[Results from measurements of nitrogen and energy metabolism in adaptive different cattle].

In experiments with Galloway (G), Highland (H) and Black-White Dairy (B) cattle no significant differences between the breeds were measured in the energy and nutrient digestibility and energy metabolizability of rations with high variation in the nutrient composition. In H and B cattle no differences existed in digestibility in relation to the environmental temperature (30, 18 and 3 degrees C). Lowering the environmental temperature from 18 to 12 and 4-6 degrees C resulted in no changes of heat production in G and H but in B heat production increased about 6% and 20% respectively.