Journal
BRITISH POULTRY SCIENCE
Volume 58, Issue 6, Pages 687-693Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00071668.2017.1363871
Keywords
Crude protein; lipid; Pekin duck; requirement; threonine
Categories
Funding
- earmarked fund for China Agriculture Research System [cars-42]
- science and technology innovation project of the Chinese Academy of Agricultural Sciences [cxgc-ias-09]
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1. This study was conducted to investigate the efficiency of threonine (Thr) supplementation on reducing dietary crude protein (CP) content and the effects of Thr on lipid metabolism in Pekin ducks. The effects of dietary CP concentration (160, 190 and 220g/kg) and Thr supplemental concentration (0, 0.7, 1.4, 2.1 and 2.8g/kg) on growth performance, carcass, liver lipid and plasma profiles were determined in Pekin ducks from 1-21 d of age.2. A total of 720-d-old male Pekin ducks were randomly allotted to 1 of 15 dietary treatments with 6 replicate cages of 8 birds per cage for each treatment according to average body weight.3. Dietary Thr supplementation improved growth performance and breast muscle percentage at all CP diets, and ducks fed Thr-supplemented diets had higher plasma concentrations of some plasma amino acids. Thr supplementation reduced the concentrations of total lipid, triglyceride, cholesterol in liver, and plasma low density lipoprotein cholesterin concentration at 160 and 190g/kg CP, whereas it increased triglyceride concentration at 160g/kg CP.4. Thr requirements based on quadratic broken-line model estimation were 6.6 and 7.0g/kg for optimal average daily gain (ADG), and 6.7 and 7.3g/kg for breast muscle percentage of Pekin ducks from 1-21 d of age at 190 and 220g/kg CP, respectively. The dietary Thr requirements and estimated ADG (55.18 vs. 55.86g/d/bird) and breast muscle percentage (2.79% vs. 2.75%) of Pekin ducks did not differ between 190 and 220g/kg CP according to the t-test results.5. Dietary CP level could be reduced to 190g/kg in Pekin ducks from 1-21 d of age with Thr supplementation to balance dietary amino acids, and Thr supplementation prevented excess liver lipid deposition in this instance.
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