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Impact of fibre intake and fibre source on digestibility, gut development, retention time and growth performance of indigenous and exotic pigs

Published online by Cambridge University Press:  28 November 2012

T. T. B. Ngoc
Affiliation:
Department of Animal Nutrition and Forage, National Institute of Animal Sciences, Hanoi, Vietnam Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, PO Box 7024, 75007 Uppsala, Sweden
N. T. Len
Affiliation:
Department of Livestock Production, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
J. E. Lindberg*
Affiliation:
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, PO Box 7024, 75007 Uppsala, Sweden
*
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Abstract

The impact of fibre level and fibre source on digestibility, gastrointestinal tract (GIT) development, total tract mean retention time (MRT) and growth performance was studied in indigenous Mong Cai (MC) and exotic Landrace × Yorkshire (LY) pigs. The diets were based on maize, rice bran, soyabean meal, fish meal and soyabean oil, and cassava residue (CR) or brewer's grain (BG) as fibrous ingredient sources in the high-fibre diets (HF) and were fed ad libitum. A low-fibre diet (LF), containing around 200 g NDF/kg dry matter (DM), was formulated without CR and BG as feed ingredients. The HF diets (HF-CR and HF-BG) were formulated to contain around 270 g NDF/kg DM. The experiment was arranged as a 2 × 3 factorial completely randomized design with six replications, and lasted 27 days. Increased dietary fibre level resulted in a reduction (P < 0.05) in average daily gain, digestibility of organic matter (OM), CP and gross energy (GE) at the ileum and in the total tract, and in MRT, and an increase (P < 0.05) in the feed conversion ratio and in the weight of the GIT (except for small intestine and caecum). The coefficients of total tract digestibility of fibre fractions were higher in HF diets than in the LF diet, with highest values for diet HF-CR, which had a high proportion of soluble non-starch polysaccharides. MC pigs had longer MRT of digesta than LY pigs (P < 0.05), resulting in higher digestibility at the ileum and in the total tract. Across diets and breeds, the total tract apparent digestibility of OM, CP and GE was positively related (R2 = 0.80 to 0.84) to the MRT of solids, whereas the MRT was negatively related to the DM intake (R2 = 0.60).

Type
Nutrition
Copyright
Copyright © The Animal Consortium 2012

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