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Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage

  • Cristhiane V. R. de Oliveira (a1), Tadeu E. Silva (a1), Erick D. Batista (a2), Luciana N. Rennó (a1), Fabyano F. Silva (a1), Isabela P. C. de Carvalho (a3), Javier Martín-Tereso (a3) and Edenio Detmann (a1)...

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.

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Corresponding author

*Corresponding author: Professor Edenio Detmann, email detmann@ufv.br

References

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Keywords

Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage

  • Cristhiane V. R. de Oliveira (a1), Tadeu E. Silva (a1), Erick D. Batista (a2), Luciana N. Rennó (a1), Fabyano F. Silva (a1), Isabela P. C. de Carvalho (a3), Javier Martín-Tereso (a3) and Edenio Detmann (a1)...

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