Prediction Equations of Standardized Ileal Digestible Amino Acid Contents of Rapeseed Meal of Meat Ducks

ZHANG Kaixin; ZHANG Keying; DING Xuemei; BAI Shiping; WANG Jianping; PENG Huanwei; ZENG Qiufeng

doi:10.3969/j.issn.1006-267x.2020.06.025

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 6: 2663 - 2673

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.06.025

Prediction Equations of Standardized Ileal Digestible Amino Acid Contents of Rapeseed Meal of Meat Ducks

ZHANG Kaixin ,
ZHANG Keying ,
DING Xuemei ,
BAI Shiping ,
WANG Jianping ,
PENG Huanwei ,
ZENG Qiufeng

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Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Ministry of Agriculture and Sichuan Province, Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China

Received date: 2019-12-11

Online published: 2020-06-16

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Abstract

This study is conducted to establish prediction models to estimate standardized ileal digestible amino acid content in rapeseed meal for meat ducks based on chemical components, protein solubility (PS) and lysine (Lys):crude protein (CP) by stepwise regression analysis. A substitution method was used in the metabolic experiment, rapeseed meal from 22 different sources were selected, and the replacement ratio of rapeseed meal in experimental diet was 15%. A total of 1 168 one-day-old male meat ducks were randomly allotted to 23 groups (6 replicates per group, 8 ducks per replicate) and one nitrogen-free diet group (6 replicates per group, 8 ducks per replicate). Titanium dioxide (0.5%) was added in all diets as an indigestible marker. Ducks were fed experimental diets during 16 to 18 days of age, and the experiment lasted for 3 days. The results showed as follows: 1) the Lys:CP varied from 0.028 to 0.074 in 22 kinds of rapeseed meal, which increased with the PS of rapeseed meal increased. 2) The contents of standardized ileal digestible CP, essential amino acid, nonessential amino acid and total amino acid in 22 kinds of rapeseed meal were significantly different (P<0.05). 3) The content of standardized ileal digestible CP and Lys were 226.9 to 288.6 g/kg [mean value 254.6 g/kg; coefficient of variation (CV) 17.3%] and 5.61 to 18.83 g/kg (mean value 13.97g/kg; CV 30.45%). 4) The neutral detergent fiber (NDF) content (R²=0.809 2, P<0.001), Lys:CP (R²=0.948 2, P<0.001) and PS (R²=0.654 2, P<0.001) were suitable predictors to establish the equation of standardized ileal digestible Lys content when using univariate linear regression. 5) The coefficient of determination (R²) varied from 0.736 7 to 0.992 6 (P<0.001) for predictive equations of standardized ileal digestible content of Lys, arginine, isoleucine, leucine, threonine, valine, phenylalanine, histidine, aspartic acid, serine, glutamate, glycine, alanine, cysteine, tyrosine and proline based on conventional nutrient (dry matter, CP, ash, NDF, ether extract and acid detergent fiber) contents combined with PS and Lys:CP by multiple stepwise regression, which had high fitting degrees. These results indicate that using conventional nutrient content combined with heat processing sensitive index (PS and Lys:CP) can successfully predict the standardized ileal digestible amino acid content in rapeseed meal for meat ducks.

Key words： rapeseed meal; standardized ileal digestible amino acid content; predictive equation; meat ducks

Cite this article

ZHANG Kaixin , ZHANG Keying , DING Xuemei , BAI Shiping , WANG Jianping , PENG Huanwei , ZENG Qiufeng . Prediction Equations of Standardized Ileal Digestible Amino Acid Contents of Rapeseed Meal of Meat Ducks[J]. Chinese Journal of Animal Nutrition, 2020 , 32(6) : 2663 -2673 . DOI: 10.3969/j.issn.1006-267x.2020.06.025

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