Apparent and standardised ileal amino acid digestibility of wheat distillers dried grains with solubles with or without exogenous protease in broilers and turkeysby Adekunle Olalekan Adebiyi, Oluyinka Abiona Olukosi

British Poultry Science

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Year
2015
DOI
10.1080/00071668.2015.1011606
Subject
Animal Science and Zoology / Food Science

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Apparent and standardised ileal amino acid digestibility of wheat distillers dried grains with solubles with or without exogenous protease in broilers and turkeys

A. O. Adebiyia & O. A. Olukosia a Avian Science Research Centre, Scotland’s Rural College, Ayr, KA6 5HW, United Kingdom

Accepted author version posted online: 30 Jan 2015.

To cite this article: A. O. Adebiyi & O. A. Olukosi (2015): Apparent and standardised ileal amino acid digestibility of wheat distillers dried grains with solubles with or without exogenous protease in broilers and turkeys, British Poultry Science, DOI: 10.1080/00071668.2015.1011606

To link to this article: http://dx.doi.org/10.1080/00071668.2015.1011606

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Publisher: Taylor & Francis & British Poultry Science Ltd

Journal: British Poultry Science

DOI: 10.1080/00071668.2015.1011606

Apparent and standardised ileal amino acid digestibility of wheat distillers dried grains with solubles with or without exogenous protease in broilers and turkeys

A. O. ADEBIYI AND O. A. OLUKOSI

Avian Science Research Centre, Scotland’s Rural College, Ayr, KA6 5HW, United

Kingdom

Correspondence to: Oluyinka Abiona Olukosi, Avian Science Research Centre,

Scotland’s Rural College, Auchincruive, Ayr, KA6 5HW, United Kingdom.

Email: oluyinka.olukosi@sruc.ac.uk

Tel: +44 1292-525103.

Fax: +44 1292-525098.

CBPS-2014-342

Ed. Kjaer, December 2014; MacLeod January 2015

Running title: Amino acid digestibility in wheat DDGS

Accepted for publication 24th November 2014

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Abstract. 1. The apparent- (AIAAD) and standardised ileal amino acid digestibility (SIAAD) of wheat distillers dried grains with solubles (wheat-DDGS) was determined for broilers and turkeys at 28 d using two experiments. 2. A total of 84 male Ross 308 broiler chicks (Experiment 1) or 84 male BUT 10 turkey poults (Experiment 2) were offered a nutrient-adequate diet from d 1 to 23. On d 23, birds in each experiment were allocated to 4 treatments consisting of a nitrogen-free diet (with- or without protease) and an assay diet containing wheat-DDGS as the only source of amino acids (with- or without protease) in a randomised complete block design. 3. In experiments 1 and 2, the coefficient of AIAAD or SIAAD of Lys and Asp were low irrespective of protease. In experiment 1, the coefficient of AIAAD ranged from 0.35 (Ala) to 0.75 (Pro) without protease whereas the range was 0.42 (Thr) to 0.82 (Pro) with protease. Protease improved the coefficient of AIAAD for Arg and Pro and tended to improve the coefficient of AIAAD for Met. Without protease, the coefficient of

SIAAD ranged from 0.51 (Ala) to 0.84 (Pro) whereas the range was from 0.65 (Ala) to 0.93 (Pro) with protease. Protease improved the coefficient of SIAAD of Arg, Leu, Phe,

Met, Val and Pro. 4. In experiment 2, the coefficient of AIAAD was lower than 0.50 for all amino acids except for Glu (0.70) and Pro (0.81) without protease. On the other hand, the coefficient of SIAAD ranged from 0.41 (Thr) to 0.89 (Pro) without protease whereas the range was from 0.56 (Arg) to 0.88 (Pro) with protease supplementation. With the exception of Cys and Pro, protease improved the coefficient of AIAAD and SIAAD of all other amino acids by 0.05 to 0.19.

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Ac ce pte d M an us cri pt 5. It was concluded that the AIAAD and SIAAD of wheat-DDGS are variable and are generally greater in broilers compared to turkeys at 28 d of age. Protease improved the ileal digestibility of a large number of amino acids in wheat-DDGS for broilers and turkeys.

INTRODUCTION

Wheat distillers dried grains with solubles (wheat-DDGS) is the main co-product of bioethanol produced from wheat grain by the dry-grind process. The removal of the starch in wheat during bioethanol production concentrates other nutrients in wheatDDGS (Liu, 2011). Therefore, wheat-DDGS contains greater quantities of crude protein (CP) and amino acids (AA) compared to wheat grain. Maize-DDGS is a good source of