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Titolo:
Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid
Autore:
Scollan, ND; Dhanoa, MS; Choi, NJ; Maeng, WJ; Enser, M; Wood, JD;
Indirizzi:
Inst Grassland & Environm Res, Aberystwyth SY23 3EB, Dyfed, Wales Inst Grassland & Environm Res Aberystwyth Dyfed Wales SY23 3EB fed, Wales Kon Kuk Univ, ARRC, Dept Feed & Nutrit Sci, Seoul 143701, South Korea Kon Kuk Univ Seoul South Korea 143701 rit Sci, Seoul 143701, South Korea Univ Bristol, Div Food Anim Sci, Bristol BS18 7DY, Avon, England Univ Bristol Bristol Avon England BS18 7DY ristol BS18 7DY, Avon, England
Titolo Testata:
JOURNAL OF AGRICULTURAL SCIENCE
, volume: 136, anno: 2001,
parte:, 3
pagine: 345 - 355
SICI:
0021-8596(200105)136:<345:BADOLC>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
DAIRY-COWS; IN-VITRO; ORGANIC-MATTER; PLASMA-LIPIDS; LINOLEIC-ACID; CANOLA SEED; SOYBEAN OIL; RUMEN; METABOLISM; RAPESEED;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Scollan, ND Inst Grassland & Environm Res, Pl Gogerddan, Aberystwyth SY23 3EB, Dyfed, Wales Inst Grassland & Environm Res Pl Gogerddan Aberystwyth Dyfed Wales SY23 3EB
Citazione:
N.D. Scollan et al., "Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid", J AGR SCI, 136, 2001, pp. 345-355

Abstract

Rumen biohydrogenation of dietary polyunsaturated fatty acids (PUFA) is a significant limitation on any attempt to manipulate the PUFA content of ruminant products (meat or milk). This study examined rumen biohydrogenation of PUFA, the effects of PUFA on other aspects of rumen metabolism and fatty acid flow to and digestion in the small intestine of steers fed on different sources of lipid. Animals were fed ad libitum on grass silage and one of four concentrates (60:40 forage:concentrate on a dry matter basis) containing differing sources of lipid: megalac (rich in C16:0; M), linseed (rich inC18:3n-3; L), fish oil (rich in C20:5n-3 and C22:6n-3; FO) and a mixture of linseed/fish oil (LFO). Diets were formulated so that total dietary oil intake was approximately 60 g/kg of the DM intake, approximately half of which was from the experimental test oil. Rumen NH3-N (P = 0.09) and total VFAconcentrations (P = 0.007) were higher on L. FO and LFO compared to M. Drymatter intakes did not differ across treatments and averaged 7.2 kg/day. Intake and flow of fatty acids to the duodenum was 323, 438, 344 and 381 (S.E.M. 9 1; P < 0.001) and 432, 489, 412 and 465 (S.E.M. 18.5; P < 0.1)g/day for M, L, FO and LFO, respectively. Biohydrogenation of C18: 1n-9 was lowerthan all the other unsaturated fatty acids and it was lower of FO and LFO compared to M and L, on average 66.1 and 72.2%, respectively. Biohydrogenation of C18:2n-6 averaged 89.8% across treatments and was lower (P < 0.05) on M compared to L and FO. Biohydrogenation of C18:3n-3 averaged 92.1% across treatments and was lowest on M (88.8 %) and highest on L and LFO (94.3%). Biohydrogenation of C20:5n-3 and C22:6n-3 averaged approximately 91 and 89% across the treatments, respectively. Small intestinal digestibilities ofall fatty acids were high. In conclusion, feeding different sources of lipid with different fatty acid composition had significant effects on rumen function. The PUFA in whole linseed were only partially protected from biohydrogenation by the seed coat and in contrast to previous reports the C,, PUFA in fish oil were biohydrogenated to a large extent.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:07:15