Effect of dietary fish oil supplements alone or in combination with sunflower and linseed oil on ruminal lipid metabolism and bacterial populations in lactating cows
| Autor: | Vesa Toivonen, Kevin J. Shingfield, Pekka Huhtanen, Piia Kairenius, Seppo Ahvenjärvi, Robert Wallace, Aila Vanhatalo, S. Muetzel, Heidi Leskinen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
food.ingredient Linseed Oil Omasum Rumen Silage 03 medical and health sciences food Fish Oils Linseed oil Butyrivibrio Genetics Animals Lactation Sunflower Oil Food science 2. Zero hunger chemistry.chemical_classification biology Chemistry Sunflower oil Fatty Acids 0402 animal and dairy science 04 agricultural and veterinary sciences Fish oil biology.organism_classification Lipid Metabolism 040201 dairy & animal science Animal Feed Diet Gastrointestinal Microbiome 030104 developmental biology Dietary Supplements Animal Science and Zoology Animal Nutritional Physiological Phenomena Cattle Female Food Science Polyunsaturated fatty acid |
| Zdroj: | Journal of dairy science. 101(4) |
| ISSN: | 1525-3198 |
| Popis: | Fish oil (FO) alters ruminal biohydrogenation causing trans fatty acid (FA) intermediates to accumulate, but the effects of 18-carbon polyunsaturated FA supply on ruminal long-chain FA metabolism and microbial communities in cattle fed FO are not well established. Four cows fitted with rumen cannula were used in a 4 × 4 Latin square with 21-d experimental periods to evaluate the effects of FO alone or in combination with plant oils high in 18:2n-6 or 18:3n-3 on rumen microbial ecology and flow of FA at the omasum. Treatments comprised a basal grass silage-based diet containing no additional oil (control) or supplements of FO (200 g/d) or FO (200 g/d) plus 500 g/d of sunflower oil (SFO) or linseed oil (LFO). Flow of FA was determined using the omasal sampling technique. The relative abundance of key biohydrogenating bacteria was assessed by quantitative PCR on 16S rRNA genes in omasal digesta. Fish oil-supplemented treatments increased the amounts of trans-18:1, trans-18:2, and 20- to 22-carbon polyunsaturated FA escaping the rumen. Relative to the control, oil supplements had no effect on the amount of 18:0 leaving the rumen, but LFO decreased the flow of 18:0 at the omasum compared with SFO. Both SFO and LFO increased trans-18:1 relative to FO, whereas LFO resulted in the highest trans-18:2 and 20- to 22-carbon FA flow. Supplements of FO plus plant oils shifted biohydrogenation toward trans-10 18:1 formation. Compared with FO alone, the ruminal metabolism of 22:6n-3 in the rumen of lactating cows is more extensive on diets containing higher amounts of 18-carbon polyunsaturated FA. However, the biohydrogenation of 22:5n-3 was less extensive in LFO than SFO, but showed no difference between FO and diets containing plant oils. Ruminal outflow of 20:5n-3 was not altered when plant oils were added to FO. Alterations in the amount of intermediates at the omasum or ruminal biohydrogenation pathways were not accompanied by major changes in analyzed bacterial populations. In conclusion, dietary supplements of FO alone or in combination with plant oils increase the amount of biohydrogenation intermediates containing 1 or more trans double bonds escaping the rumen, which may have implications for host metabolism and the nutritional quality of ruminant foods. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|