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Freeze‑dried Nannochloropsis oceanica biomass protects eicosapentaenoic acid (EPA) from metabolization in the rumen of lambs
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Freeze‑dried Nannochloropsis oceanica biomass protects eicosapentaenoic acid (EPA) from metabolization in the rumen of lambs
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Journal Article
Freeze‑dried Nannochloropsis oceanica biomass protects eicosapentaenoic acid (EPA) from metabolization in the rumen of lambs
2021
Overview
Eicosapentaenoic acid (EPA) from freeze-dried biomass of
Nannochloropsis oceanica
microalgae resists ruminal biohydrogenation in vitro, but in vivo demonstration is needed. Therefore, the present study was designed to test the rumen protective effects of
N. oceanica
in lambs. Twenty-eight lambs were assigned to one of four diets: Control (C); and C diets supplemented with: 1.2%
Nannochloropsis
sp. oil (O); 12.3% spray-dried
N. oceanica
(SD); or 9.2%
N. oceanica
(FD), to achieve 3 g EPA /kg dry matter. Lambs were slaughtered after 3 weeks and digestive contents and ruminal wall samples were collected. EPA concentration in the rumen of lambs fed FD was about 50% higher than lambs fed SD or O diets. Nevertheless, the high levels of EPA in cecum and faeces of animals fed
N. oceanica
biomass, independently of the drying method, suggests that EPA was not completely released and absorbed in the small intestine. Furthermore, supplementation with EPA sources also affected the ruminal biohydrogenation of C18 fatty acids, mitigating the shift from the
t
10 biohydrogenation pathways to the
t
11 pathways compared to the Control diet. Overall, our results demonstrate that FD
N. oceanica
biomass is a natural rumen-protected source of EPA to ruminants.
Publisher
NATURE RESEARC, GERMANY,Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
