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Abstract
Excessive levels of starch in diets for lactating dairy cattle is a known risk factor for milk fat depression, but little is known about how this risk is affected by differences in rates of starch degradability (Kd) in the rumen. The objective of this study was to compare accumulation of biohydrogenation intermediates causing milk fat depression, including conjugated linoleic acid (CLA), when corn with low or high Kd were fed to continuous cultures. Diets [ver mas...]
dc.contributor.authorLascano, Gustavo J.
dc.contributor.authorAlende, Mariano
dc.contributor.authorKoch, L.E.
dc.contributor.authorJenkins, Thomas C.
dc.date.accessioned2019-03-13T15:38:33Z
dc.date.available2019-03-13T15:38:33Z
dc.date.issued2016-08
dc.identifier.issn0022-0302
dc.identifier.otherhttps://doi.org/10.3168/jds.2016-11032
dc.identifier.urihttp://hdl.handle.net/20.500.12123/4594
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022030216303125?via%3Dihub
dc.description.abstractExcessive levels of starch in diets for lactating dairy cattle is a known risk factor for milk fat depression, but little is known about how this risk is affected by differences in rates of starch degradability (Kd) in the rumen. The objective of this study was to compare accumulation of biohydrogenation intermediates causing milk fat depression, including conjugated linoleic acid (CLA), when corn with low or high Kd were fed to continuous cultures. Diets contained (dry matter basis) 50% forage (alfalfa pellets and grass hay) and 50% concentrate, with either no added fat (LF) or 3.3% added soybean oil (HF). Within both the LF and HF diets, 3 starch degradability treatments were obtained by varying the ratio of processed (heat and pressure treatments) and unprocessed corn sources, giving a total of 6 dietary treatments. Each diet was fed to dual-flow continuous fermenters 3 times a day at 0800, 1600, and 2400 h. Diets were fed for four 10-d periods, with 7 d for adaptation and 3 d for sample collection. Orthogonal contrasts were used in the GLIMMIX procedure of SAS to test the effects of fat, starch degradability, and their interaction. Acetate and acetate:propionate were lower for HF than for LF but daily production of trans-10 18:1 and trans-10,cis-12 CLA were higher for HF than for LF. Increasing starch Kd from low to high increased culture pH, acetate, and valerate but decreased butyrate and isobutyrate. Changes in biohydrogenation intermediates (expressed as % of total isomers) from low to high starch Kd included reductions in trans-11 18:1 and cis-9,trans-11 CLA but increases in trans-10 18:1 and trans-10,cis-12 CLA. The results show that increasing the starch Kd in continuous cultures while holding starch level constant causes elevation of biohydrogenation intermediates linked to milk fat depression.eng
dc.formatapplication/pdfeng
dc.language.isoeng
dc.publisherAmerican Dairy Science Associationeng
dc.rightsinfo:eu-repo/semantics/restrictedAccesseng
dc.sourceJournal of dairy science 99 (8) : 6334-6341.(August 2016)eng
dc.subjectStarcheng
dc.subjectAlmidónes_AR
dc.subjectDegradationeng
dc.subjectDegradaciónes_AR
dc.subjectLipidseng
dc.subjectLípidoses_AR
dc.subject.otherBiohydrogenationeng
dc.subject.otherContinuous Cultureseng
dc.subject.otherCultivos Continuoses_AR
dc.titleChanges in fermentation and biohydrogenation intermediates in continuous cultures fed low and high levels of fat with increasing rates of starch degradabilityeng
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.description.origenInstituto de Fisiología y Recursos Genéticos Vegetaleses_AR
dc.description.filFil: Lascano, Gustavo J . Clemson University. Department of Animal and Veterinary Sciences; Estados Unidoses_AR
dc.description.filFil: Alende, Mariano. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Anguil; Argentina. Clemson University. Department of Animal and Veterinary Sciences; Estados Unidoses_AR
dc.description.filFil: Koch, L.E. Clemson University. Department of Animal and Veterinary Sciences; Estados Unidoses_AR
dc.description.filFil: Jenkins, Thomas C. Clemson University. Department of Animal and Veterinary Sciences; Estados Unidoses_AR
dc.subtypecientifico


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