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Titolo:
Effect of fish-oil supplementation on levels of (n-3) poly-unsaturated fatty acids in the lipoprotein fractions of bovine plasma
Autore:
Offer, NW; Speake, BK; Dixon, J; Marsden, M;
Indirizzi:
Scottish Agr Coll, Food Syst Div, Auchincruive KA6 5HW, Ayr, Scotland Scottish Agr Coll Auchincruive Ayr Scotland KA6 5HW A6 5HW, Ayr, Scotland ABN House, Peterborough PE2 9QF, England ABN House Peterborough England PE2 9QF se, Peterborough PE2 9QF, England
Titolo Testata:
ANIMAL SCIENCE
, volume: 73, anno: 2001,
parte:, 3
pagine: 523 - 531
SICI:
1357-7298(200112)73:<523:EOFSOL>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONJUGATED LINOLEIC-ACID; MILK-FAT; LACTATING COWS; MAMMARY-GLAND; DAIRY-COWS; RUMINANTS; DIETARY; TISSUE; LIPIDS; LIPASE;
Keywords:
lipoproteins; milk; plasma; polyenoic fatty acids;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Offer, NW Scottish Agr Coll, Food Syst Div, Auchincruive KA6 5HW, Ayr, Scotland Scottish Agr Coll Auchincruive Ayr Scotland KA6 5HW r, Scotland
Citazione:
N.W. Offer et al., "Effect of fish-oil supplementation on levels of (n-3) poly-unsaturated fatty acids in the lipoprotein fractions of bovine plasma", ANIM SCI, 73, 2001, pp. 523-531

Abstract

Eight mid-lactation Holstein-Friesian dairy cows were used in an experiment to investigate whether poor transfer to milk of (n-3) long chain (greaterthan or equal to C20) poly-unsaturated fatty acids (n-3 LCPUFA), from diets containing fish oil, is related to their mode of transport in plasma lipoproteins. The cows were split into two groups of four, each of which was housed with 24 other cows which did not provide blood data in this experiment. All cows received a basal diet ad libitum consisting of (kg/t dry matter)silage (539), grain dis tillers' grains (148), rolled barley (248) and soya (65). All cows also received a mid-day meal of 2.76 kg per cow per day ofmolassed sugar-beet shreds. The control group (C) received no oil supplement but those in the treatment group (F) received 300 g per cow per day of fish oil absorbed onto the sugar-beet shreds. Fish oil inclusion progressively depressed milkfat concentration of the four cows from each group over the 3 weeks of the experiment so that levels were approximately 20 g/kg lowerfor cows in treatment F than for those in C (P < 0.05). Mean concentrations over all cows of the long-chain (greater than or equal to C20, n-3) polyunsaturated fatty acids in milk fat (g/100 g) were 0.12 and 0.54 for treatments C and F respectively, whilst corresponding output in milk (g/day) increased from 1.16 to 3.91, an average efficiency of transfer of 4.6%. The fatty acid compositions of the lipoproteins were measured in plasma samples from the four cows from each group after 3 weeks on the experimental diets Theproportions (g/100 g fatty acids) of C20 : 5 (n-3) in cholesteryl (CE) andphospholipid (PL) of high-density lipoprotein (HDL) in the plasma were respectively increased from 0.97 to 4.39 (P < 0.05) and from 1.15 to 4.74 (P <0.01) by the fish-oil supplementation. For C22 : 6 (n-3), the proportions in CE and PL of HDL respectively increased (P < 0.001) from 0.02 to 0.23 and from 0.16 to 2.18 as a result of the supplementation. The mean proportions (g/100 g fatty acids) of C20: 5 (n-3) and C22 : 6 (n-3) in the triglyceride fraction of very low-density lipoprotein were 1.05 and 2.3 respectively and were not significantly altered by fish-oil supplementation (P > 0.05). It is suggested that the low transfer efficiency of (n-3) LCPUFA to the milk is partly due to their transport in the plasma largely as components of HDL lipids which are unavailable to the mammary gland.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 15:32:02