Time related alterations in digestibility and faecal characteristics as affected by dietary composition in the Nile tilapia (Oreochromis niloticus L.)

A.K. Amirkolaie, J.W. Schrama

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

After being shifted to a new diet, time related alterations in digestibility, faecal waste production and faeces recovery in Nile tilapia were assessed in relation with dietary ingredient composition. Four experimental diets were formulated according to a 2 by 2 factorial design: two starch inclusion levels (20 or 40%) and two maize starch types (native versus gelatinized). After introduction to the experimental diets, faeces were collected weekly from Week 2 till 6 using settling tanks. Digestibility of ash, organic matter and dry matter increased with time (P <0.001). For organic and dry matter the time related alteration in digestibility were different between both starch types (P <0.05). All faecal waste characteristics altered with time (P <0.01). The incline in faeces recovery with time was affected by starch type (P <0.01); being the largest at the 40% gelatinized maize diet. In conclusion, the minimal length of the adaptation period in digestibility studies for obtaining unbiased digestibility estimates is dependent on diet composition, in this study with Nile tilapia 4 weeks for diets with gelatinized starch and 6 weeks with native starch.
Original languageEnglish
Pages (from-to)1078-1086
JournalAquaculture Research
Volume46
Issue number5
DOIs
Publication statusPublished - 2015

Keywords

  • trout oncorhynchus-mykiss
  • chain fatty-acids
  • apparent digestibility
  • soybean-meal
  • feces collection
  • feed ingredients
  • inclusion level
  • gut microbes
  • guar gum
  • fish

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