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Titolo:
APPROPRIATE METHODS FOR THE EVALUATION OF TROPICAL FEEDS FOR RUMINANTS
Autore:
MADSEN JH; HVELPLUND T; WEISBJERG MR;
Indirizzi:
ROYAL VET & AGR UNIV,DEPT ANIM SCI & ANIM HLTH,ROLIGHEDSVEJ 23 DK-1958 FREDERIKSBERG C DENMARK DANISH INST ANIM SCI,DEPT NUTR,RES CTR FOULUM DK-8830 TJELE DENMARK
Titolo Testata:
Animal feed science and technology
fascicolo: 1-3, volume: 69, anno: 1997,
pagine: 53 - 66
SICI:
0377-8401(1997)69:1-3<53:AMFTEO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNDEGRADED DIETARY-PROTEIN; MOBILE BAG TECHNIQUE; DEGRADATION CHARACTERISTICS; INSACCO DEGRADATION; VOLUNTARY INTAKE; RUMEN; DEGRADABILITY; DIGESTIBILITY; PREDICTION; INCUBATION;
Keywords:
INTAKE; ENERGY VALUE; PROTEIN VALUE; NYLON BAG; IN VITRO; ENZYMES;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
J.H. Madsen et al., "APPROPRIATE METHODS FOR THE EVALUATION OF TROPICAL FEEDS FOR RUMINANTS", Animal feed science and technology, 69(1-3), 1997, pp. 53-66

Abstract

The nutritive value of a feedstuff is dependent on the intake and on the amount of nutrients absorbed from the ingested feedstuff during its passage through the gastro intestinal tract. This paper, however, focuses only on the potentials and limitations of some methods found appropriate to estimate the feed intake, energy value and the protein value of feedstuffs. It was concluded that experiments should be made to establish the potential feed intake of different tropical feeds. A system based on the physical fill of feed in the rumen is appropriate as the dominant limitation for intake in ruminants is physical fill of partly digested plant fibers in the rumen. The degradation and passage rates of NDF in the rumen is a potentially useful method to predict thephysical fill of fibrous feeds. The potential digestibility of a widevariety of feeds can be determined with reasonable accuracy by using rumen fluid in vitro. The energetic value of concentrate feeds can moreover be determined by enzymatic methods which do not require rumen fluid. For very poor roughage, in vitro methods are less reproducible and should be supplemented with the nylon bag method. The traditional chemical analyses, e.g. for crude fibre, NDF or ADF do not predict the digestibility well, except for feeds where the relationship between thechemical analysis and the digestibility has been established beforehand. The protein value of a feed depends on rumen degradation as well as the amino acid content and digestibility of the undegraded protein passing to the small intestine. The nylon bag method is the only available tool to generally predict the rumen degradation but the between laboratory variation is too big and figures obtained can only be used within laboratory. To improve reproducibility and reduce costs an alternative method is required, e.g. an enzymatic method. The intestinal digestibility of undegraded protein can only be predicted with the mobilebag technique and also here there is a need for alternative methods. Too little research is concerned with quantitative and qualitative protein need of the rumen microbes. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 09:24:33