temperatura ambiente thermoregulation