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Effects of the comminution rate and microbial contamination of particles in the rumen on accuracy of in situ estimates of digestion of protein and amino acids of dehydrated sugar beet pulp

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Effects of the comminution rate and microbial contamination of particles in the rumen on accuracy of in situ estimates of digestion of protein and amino acids of dehydrated sugar beet pulp

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dc.contributor.author González, Javier es_ES
dc.contributor.author Arroyo, José M es_ES
dc.contributor.author Guevara González, Jesús Alberto es_ES
dc.contributor.author Moubi, Rabiaa es_ES
dc.contributor.author Piquer Querol, Olga es_ES
dc.contributor.author Moya, V.J. es_ES
dc.date.accessioned 2016-09-05T11:13:34Z
dc.date.available 2016-09-05T11:13:34Z
dc.date.issued 2014-02
dc.identifier.issn 0021-8596
dc.identifier.uri http://hdl.handle.net/10251/68725
dc.description.abstract [EN] Effects of the correction of microbial contamination (using N-15 techniques) and of considering the comminution rate (k (c)) of particles in the rumen on effective estimates of the ruminally undegraded (RU) fraction and its intestinal effective digestibility (IED) were examined in a sample of dehydrated sugar beet pulp (DBP) generating composite samples (from rumen-incubated residues) representative of the chemical composition of RU. Tested fractions were dry matter (DM), organic matter (OM, tested only for RU), crude protein (CP) and amino acids (AA). The study was performed on three rumen and duodenum cannulated wethers fed with a 2:1 (fresh weight basis) chopped oat hay-to-concentrate diet supplied at 40g DM/kg BW0 center dot 75 in six equal meals per day. The DBP showed sigmoid degradation kinetics: the fractional degradation rate increased by 5 center dot 8 times as time (h) increased from 0 to infinity. The k (c) rate (measured in the diet concentrate) represented 5 center dot 74% of the total rumen retention time of particles. As a result, the RU of DM was over-evaluated by 6 center dot 53% when k (c) was not considered. Microbial contamination of RU was high as in DM as in CP. Therefore, the overestimation of RU of DM was increased to 12 center dot 2% when this contamination was not corrected. The lack of this correction also led to large over-evaluations of RU and IED of CP and AA. As a result, the overestimation of the intestinal digested fraction was 40 center dot 9% for CP and 45 center dot 0% for total analysed AA. This overestimation varied largely among AA (from 18 center dot 9 to 88 center dot 7%). Corrected proportions of RU and IED were also variable among AA. Hypotheses on the causes of this variability are given. Resultant changes in the AA profile of the intestinal digested protein had some negative impact on the supply of essential AA and cysteine without affecting lysine. This problem is limited because the microbial protein synthesized from DBP fermentation in the rumen is largely predominant in the AA supply to the host. es_ES
dc.description.sponsorship This work was supported by the CICYT-funded Project AGL 2006-08300. Analyses of <SUP>15</SUP>N isotope ratios were performed at the Servicio Interdepartamental de Investigacion, Universidad Autonoma de Madrid. Spain. en_EN
dc.language Inglés es_ES
dc.publisher Cambridge University Press (CUP): STM Journals es_ES
dc.relation CICYT AGL 2006-08300 es_ES
dc.relation.ispartof Journal of Agricultural Science es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject DEGRADABILITY es_ES
dc.subject FEED es_ES
dc.subject DEGRADATION es_ES
dc.subject DIGESTIBILITY es_ES
dc.subject SHEEP es_ES
dc.subject FEEDSTUFFS es_ES
dc.subject RUMINANTS es_ES
dc.subject PASSAGE es_ES
dc.subject LIQUID es_ES
dc.subject MODEL es_ES
dc.title Effects of the comminution rate and microbial contamination of particles in the rumen on accuracy of in situ estimates of digestion of protein and amino acids of dehydrated sugar beet pulp es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1017/S0021859613000233
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ciencia Animal - Departament de Ciència Animal es_ES
dc.description.bibliographicCitation González, J.; Arroyo, JM.; Guevara González, JA.; Moubi, R.; Piquer Querol, O.; Moya, V. (2014). Effects of the comminution rate and microbial contamination of particles in the rumen on accuracy of in situ estimates of digestion of protein and amino acids of dehydrated sugar beet pulp. Journal of Agricultural Science. 1(152):166-174. doi:10.1017/S0021859613000233 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion https://dx.doi.org/10.1017/S0021859613000233 es_ES
dc.description.upvformatpinicio 166 es_ES
dc.description.upvformatpfin 174 es_ES
dc.type.version info:eu repo/semantics/publishedVersion es_ES
dc.description.volume 1 es_ES
dc.description.issue 152 es_ES
dc.relation.senia 266366 es_ES


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