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Hot topic: Enhancing omega-3 fatty acids in milk fat of dairy cows by using stearidonic acid-enriched soybean oil from genetically modified soybeans

Bernal-Santos, G. ; O’Donnell, A.M. ; Vicini, J.L. ; Hartnell, G.F. ; Bauman, D.E.

Journal of dairy science, 2010-01, Vol.93 (1), p.32-37 [Periódico revisado por pares]

New York, NY: Elsevier Inc

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Hot topic: Enhancing omega-3 fatty acids in milk fat of dairy cows by using stearidonic acid-enriched soybean oil from genetically modified soybeans
Autor: Bernal-Santos, G. ; O’Donnell, A.M. ; Vicini, J.L. ; Hartnell, G.F. ; Bauman, D.E.
Assuntos: abomasum ; Animal productions ; Animals ; biohydrogenation ; Biological and medical sciences ; Cattle ; cow feeding ; dairy cows ; Dairying - methods ; dry matter intake ; eicosapentaenoic acid ; Fats - chemistry ; Fatty Acids, Omega-3 - analysis ; Fatty Acids, Omega-3 - metabolism ; Female ; Food industries ; Fundamental and applied biological sciences. Psychology ; genetically modified foods ; Glycine max ; human health ; intestinal absorption ; lactose ; linolenic acid ; long chain fatty acids ; Milk - chemistry ; Milk and cheese industries. Ice creams ; milk composition ; milk fat ; milk fat percentage ; milk fat yield ; milk protein percentage ; milk protein yield ; milk yield ; omega-3 fatty acid ; omega-3 fatty acids ; Plants, Genetically Modified - chemistry ; Pregnancy ; Random Allocation ; rumen ; rumen fermentation ; soybean oil ; Soybean Oil - administration & dosage ; stearidonic acid ; Terrestrial animal productions ; transgenic plants ; uptake mechanisms ; Vertebrates
É parte de: Journal of dairy science, 2010-01, Vol.93 (1), p.32-37
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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Descrição: Very long chain n-3 fatty acids such as eicosapentaenoic acid (EPA; 20:5n-3) are important in human cardiac health and the prevention of chronic diseases, but food sources are limited. Stearidonic acid (SDA; 18:4n-3) is an n-3 fatty acid that humans are able to convert to EPA. In utilizing SDA-enhanced soybean oil (SBO) derived from genetically modified soybeans, our objectives were to examine the potential to increase the n-3 fatty acid content of milk fat and to determine the efficiency of SDA uptake from the digestive tract and transfer to milk fat. Three multiparous, rumen-fistulated Holstein cows were assigned randomly in a 3 × 3 Latin square design to the following treatments: 1) control (no oil infusion); 2) abomasal infusion of SDA-enhanced SBO (SDA-abo); and 3) ruminal infusion of SDA-enhanced SBO (SDA-rum). The SDA-enhanced SBO contained 27.1% SDA, 10.4% α-linolenic acid, and 7.2% γ-linolenic acid. Oil infusions provided 57 g/d of SDA with equal amounts of oil infused into either the rumen or abomasum at 6-h intervals over a 7-d infusion period. Cow numbers were limited and no treatment differences were detected for DMI or milk production (22.9±0.5 kg/d and 32.3±0.9 kg/d, respectively; least squares means ± SE), milk protein percentage and yield (3.24±0.04% and 1.03±0.02 kg/d), or lactose percentage and yield (4.88±0.05% and 1.55±0.05 kg/d). Treatment also had no effect on milk fat yield (1.36±0.03 kg/d), but milk fat percentage was lower for the SDA-rum treatment (4.04±0.04% vs. 4.30±0.04% for control and 4.41±0.05% for SDA-abo). The SDA-abo treatment increased n-3 fatty acids to 3.9% of total milk fatty acids, a value more than 5-fold greater than that for the control. Expressed as a percentage of total milk fatty acids, values (least squares means ± SE) for the SDA-abo treatment were 1.55±0.03% for α-linolenic acid (18:3n-3), 1.86±0.02 for SDA, 0.23 ± <0.01 for eicosatetraenoic acid (20:4n-3), and 0.18±0.01 for EPA. Transfer efficiency of SDA to milk fat represented 39.3% (range=36.8 to 41.9%) of the abomasally infused SDA and 47.3% (range=45.0 to 49.6%) when the n-3 fatty acids downstream from SDA were included. In contrast, transfer of ruminally infused SDA to milk fat averaged only 1.7% (range=1.3 to 2.1%), indicating extensive rumen biohydrogenation. Overall, results demonstrate the potential to use SDA-enhanced SBO from genetically modified soybeans combined with proper ruminal protection to achieve impressive increases in the milk fat content of SDA and other n-3 fatty acids that are beneficial for human health.
Editor: New York, NY: Elsevier Inc
Idioma: Inglês

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Hot topic: Enhancing omega-3 fatty acids in milk fat of dairy cows by using stearidonic acid-enriched soybean oil from genetically modified soybeans

Bernal-Santos, G. ; O’Donnell, A.M. ; Vicini, J.L. ; Hartnell, G.F. ; Bauman, D.E.

New York, NY: Elsevier Inc

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