Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/46768
Title: Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage
Keywords: Post-ruminal supplementation
Gastrointestinal tract
Neutral-detergent fibre
Non-protein N
Organic matter
Urea N entry rate
Volatile fatty acids
Bovinos - Alimentação
Suplementação alimentar
Uréia na suplementação de ruminantes
Trato gastrointestinal
Fibra em detergente neutro
Matéria orgânica
Ácidos graxos voláteis
Issue Date: Jun-2020
Publisher: Cambridge University Press
Citation: OLIVEIRA, 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.
Abstract: We 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.
URI: https://doi.org/10.1017/S0007114520002251
http://repositorio.ufla.br/jspui/handle/1/46768
Appears in Collections:DZO - Artigos publicados em periódicos

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.