Study on Evaluating Net Energy of Cottonseed Meal for Cherry Valley Peking Ducks

MENG Hongmei; JIA Gang; WEN Min; ZHAO Hua; CHEN Xiaoling; LIU Guangmang; WANG Kangning

doi:10.3969/j.issn.1006-267x.2017.01.012

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 1: 97 - 105

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.01.012

POULTRY NUTRITION

Study on Evaluating Net Energy of Cottonseed Meal for Cherry Valley Peking Ducks

MENG Hongmei ,
JIA Gang ,
WEN Min ,
ZHAO Hua ,
CHEN Xiaoling ,
LIU Guangmang ,
WANG Kangning

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1. Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China;
2. Tibet Vocational Technical College, Lhasa 850000, China

Received date: 2016-06-01

Online published: 2017-01-16

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Abstract

The objective of this study was to evaluate the net energy (NE) of cottonseed meal in Cherry Valley Peking ducks, and to establish the prediction models for NE of cottonseed meal using apparent metabolizable energy (AME) and conventional composition. The factorial method was employed to evaluate the NE of cottonseed meal, and the NE of cottonseed meal was divided into NE maintenance (NEm) and NE production (NEp) which measured through regression method and comparative slaughting method, respectively. The NE of cottonseed meal was calculated by its substitution in the diet. In animal experiment, a total of 400 Cherry Valley Peking ducks were selected. Firstly, twenty ducks were selected and killed by cervical dislocation to determine both NEm and NEp according to the initial body energy of ducks at the beginning of the experiment. Secondly, fifty ducks were selected and used to measure NEm which were divided into five groups including ad libitum and 15%, 25%, 35% and 45% feed restriction groups (each group had 5 replicates and each replicate had 2 ducks), and all ducks were fed basal diet 1. The NEm was estimated by fast heat production (FHP). Thirdly, the other 330 ducks for NEp measure were divided into 33 groups (each group had 5 replicates and each replicate had 2 ducks), and fed basal diet 2 and experimental diets which used different cottonseed meals to replace 15% basal diet 2, respectively. All ducks were killed at 14 days of old by cervical dislocation to determine body energy. Finally, the AME and conventional composition of cottonseed meal were used to conduct related analysis and multiple linear stepwise regression analysis with the measured NE of cottonseed meal, and to establish the prediction models of NE for cottonseed meal. The results of this study showed as follows:the FHP of Cherry Valley Peking ducks was 580.7 kJ/(kg BW^0.75·d). The NEm and NEp of diet substituted with cottonseed meal were (2.97±0.15) MJ/kg and (5.22±0.12) MJ/kg, respectively. The NE of diet substituted with cottonseed meal was (8.19±0.09) MJ/kg. The cottonseed meal was calculated to be (6.12±0.6) MJ/kg of NE and (10.05±1.02) MJ/kg of AME. The efficiency of AME translate to NE for cottonseed meal was (60.97±2.04)%. The best prediction model established by AME and conventional composition was NE=3.276+0.241AME+0.044CP-0.081ADF (R²=0.954,RSD=0.13 MJ/kg,P<0.01), in the formula, CP was crude protein and ADF was acid detergent fiber. It is concluded that the NE of cottonseed meal for Cherry Valley Peking ducks is (6.12±0.62) MJ/kg ranged from 5.04 to 7.30 MJ/kg, and the variation is higher. The NE of cottonseed meal for Cherry Valley Peking ducks can be accurately predicted by AME combine with conventional composition.

Key words： cottonseed meal; net energy; ducks; conventional composition; prediction

Cite this article

MENG Hongmei , JIA Gang , WEN Min , ZHAO Hua , CHEN Xiaoling , LIU Guangmang , WANG Kangning . Study on Evaluating Net Energy of Cottonseed Meal for Cherry Valley Peking Ducks[J]. Chinese Journal of Animal Nutrition, 2017 , 29(1) : 97 -105 . DOI: 10.3969/j.issn.1006-267x.2017.01.012

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