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Titolo:
Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification
Autore:
Clauss, M; Lechner-Doll, M;
Indirizzi:
Univ Munich, Inst Anim Physiol Physiol Chem & Anim Nutr, D-80539 Munich, Germany Univ Munich Munich Germany D-80539 & Anim Nutr, D-80539 Munich, Germany Inst Zoo Biol & Wildlife Res, Berlin, Germany Inst Zoo Biol & Wildlife Res Berlin Germany ldlife Res, Berlin, Germany
Titolo Testata:
OECOLOGIA
fascicolo: 3, volume: 129, anno: 2001,
pagine: 321 - 327
SICI:
0029-8549(200111)129:3<321:DISRPR>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEER CAPREOLUS-CAPREOLUS; RUMEN CILIATE PROTOZOA; WAPITI CERVUS-ELAPHUS; ROE DEER; NUTRITIONAL ECOLOGY; RED DEER; AFRICAN RUMINANTS; BLUE DUIKER; VITAMIN-E; DIGESTION;
Keywords:
Browser-grazer dichotomy; forestomach physiology; selectivity factor; passage rate; rumen bypass;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
88
Recensione:
Indirizzi per estratti:
Indirizzo: Clauss, M Univ Munich, Inst Anim Physiol Physiol Chem & Anim Nutr, Vet Str13, D-80539 Munich, Germany Univ Munich Vet Str 13 Munich Germany D-805399 Munich, Germany
Citazione:
M. Clauss e M. Lechner-Doll, "Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification", OECOLOGIA, 129(3), 2001, pp. 321-327

Abstract

The measurement of passage rate is important for the concept of ruminant diversification. While supporters of Hofmann's 1989 feeding type classification claim that browsing ruminants have faster passage rates than grazing ruminants, other researchers consider the passage rate to depend on body sizealone. To date, no convincing comparison of ruminant passage rates has been put forward. For comparative purposes, we suggest the use of the "selectivity factor", which is an expression of how much longer particles of a defined size (<2 mm) are retained in the ruminant digestive tract than fluids. From the limited data available, it seems that grazing ruminants display selectivity factors between 1.56 and 3.80, whereas browsers have a much narrower range of 1.14-1.80. This suggests that browsers are not able to selectively retain particles as long as grazers. Intake of browsers, on the other hand, may not be limited by physical fill of the forestomach to the same degree as in grazers. This result can explain several observations on the digestive physiology of browsers, some of which have been linked to a rumen bypass mechanism. We propose that the ability for selective particle retention is a key factor for understanding the physiological consequences of ruminant diversification.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:54:06