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Titolo:
THE EFFECT OF TEMPERATURE DURING PROCESSING OF RAPE SEED MEAL ON AMINO-ACID DEGRADATION IN THE RUMEN AND DIGESTION IN THE INTESTINE
Autore:
DAKOWSKI P; WEISBJERG MR; HVELPLUND T;
Indirizzi:
POLISH ACAD SCI,KIELANOWSKI INST ANIM PHYSIOL & NUTR PL-05110 JABLONNA POLAND POLISH ACAD SCI,KIELANOWSKI INST ANIM PHYSIOL & NUTR PL-05110 JABLONNA POLAND DANISH INST ANIM SCI,RES CTR FOULUM FOULUM DENMARK
Titolo Testata:
Animal feed science and technology
fascicolo: 3-4, volume: 58, anno: 1996,
pagine: 213 - 226
SICI:
0377-8401(1996)58:3-4<213:TEOTDP>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNDEGRADED DIETARY-PROTEIN; SOYBEAN-MEAL; CANOLA-MEAL; DRY-MATTER; DEGRADABILITY; RUMINANTS; HEAT; DIGESTIBILITY; NITROGEN; LYSINE;
Keywords:
CATTLE GENERAL; RAPESEED MEAL; DIGESTIBILITY AMINO ACIDS; PROTEINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
P. Dakowski et al., "THE EFFECT OF TEMPERATURE DURING PROCESSING OF RAPE SEED MEAL ON AMINO-ACID DEGRADATION IN THE RUMEN AND DIGESTION IN THE INTESTINE", Animal feed science and technology, 58(3-4), 1996, pp. 213-226

Abstract

Commercially processed rapeseed meals either untreated or treated at temperatures of 130, 140 and 150 degrees C and moisture levels of 15 and 20% were used to measure protein and amino acid degradation in the rumen and digestibility in the intestine. Effects of these treatments were measured with nylon bag and mobile bag techniques using rumen andduodenal fistulated cows. For untreated rapeseed meals effective protein degradabilities were similar and about 73%, but for heat treated meals the degradability decreased to 56% for moderate heat treatment and to 15-23% for 140 and 150 degrees C treatments. The 16 h rumen protein and amino acid degradabilities for untreated samples were similar; however, for heated samples, degradability of protein (averaged over moisture levels) was higher than for total amino acid nitrogen: 48.8 and 39.9%, 22.8 and 8.1%, and 20.1 and 4.5%, for samples heated to 130 degrees C, 140 degrees C and 150 degrees C, respectively. Higher degradabilities of protein, total amino acid nitrogen and individual amino acids were found using 20% compared with 15% moisture. Intestinal digestibility of protein from rapeseed meal samples preincubated during 16 h in the rumen was on average 81% for samples heated to 130 degrees C,73% for unheated samples and 67% for samples heated to 140 and 150 degrees C. A similar effect of heat iii treatment was found for intestinal digestibilities of total and individual amino acid nitrogen. Digestibility of intact protein in the intestine was similar for untreated meals and those heat-treated at 130 degrees C and averaged 89%, but forsamples heated to 140 and 150 degrees C the digestibility was only 65-70%. The proportion of the protein digested in the intestine was higher for rapeseed meals treated at 130 degrees C (38%) than for untreated meal (21%), and the total digestibility was unchanged, indicating that heat treatment at 130 degrees C did not overprotect the protein andmay shift the site of protein digestion from the rumen to the intestine.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:32:51