The invention discloses a method and feed for estimating the optimal energy-
protein ratio, and the method comprises the following steps: (1) taking common feed
raw material corn-
soybean meal as basic ration, and blending
bran and
soybean oil into compound feed with different
metabolic energy AME levels; (2) crushing and uniformly mixing all the raw materials, adding 5% of water, and granulating for later use; (3) adopting a single-factor complete random
test design, and selecting healthy test ducks for feeding; (4) calculating the production performance in the feeding stage; at the end of the test, at least one duck with the weight close to the average weight is selected for a slaughtering test every time, and the slaughtering performance is measured;
plasma is collected, and glutamic-pyruvic
transaminase AST and glutamic oxalacetic
transaminase AST are measured. And (5) calculating the optimal energy
protein ratio according to a linear broken line regression model (y = l + u * (r-x)). According to the method, the optimal energy-
protein ratio is estimated by establishing the regression model of the energy-protein ratio, the production performance and the slaughter performance, the result is more accurate, the application value is higher, and efficient utilization of feed resources is achieved.