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dc.creatorOliveira, Cristhiane V. R. de-
dc.creatorSilva, Tadeu E.-
dc.creatorBatista, Erick D.-
dc.creatorRennó, Luciana N.-
dc.creatorSilva, Fabyano F.-
dc.creatorCarvalho, Isabela P. C. de-
dc.creatorMartín-Tereso, Javier-
dc.creatorDetmann, Edenio-
dc.date.accessioned2021-07-16T16:40:06Z-
dc.date.available2021-07-16T16:40:06Z-
dc.date.issued2020-06-
dc.identifier.citationOLIVEIRA, C. V. R. de et al. Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage. British Journal of Nutrition, Cambridge, v. 124, n. 11, p. 1166-1178, Dec. 2020. DOI: 10.1017/S0007114520002251.pt_BR
dc.identifier.urihttps://doi.org/10.1017/S0007114520002251pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/46768-
dc.description.abstractWe evaluated the differences between the supplementation of urea in rumen and/or abomasum on forage digestion, N metabolism and urea kinetics in cattle fed a low-quality tropical forage. Five Nellore heifers were fitted with rumen and abomasum fistulas and assigned to a Latin square design. The treatments were control, continuous infusion of urea in the abomasum (AC), continuous infusion of urea in the rumen, a pulse dose of urea in the rumen every 12 h (PR) and a combination of PR and AC. The control exhibited the lowest (P < 0·10) faecal and urinary N losses, which were, overall, increased by supplementation. The highest urinary N losses (P < 0·10) were observed when urea was either totally or partially supplied as a ruminal pulse dose. The rumen N balance was negative for the control and when urea was totally supplied in the abomasum. The greatest microbial N production (P < 0·10) was obtained when urea was partially or totally supplied in the abomasum. Urea supplementation increased (P < 0·10) the amount of urea recycled to the gastrointestinal tract and the amount of urea-N returned to the ornithine cycle. The greatest (P < 0·10) amounts of urea-N used for anabolism were observed when urea was totally and continuously infused in the abomasum. The continuous abomasal infusion also resulted in the highest (P < 0·10) assimilation of microbial N from recycling. The continuous releasing of urea throughout day either in the rumen or abomasum is able to improve N accretion in the animal body, despite mechanism responsible for that being different.pt_BR
dc.languageenpt_BR
dc.publisherCambridge University Presspt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceBritish Journal of Nutritionpt_BR
dc.subjectPost-ruminal supplementationpt_BR
dc.subjectGastrointestinal tractpt_BR
dc.subjectNeutral-detergent fibrept_BR
dc.subjectNon-protein Npt_BR
dc.subjectOrganic matterpt_BR
dc.subjectUrea N entry ratept_BR
dc.subjectVolatile fatty acidspt_BR
dc.subjectBovinos - Alimentaçãopt_BR
dc.subjectSuplementação alimentarpt_BR
dc.subjectUréia na suplementação de ruminantespt_BR
dc.subjectTrato gastrointestinalpt_BR
dc.subjectFibra em detergente neutropt_BR
dc.subjectMatéria orgânicapt_BR
dc.subjectÁcidos graxos voláteispt_BR
dc.titleUrea supplementation in rumen and post-rumen for cattle fed a low-quality tropical foragept_BR
dc.typeArtigopt_BR
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