Supplementing grazing dairy ewes with plant-derived oil and rumen-protected EPA+DHA pellets enhances health-beneficial n-3 long-chain polyunsaturated fatty acids in sheep milk

Nguyen, Quang V., Le, Van H., Nguyen, Don V., Malau-Aduli, Bunmi S., Nichols, Peter D., and Malau-Aduli, Aduli E.O. (2018) Supplementing grazing dairy ewes with plant-derived oil and rumen-protected EPA+DHA pellets enhances health-beneficial n-3 long-chain polyunsaturated fatty acids in sheep milk. European Journal of Lipid Science and Technology, 120 (6).

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Abstract

This study investigates the impact of supplementing dairy ewes in mid lactation with rumen‐protected (RPO) pellets containing eicosapentaenoic acid (EPA, 20:5n−3) and docosahexaenoic acid (DHA, 22:6n−3) or pellets infused with 50 mL kg−1 DM of either canola (CO), rice bran (RBO), flaxseed (FSO), or safflower (SFO) oils on enhancing the concentration of n−3 long‐chain (≥C20) polyunsaturated fatty acids (n−3 LC‐PUFA) in milk. It is hypothesized that including these oils in the diet of grazing dairy ewes will improve milk fatty acid (FA) composition by increasing levels of n−3 LC‐PUFA. Sixty grazing dairy ewes balanced by sire breed and parity are randomly allocated to one of 6 treatments: 1) Control: commercial pellets without oil inclusion; 2) pellets containing 50 mL kg−1 DM of CO; 3) RBO; 4) FSO; 5) SFO; and 6) RPO at the rate of 1 kg day−1 for each ewe for 8 weeks. Weekly bulked daily milk FA analysis shows RPO has the most efficiency at elevating n−3 LC‐PUFA content by twofold, threefold, and fivefold greater concentrations of EPA, DPA, and DHA, respectively, than the control (0.17 vs 0.08%, 0.23 vs 0.08%, 0.19 vs 0.04%) (P < 0.0001). FSO improves levels of EPA (0.11%) and DPA (0.15%), while CO increases DPA (0.13%) (P < 0.0001). FSO and RPO reached the “source” and good “source” of n−3 LC‐PUFA (ΣEPA + DHA + DPA) contents of 35.1 and 61.7 mg 250 mL−1, respectively. These findings recommend that rumen protected pellets containing EPA + DHA, flaxseed, and potentially canola oil supplements, can be used to improve the content of n−3 LC‐PUFA in dairy ewe milk.

Item ID: 53168
Item Type: Article (Refereed Research - C1)
Keywords: sheep milk; supplements; n‐3 LC PUFA; oil; rumen‐protected
ISSN: 1438-9312
Funders: Department of Foreign Affairs and Trade (DFAT)
Projects and Grants: DFAT Australian Awards PhD Scholarship
Date Deposited: 25 Jun 2018 00:29
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830302 Dairy Cattle @ 50%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830310 Sheep - Meat @ 50%
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