Selective digesta retention and coprophagy in Brandt's vole (Microtus brandti)

Citation
Yx. Pei et al., Selective digesta retention and coprophagy in Brandt's vole (Microtus brandti), J COMP PH B, 171(6), 2001, pp. 457-464
Citations number
46
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences",Physiology
Journal title
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
ISSN journal
0174-1578 → ACNP
Volume
171
Issue
6
Year of publication
2001
Pages
457 - 464
Database
ISI
SICI code
0174-1578(200108)171:6<457:SDRACI>2.0.ZU;2-U
Abstract
Digestive performance, gut morphology and rate of digesta passage were meas ured in Brandt's votes (Microtus brandti) offered pelleted diets of low (25 % neutral-detergent fibre) and high (38%) fibre content. Digestion coeffici ents of dry matter, crude fat, crude protein, energy and fibre were all sig nificantly lower on the higher fibre diet. Although not significantly highe r, dry matter intakes were more than maintained when extra cellulose was in cluded in the diet, so that intakes of digestible energy were only 22% lowe r on the higher fibre diet. Total length and total gut tissue weight increa sed significantly, and the length and tissue weight of the caecum, proximal colon, and distal colon were significantly greater on the higher fibre die t as well. Total tract mean retention time (MRT) of a solute marker (Co-EDT A) was significantly greater than that of a particle marker (Cr-cell walls) on the lower fibre diet, and in the same direction on the higher fibre die t. The ratio of solute to particle MRTs (the solute/particle differential r etention ratio) was 1.45 on the lower fibre diet and 1.19 on the higher fib re diet. There were no significant differences in marker MRTs between diets . Examination of marker concentrations in the stomach small intestine, caec um and colon of votes killed at 0.5-h intervals after a pulse dose of Co-ED TA indicated that the marker was recycled to the stomach by coprophagy. Thu s, as in other microtine rodents, an increase in gut capacity, selective di gesta retention and recycling of digesta via coprophagy enables Brandt's vo tes to utilise diets of higher fibre content than may be expected for such a small (45 g) mammalian herbivore.