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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0561    [Accepted] Published online November 12, 2019.
Modeling net energy requirements of 2 to 3-week-old Cherry Valley ducks
Ting Yang1  , Lexiao Yu1  , Min Wen1,2  , Hua Zhao1  , Xiaoling Chen1  , Guangmang Liu1  , Gang Tian1  , Jingyi Cai1  , Gang Jia1,* 
1Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu, 611130, China
2Tibet Vocational Technical College, Lasa, 850000, China
Correspondence:  Gang Jia,Email: jiagang700510@163.com
Received: 11 July 2019   • Revised: 17 September 2019   • Accepted: 30 October 2019
Abstract
Objective
A total of three hundred unsexed ducks were conducted to estimate net energy requirements of maintenance (NEm) and weight gain (NEg) for 2 to 3-week-old Cherry Valley ducks and to establish a model equation to predict net energy requirements using the factorial method.
Methods
To determine the apparent metabolizable energy (AME) of the diet, fifty 7-day-old ducks at approximately equal body weights (BWs) were randomly assigned into five groups that were fed at different levels (ad libitum, 85%, 75%, 65%, and 55% of ad libitum intake), and the endogenous acid-insoluble ash (AIA) as indigestible marker. The two hundred and fifty 7-day-old ducks were used for a comparative slaughter experiment. At the beginning of the experiment, ten ducks were sacrificed to determine the initial body composition and energy content. The remaining ducks were randomly assigned into five groups (same as metabolic experiment). Ducks of the ad libitum group were slaughtered at 14 and 21-day-old. At the end of the experiment, two ducks were selected from each replicate and slaughtered to determine the body composition and energy content.
Results
The results of the metabolizable experiment showed AME values of 13.43 to 13.77 MJ/kg for ducks at different feed intake. The results of the comparative slaughter experiment showed the NEm value for 2 to 3-week-old Cherry Valley ducks was 549.54 kJ/kg of BW0.75/d, and the NEg value was 10.41kJ/g. The deposition efficiency values of fat (Kf) and crude protein (Kp) were 0.96 and 0.60, respectively, and the values of efficiency of energy utilization (Kg) and maintenance efficiency (Km) were 0.75 and 0.88, respectively.
Conclusion
The equation for the prediction of NE requirements for 2 to 3-week-old Cherry Valley ducks was the following: NE = 549.54 BW0.75 + 10.41 ΔW, where ΔW is the weight gain (g).
Keywords: Duck; Net Energy Requirement; Factorial Method; Comparative Slaughter Method; Prediction Equation


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