کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10976833 | 1108044 | 2012 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Use of algae or algal oil rich in n-3 fatty acids as a feed supplement for dairy cattle
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Fish oil is used as a ration additive to provide n-3 fatty acids to dairy cows. Fish do not synthesize n-3 fatty acids; they must consume microscopic algae or other algae-consuming fish. New technology allows for the production of algal biomass for use as a ration supplement for dairy cattle. Lipid encapsulation of the algal biomass protects n-3 fatty acids from biohydrogenation in the rumen and allows them to be available for absorption and utilization in the small intestine. Our objective was to examine the use of algal products as a source for n-3 fatty acids in milk. Four mid-lactation Holsteins were assigned to a 4 Ã 4 Latin square design. Their rations were supplemented with 1à or 0.5à rumen-protected (RP) algal biomass supplement, 1à RP algal oil supplement, or no supplement for 7 d. Supplements were lipid encapsulated (Balchem Corp., New Hampton, NY). The 1à supplements provided 29 g/d of docosahexaenoic acid (DHA), and 0.5à provided half of this amount. Treatments were analyzed by orthogonal contrasts. Supplementing dairy rations with rumen-protected algal products did not affect feed intake, milk yield, or milk component yield. Short- and medium-chain fatty acid yields in milk were not influenced by supplements. Both 0.5à and 1à RP algae supplements increased daily milk fat yield of DHA (0.5 and 0.6 ± 0.10 g/d, respectively) compared with 1à RP oil (0.3 ± 0.10 g/d), but all supplements resulted in milk fat yields greater than that of the control (0.1 ± 0.10 g/d). Yield of trans-18:1 fatty acids in milk fat was also increased by supplementation. Trans-11 18:1 yield (13, 20, 27, and 15 ± 3.0 g/d for control, 0.5à RP algae, 1à RP algae, and 1à RP oil, respectively) was greater for supplements than for control. Concentration of DHA in the plasma lipid fraction on d 7 showed that the DHA concentration was greatest in plasma phospholipid. Rumen-protected algal biomass provided better DHA yield than algal oil. Feeding lipid-encapsulated algae supplements may increase n-3 content in milk fat without adversely affecting milk fat yield; however, preferential esterification of DHA into plasma phospholipid may limit its incorporation into milk fat.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 95, Issue 9, September 2012, Pages 5269-5275
Journal: Journal of Dairy Science - Volume 95, Issue 9, September 2012, Pages 5269-5275
نویسندگان
J.A. Stamey, D.M. Shepherd, M.J. de Veth, B.A. Corl,