THE INFLUENCE OF THE PERIOD OF ADAPTATION ON THE DIGESTIBILITY OF DIETS CONTAINING DIFFERENT TYPES OF INDIGESTIBLE POLYSACCHARIDES IN RATS

Citation
G. Brunsgaard et al., THE INFLUENCE OF THE PERIOD OF ADAPTATION ON THE DIGESTIBILITY OF DIETS CONTAINING DIFFERENT TYPES OF INDIGESTIBLE POLYSACCHARIDES IN RATS, British Journal of Nutrition, 74(6), 1995, pp. 833-848
Citations number
37
Categorie Soggetti
Nutrition & Dietetics
ISSN journal
00071145
Volume
74
Issue
6
Year of publication
1995
Pages
833 - 848
Database
ISI
SICI code
0007-1145(1995)74:6<833:TIOTPO>2.0.ZU;2-#
Abstract
In balanced experiments with rats the influence of the period of adapt ation on nutrient digestibility in diets containing cellulose (GEL), g uar gum (GG), pectin (PEG) or retrograded high amylose maize starch (R S) was studied, Inclusion level was 80 g/kg diet DM except for the ret rograded high-amylose maize starch, where the level was 316 g/kg diet DM, A diet containing normal maize starch only acted as a control diet (FF), The apparent digestibilities of DM, NSP, starch and protein wer e determined after adaptation periods of 4 d and 2, 4, 6 and 8 weeks, The digestibility of nutrients was affected by diet (P < 0.001) as wel l as by the period of adaptation (P < 0.001), The digestibilities of D M, NSP and starch increased asymptotically during the course of the ex periment. The asymptotic progress over time was most pronounced for th e GG, PEC and RS diets, The estimated periods of adaptation required f or stable DM digestibility were approximately 1 week for the GG, PEC a nd RS diets and < 4 d for the FF and CEL diets, The digestibility of N SP in the GG and PEC diets was also stable after approximately 1 week, while it was stable from < 4 d for the CEL diet, However, PEC increas ed the faecal content of uronic acids for at least 2 weeks, A stable s tarch digestibility required 1 month in the case of RS and 3-10 d for the other diets. The high faecal content of glucose for the RS diet de creased during all 8 weeks but was still high at the close of the expe riment, The apparent protein digestibility changed over time in a para bolic rather than an asymptotic fashion, The GG, PEC and RS diets incr eased the amount of N excreted by the faecal route.