RUMINAL KINETICS OF TROPICAL FORRAGES SUBMITTED OR NOT TO IRRIGATION

Authors

  • V. S. Oliveira Universidade Federal da Bahia, Salvador, BA
  • J. A. S. Morais Universidade Federal de Sergipe, São Cristóvão, SE
  • E. N. Muniz Embrapa Tabuleiros Costeiros, Aracaju, SE, Brasil
  • J. L. Fagundes Universidade Federal de Sergipe, São Cristóvão, SE
  • I. G. S. Lima Universidade Federal de Sergipe, São Cristóvão, SE
  • J. S. Santana Universidade Federal de Sergipe, São Cristóvão, SE
  • C. B. Santos Universidade Federal de Sergipe, São Cristóvão, SE

DOI:

https://doi.org/10.17523/bia.v74n3p195

Keywords:

Andropogon gayanus, ruminal degradation, lag time.

Abstract

This study evaluated the chemical composition and kinetics of ruminal fermentation of four forage species submitted or not to irrigation. The species evaluated were Urochloa brizantha cv. MG5 (MG-5), Andropogon gayanus (Andropogon), Urochloa humidicola (Humidicola), and Digitaria umfolozi. The experiment was conducted on the Campus Rural experimental farm, São Cristóvão, SE. Significant differences (P<0.0001) were observed in the content of dry matter (DM), organic matter (OM), crude protein (CP), nonfibrous carbohydrates (NFC), hemicellulose, acid detergent fiber (ADF), cellulose, and lignin. Andropogon exhibited higher DM, OM, CP, ADF and lignin concentrations. NFC and cellulose content was higher in MG-5 grass. A significant difference (P=0.0002 and P=0.0004) was observed in the rate of DM and OM disappearance, respectively. These rates were higher in D. umfolozi and Humidicola, as well as in irrigated versus non-irrigated forages. There was a significant difference in cumulative gas volume which was higher in Andropogon and MG-5 compared to the other forages. Significant differences were also found in the fermentation parameters, with Andropogon grass exhibiting a lower volume and rate of gas production from the fractions of fast and slow digestion, as well as a higher lag time. Irrigation does not affect the fermentation parameters of forages and reduces their DM and CP content. The higher protein and lignin content and lower NFC content observed in Andropogon reduced fermentation parameters and cumulative gas production over time. Humidicola exhibits a higher volume of gas produced, as well as a higher gas volume from the faster- and slowerdigesting fractions and the highest gas production from these fractions

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Published

2017-11-01

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

RUMINAL KINETICS OF TROPICAL FORRAGES SUBMITTED OR NOT TO IRRIGATION. (2017). Bulletin of Animal Husbandry, 74(3), 195-204. https://doi.org/10.17523/bia.v74n3p195

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