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Effects of addition of different sources and doses of sugars on in vitro digestibilities of dry matter, fibre and cell wall monosaccharides of corn silage in ruminants

Published online by Cambridge University Press:  11 March 2020

F. P. Campos Open the ORCID record for F. P. Campos [Opens in a new window] ,
L. G. Nussio ,
P. Sarmento ,
J. L. P. Daniel  and
C. G. Lima
F. P. Campos*
Affiliation:
Instituto de Zootecnia/Agência Paulista de Tecnologia do Agronegócio/ Secretaria da Agricultura e Abastecimento, Rua Heitor Penteado, 56, Nova Odessa, SP13380.011, Brazil
L. G. Nussio
Affiliation:
Departamento de Zootecnia, Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Avenida Pádua Dias, 11, Piracicaba, SP13418.900, Brazil
P. Sarmento
Affiliation:
Instituto de Zootecnia/Agência Paulista de Tecnologia do Agronegócio/ Secretaria da Agricultura e Abastecimento, Rua Heitor Penteado, 56, Nova Odessa, SP13380.011, Brazil
J. L. P. Daniel
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo 5790, Bloco J45, Zona 7, Maringá, PR87020.900, Brazil
C. G. Lima
Affiliation:
Departamento de Ciências Básicas, Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Avenida Duque de Caxias 225, Jardim Elite, Pirassununga, SP13635.900, Brazil
*
†E-mail: [email protected] or [email protected]
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Abstract

In ruminant diets, soluble sugar is an important factor in the digestive process. The objective of this study was to evaluate the effects of the source and dose of soluble sugars, under controlled pH conditions, on the in vitro digestibility of DM, fibre fractions (NDF and ADF) and cell wall neutral monosaccharides of corn silage. Silage was collected from several points in a silage mass from a bunker silo, oven-dried at 55°C and ground through a 1-mm screen. Sub-samples were combined with sugars to compose the treatments, in a 5 × 5 factorial arrangement, as a combination of five soluble sugar sources (glucose, fructose, arabinose, xylose and sucrose) and five sugar doses (0, 100, 200, 300 and 400 g/kg sugar in DM corn silage), respecting the following proportions of sugar : corn silage, 0 : 100, 10 : 90, 20 : 80, 30 : 70, 40 : 60 represented by the sugar doses, respectively. An in vitro test was performed to determine the true digestibility (D) of the chemical entities (DM, NDF and ADF) and cell wall monosaccharides (glucose = gluc, arabinose = arab and xylose = xyl). During the first 12 h of incubation, the pH was maintained above 6.0 by the addition of 2.5 N NaOH. The concentrations of neutral monosaccharides (arabinose, xylose and glucose) were determined by GLC. The soluble sugars decreased the digestibility of corn silage followed by pH reduction, especially at doses higher than 200 g/kg sugar. Overall, xylose, followed by sucrose, fructose and arabinose, had greater impacts on DM digestibility, whereas fibre digestibility was impaired by sucrose at all doses. Xylose and fructose had greater impacts on NDF digestibility at 300 and 400 g/kg sugar. Although xylose impaired the Dgluc in the cell wall in all doses. All doses of glucose improved the Dgluc and Dxyl in the cell wall.

Keywords

arabinosefructoseglucosesucrosexylose
Type
Research Article
Information
animal , Volume 14 , Issue 8 , August 2020 , pp. 1667 - 1675
Copyright
© The Animal Consortium 2020

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