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Interactions of unsaturated fat or coconut oil with Rumensin on milk fat production might be mediated through inhibition of specific protozoal genera

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/24723

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dc.contributor Karnati, S. K. R.
dc.contributor Ribeiro, C. V. D. M.
dc.contributor Oelker, E. R.
dc.contributor Mathew, B.
dc.contributor Drow, C. M.
dc.contributor Homerosky, E. R.
dc.contributor.advisor Firkins, Jeffrey L.
dc.creator Reveneau, Carine
dc.date.accessioned 2007-04-02T13:29:33Z
dc.date.available 2007-04-02T13:29:33Z
dc.date.issued 2007-04-02T13:29:33Z
dc.identifier.uri http://hdl.handle.net/1811/24723
dc.description.abstract Feeding animal-vegetable (AV) fat or medium chain FA to dairy cows can decrease rumen protozoal count. In contrast, AV fat with Rumensin (R) can promote milk fat depression (MFD), whereas diets supplemented with coconut oil (CO; rich in medium chain FA) + R were not expected to cause MFD. In a 6x6 Latin square design, 6 rumen-cannulated cows were fed with +/-R (260 mg/d) and either: control (no fat), 5% AV, or 5% CO. The log10 of concentrations of total protozoa (cells/ml) were not different from control (5.97) vs. AV (5.95) but decreased by 93% with CO (4.79). Isotricha and Entodinium decreased by 99 and 97% by CO, whereas Epidinium was unchanged. In contrast, Epidinium were 67% lower for the main effect of +R and decreased 92% when AV was supplemented with R. Total VFA concentration was not affected by diet, but the A:P ratio decreased for CO (1.85) vs. control (2.95) or AV (2.58). The low A:P ratio was associated with a decreased total tract digestibility of NDF for CO (35.5%) vs. control (53.3%) and AV (46.5), with no difference in OM digestibility (averaging 67.9%). DMI was 5 kg/d lower with CO (15.3 kg/d). Milk production was lower with +R (31.6 kg/d) and CO (30.3 kg/d) than AV (33.0 kg/d). MFD occurred with AV+R and CO: 1.08, 1.01, 0.71, 1.05, 0.87, and 0.74 kg/d for control, AV, CO, control+R, AV+R, and CO+R, respectively. Further analyses should elucidate the role of protozoal concentration and genera on bacterial ruminal biohydrogenation. en
dc.description.sponsorship USDA/NRICGP Grant 2003–35206-12872 en
dc.format.extent 1302377 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation Animal Sciences en
dc.relation.ispartofseries Interdisciplinary Ph.D. Program in Nutrition - OSUN. Graduate student poster competition, 2007 en
dc.subject Protozoal Inhibition en
dc.subject Milk Fat Depression en
dc.title Interactions of unsaturated fat or coconut oil with Rumensin on milk fat production might be mediated through inhibition of specific protozoal genera en
dc.type Presentation en