Metabolism and Nutrition: Nutrition II
نویسندگان
چکیده
A 14-d trial was conducted to determine the effect of dietary protein concentration on performance and health in Pekin ducks during aflatoxicosis . The 4 dietary treatments were arranged in a 2 × 2 factorial with 2 CP concentration (20 and 24% on analyzed basis) with or without 0 .20 mg/kg AFB1 (0 .21 mg/kg analyzed) . Each diet was fed to 6 replicate cages per diet (6 ducks per cage) from 0 to 14 d of age . The AFB1 reduced BW gain, feed intake, and breast muscle weight by 33 to 43% (main effect P ≤ 0.0001), while high CP diet improved BW gain by 18% and breast muscle weight by 40% (main effect P ≤ 0.004). High CP diet also increased feed efficiency of the ducks by 10% (main effect P = 0 .021), but there was no significant interaction of AFB1 and CP observed for any performance measures . In addition, AFB1 reduced serum glucose, albumin, total protein, globulin, and calcium concentration (P ≤ 0.0015), while high CP diet reduced serum aspartate transaminase and increased serum uric acid concentration, yet no interaction of AFB1 and CP concentration was found for serum measures . Jejunal mucosal enzyme (sucrase and maltase) activity and pancreatic protease were not affected by dietary treatments, while amylase and lipase activities were increased by AFB1 (main effect P ≤ 0.0048). Additionally, high CP diet increased the villus height: crypt depth ratio (main effect P = 0 .023) . Results from this study indicate that 0 .2 mg AFB1/kg diet significantly impairs growth, breast muscle yield, and major serum biochemistry measures in Pekin ducks from hatch to 14 d, while higher dietary CP can significantly improve performance of the ducks regardless of aflatoxin contamination level, primarily due to improved feed efficiency.
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