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Titolo:
Ideal amino acid profiles as a basis for feed protein evaluation
Autore:
Boisen, S; Hvelplund, T; Weisbjerg, MR;
Indirizzi:
Danish Inst Agr Sci, Res Ctr Foulum, Dept Anim Nutr & Physiol, DK-8830 Tjele, Denmark Danish Inst Agr Sci Tjele Denmark DK-8830 hysiol, DK-8830 Tjele, Denmark
Titolo Testata:
LIVESTOCK PRODUCTION SCIENCE
fascicolo: 2-3, volume: 64, anno: 2000,
pagine: 239 - 251
SICI:
0301-6226(200006)64:2-3<239:IAAPAA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIETARY-PROTEIN; DAIRY-COWS; SMALL-INTESTINE; GROWING-PIGS; KG LIVEWEIGHT; DIGESTIBILITY; NITROGEN; PATTERN; LYSINE; DEGRADABILITY;
Keywords:
pig; dairy cow; amino acids; ideal protein; protein evaluation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Boisen, S Danish Inst Agr Sci, Res Ctr Foulum, Dept Anim Nutr & Physiol, POB 50, DK-8830 Tjele, Denmark Danish Inst Agr Sci POB 50 Tjele Denmark DK-8830 Tjele, Denmark
Citazione:
S. Boisen et al., "Ideal amino acid profiles as a basis for feed protein evaluation", LIVEST PROD, 64(2-3), 2000, pp. 239-251

Abstract

The most important single factor affecting the efficiency of protein utilization is the profile of digestible essential amino acids entering the, small intestine. Assuming a constant ideal amino acid profile of absorbed protein the requirements of all amino acids can be calculated when the requirement of one individual amino acid has been determined. In non-ruminants, thesupply will be greatly influenced by the diet, but less so in ruminants due to the rumen microbial degradation of feed protein and synthesis of microbial protein with high biological value. However, the high-producing dairy cow requires a significant amount of numen escape protein. Thus, the profile of the undegraded feed protein could influence the profile of the amino acids entering the small intestine to a point at which individual amino acids become limiting. For non-ruminants, lysine is usually the first limiting amino acid in feedstuffs. This has led to the general practice of expressing the requirements for all other essential amino acids relative to lysine. Alternatively, the amino acid requirements can be expressed relative to N. Then, dietary N required for synthesis of other N-compounds is also included. Moreover, the requirements of all amino acids can be calculated when theN requirement has been determined. However, this method cannot be used forruminants, because the N requirement of rumen microbes may be higher than the requirement of the animal. In the future, computerised animal models based on scientifically correct feed evaluation systems offer the opportunityfor securing optimal feeding of farm animals in relation to their ideal amino acid profile for all different purposes of production. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

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