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Title: Intestinal function and body growth of broiler chickens on maize-based diets supplemented with mimosa tannins and a microbial enzyme
Contributor(s): Iji, Paul  (author); Khumalo, Kwazi (author); Slippers, Stephen (author); Gous, Robert M (author)
Publication Date: 2004
DOI: 10.1002/jsfa.1816
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Abstract: A study was conducted to evaluate the effects of tannin (0, 5, 15, 20 and 25g kg⁻¹ diet) and a microbial enzyme supplement (MES) on the feed consumption, body growth and digestive physiology of broiler chickens between hatch and 22 days of age. Feed intake, body weight and body weight gain declined (p<0.001) with an increase in dietary tannin content. Feed conversion efficiency was increased (p<0.001) in line with dietary tannin level, up to 15g⁻¹ diet. There were no significant effects of dietary treatment on the protein content of pancreatic tissue or activities of pancreatic and jejunal enzymes. The ileal digestibilities of energy, protein, arginine, alanine and leucine were reduced (p<0.001) as dietary tannin level rose to 20g kg⁻¹ diet and beyond. The digestibilities of methionine and phenylalanine were also negatively affected (p<0.01) at the highest level of dietary tannins, while phosphorus digestion was improved (p<0.05) on diets containing tannin. Apart from an increase (p<0.01) in the protein content of the jejunal mucosa of birds on the diet with 20g tannin kg⁻¹ diet, there were no significant effects of the MES on most of the variables assessed. The results demonstrate the negative effects of tannin, especially at high levels of inclusion in the diet. However, neither tannins nor MES influenced the activities of digestive enzymes assessed, suggesting that a wider range of factors may be involved in regulating the effects of tannins on poultry.
Publication Type: Journal Article
Source of Publication: Journal of the Science of Food and Agriculture, 84(12), p. 1451-1458
Publisher: Wiley-Blackwell Publishing
Place of Publication: Bognor Regis, UK
ISSN: 0022-5142
Field of Research (FOR): 070502 Forestry Biomass and Bioproducts
070204 Animal Nutrition
070202 Animal Growth and Development
Socio-Economic Objective (SEO): 820401 Maize
830309 Poultry
860303 Plant Extracts (e.g. Pyrethrum, Alkaloids, Jojoba Oil)
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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