Evaluation of Metabolizable Energy and Amino Acids Nutrient Value of Different Rapeseed Meals for Daheng Broilers

ZHANG Chanjuan, WANG Jianping, DING Xuemei, ZENG Qiufeng, BAI Shiping, ZHANG Keying

doi:10.3969/j.issn.1006-267x.2018.02.022

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 2: 578 - 588

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.02.022

Molecular Nutrition

Evaluation of Metabolizable Energy and Amino Acids Nutrient Value of Different Rapeseed Meals for Daheng Broilers

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Key Laboratory of Animal Disease-Resistant Nutrition of Ministry of Education, Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2017-07-20

Online published: 2018-02-02

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Abstract

This study was conducted to evaluate metabolizable energy (ME) and amino acids nutritent value of different rapeseed meals for Daheng broilers by using true ME (TME) assay. Twelve rapeseed meal samples were collected from feed enterprises in Sichuan province and its ME and true availabilities of amino acid (TAAA) were determined. ME evaluation included 3 batches metabolic test, 48 normal broilers per batch were randomly assigned to 6 groups with 8 replicates per group and 1 chicken per replicate. TAAA evaluation included 3 batches metabolic test, 36 caecectomized broilers per batch were randomly assigned to 6 groups with 6 replicates per group and 1 chicken per replicate. An endogenous group was prepared in every batch, and 10-day recovery between each batch was set up. TME assay was used to investigate the ME, including feed withdrawal for 48 h before feeding test samples and then 2% of body weight of diets to be measured for force feeding, with 48 h of excreta collection period; whereas the group for endogenous collection was continued to fast and collected the excreta for 48 h. The results showed as follows:1) The mean contents of dry matter (DM), crude protein (CP), gross energy (GE), neutral detergent fiber (NDF), acid detergent fiber (ADF), crude fiber (CF), ether extract (EE) and ash of 12 rapeseed meal samples were 87.67%, 42.10%, 19.75 MJ/kg, 39.99%, 16.13%, 15.15%, 2.40% and 9.10%, respectively. The coefficient of variation (CV) of NDF, ADF, EE and ash were greater than 15%. 2) The means of apparent ME (AME), nitrogen corrected AME (AMEn), TME and nitrogen corrected TME (TMEn) of 12 rapeseed meal samples were 8.627, 9.029, 9.326, and 8.970 MJ/kg, respectively. There was significant difference in ME of different rapeseed meals (P<0.05). 3) The mean contents of amino acids of 12 rapeseed meal samples were ranged from 0.72% to 6.55%. The maximum CV of lysine was 18.97%. 4) The means of TAAA of 12 rapeseed meal samples were ranged from 68.37% to 88.92%. There was significant difference in TAAA of different rapeseed meals except for methionine, threonine and serine (P<0.05). The means of true availabilities of essential amino acids, non-essential amino acids and total amino acids were 70.81%, 70.43%, and 70.45%, respectively. It is concluded that:1) there are differences in AME, AMEn, TME, and TMEn of different rapeseed meals. 2) There are differences in TAAA of different rapeseed meals for Daheng broilers.

Key words： Daheng broilers; rapeseed meal; metabolisable energy; true availabilities of amino acids

Cite this article

ZHANG Chanjuan, WANG Jianping, DING Xuemei, ZENG Qiufeng, BAI Shiping, ZHANG Keying . Evaluation of Metabolizable Energy and Amino Acids Nutrient Value of Different Rapeseed Meals for Daheng Broilers[J]. Chinese Journal of Animal Nutrition, 2018 , 30(2) : 578 -588 . DOI: 10.3969/j.issn.1006-267x.2018.02.022

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