1. An experiment was performed with growing broiler @entity1573 (14 to 21 d old) to examine 3 diet characteristics which have been implicated in regulatory elevation of metabolic rate: an imbalanced @entity535 mixture, high dietary energy concentration and low protein concentration. 2. Differences in energy expenditure could be explained almost entirely (93%) by differences in quantities, and therefore costs, of protein and fat accretion. There was no indication of regulatory diet-induced thermogenesis. Heat production was not significantly correlated with @entity2723 : @entity14323 ratio and was negatively correlated (P < 0.01) with dietary @entity14323 concentration. 3. Heat production was closely correlated (P < 0.001) with rate of protein accretion, which in turn was more strongly associated with intake of the first-limiting @entity535 ( @entity376 ) than with total protein intake. Heat production on an imbalanced, @entity376 -limited, @entity535 mixture was no greater than on a balanced @entity535 source with the same @entity376 concentration. 4. There was no indication of a stimulation of heat production by excess @entity1522 . Heat production, adjusted for body weight by covariance analysis, was similar on paired diets which had identical @entity376 concentrations but a 1.5- or 2-fold difference in crude protein concentration. 5. There was a strong negative correlation (P < 0.001) between protein retention per g of @entity376 consumed and @entity376 : @entity2723 ratio, suggesting that, in this case, response to a limiting @entity535 was improved by the presence of a super-abundance of other @entity1522 .

Effects of XXXX balance and energy:protein ratio on energy and nitrogen metabolism in male broiler @entity1573 .

@entity1522 :: ('CHEBI:33709', 'Chemical') :: ['amino acids'] @entity535 :: ('CHEBI:33704', 'Chemical') :: ['amino acid'] @entity14323 :: ('100309741(Tax:9031)', 'Gene') :: ['TME'] @entity1573 :: ('9031', 'Species') :: ['chickens'] @entity376 :: ('CHEBI:25094', 'Chemical') :: ['lysine'] @entity2723 :: ('MESH:C566991', 'Disease') :: ['CP']
@entity535 :: (CHEBI:33704,Chemical) :: ['amino acid']
