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The nutritive value of stackburned yellow maize for livestock: tests in vitro and in broiler chicks

Published online by Cambridge University Press:  09 March 2007

S. Panigrahi ,
L.A. Bestwick ,
R.H. Davis  and
C. D. Wood
S. Panigrahi
Affiliation:
Natural Resources Institute, Central Avenue, Chatham Maritime ME4 4TB
L.A. Bestwick
Affiliation:
Wye College, University of London, Wye, Ashford TN25 5AH
R.H. Davis
Affiliation:
Wye College, University of London, Wye, Ashford TN25 5AH
C. D. Wood
Affiliation:
Natural Resources Institute, Central Avenue, Chatham Maritime ME4 4TB
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Abstract

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Differences in the nutritive value of four grades of stackburned yellow maize, obtained from a single storage unit in Mozambique, were examined. Samples were analysed for chemical composition, and subjected to the following in vitro assays for estimating digestibility: total dietary fibre and pancreatin for non-ruminants, and gas production using sheep rumen fluid for ruminant livestock. Samples were also fed to broiler chicks at 600 g/kg diet in a growth trial. There were no significant differences in crude protein contents of the maize samples, but there was evidence for the development of Maillard reaction products. Detectable amino acids were lower in discoloured maize, with decreases of 52% in lysine, 35% in arginine, and 15% in glycine concentration in the most severely discoloured sample compared with control. Total starch, reducing sugar, acid-detergent fibre a d amylase-neutral-detergent fibre values increased, while total non-reducing sugar content decreased with increased discolouration. Total dietary fibre and pancreatin assays indicated a lowering in digestibility of maize with increasing discolouration. Weight gain of chicks (P=0·0228), efficiency of feed utilization (P=0·0009) and the metabolizable energy value of diets decreased (P<0·0001) with increasing stackburn discolouration. There were no significant effects on N retention of diets. In vitro fermentation using sheep rumen fluid showed a linear decrease in gas production with increasing maize discolouration, indicating a reduction in rumen degradability with stackburn

Keywords

Nutrition valueMaizeLivestock feed
Type
Animal Nutrition
Information
British Journal of Nutrition , Volume 76 , Issue 1 , July 1996 , pp. 97 - 108
Copyright
Copyright © The Nutrition Society 1996

References

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