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Representatives from 16 COST countries were asked to estimate daily gains in bulls, steers and heifers fed five different rations at 200 ans 400 kg respectively. The 5 X 2 rations were formulated from six different feeds of known chemical composition and digestibilities. The expected daily gains vary from country to country, and differences between countries are especially large at low levels of feeding. The differences are due to differences in breeds, the relative energy value of the feeds, and differences in the energy recommendations. Furthermore, the expected differences in gain between the sexes are highly variable. A relative feed conversion ratio was estimated at various levels of feeding. In most countries it is expected that the feed conversion ratio (energy intake/kg gain) increases at decreasing levels of feeding in bulls, steers and heifers. Furthemore, the feed conversion ratio at increasing liveweights also shows some variation.

Expected growth rates according to energy systems for cattle