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Tropical Animal Health and Production

, Volume 50, Issue 4, pp 715–720 | Cite as

Efficiency of nitrogen metabolism in beef cattle grazing pasture and supplemented with different protein levels in the rainy season

  • Renata Pereira da Silva-Marques
  • Joanis Tilemahos Zervoudakis
  • Luciana Keiko Hatamoto-Zervoudakis
  • Pedro Ivo José Lopes da Rosa e Silva
  • Núbia Bezerra do Nascimento Matos
  • Andresa Lazzarotto Feliciano
  • Rones Goulart de Paula Júnior
  • Luciano da Silva Cabral
Regular Articles
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Abstract

Supplementation of animals in the rainy season is essential to maximise weight gain. Thus, the objective was to evaluate the effects of supplementation with low-, medium- and high-protein levels on nutritional parameters of grazing beef cattle in the rainy season. Eight rumen-cannulated Nellore bulls (437 kg body weight) were used in a 4 × 4 double Latin square design with four supplements and four experimental periods. The treatments were mineral supplement (ad libitum) and supplements with low-protein (LPSU), medium-protein (MPS) and high-protein (HPS) levels, providing 106, 408 and 601 g/day of crude protein (CP), respectively. There was no difference (P > 0.05) between treatments for dry matter and forage intake, ruminal pH, ruminal ammonia nitrogen (RAN) at time 0 (before supplementation) and microbial protein yield. Animals on MPS had a higher (P > 0.05) intake and digestibility of CP, higher RAN levels (3 and 6 h after supplementation), increased nitrogen intake and a better nitrogen balance than animals on LPSU. The HPS provided higher (P > 0.05) RAN at time 6 and a better nitrogen balance when compared with MPS. We therefore infer that the high-protein supplement positively impacts nitrogen metabolism and efficiency in grazing beef cattle during the rainy season.

Keywords

Bulls Forage Protein Ruminal fermentation Supplementation 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  • Renata Pereira da Silva-Marques
    • 1
  • Joanis Tilemahos Zervoudakis
    • 1
  • Luciana Keiko Hatamoto-Zervoudakis
    • 1
  • Pedro Ivo José Lopes da Rosa e Silva
    • 1
  • Núbia Bezerra do Nascimento Matos
    • 2
  • Andresa Lazzarotto Feliciano
    • 3
  • Rones Goulart de Paula Júnior
    • 1
  • Luciano da Silva Cabral
    • 1
  1. 1.Programa de Pós Graduação em Ciência AnimalUniversidade Federal de Mato GrossoCuiabáBrazil
  2. 2.Faculdade de Medicina VeterináriaUniversidade Federal de Mato GrossoCuiabáBrazil
  3. 3.Faculdade de Agronomia e ZootecniaUniversidade Federal de Mato GrossoCuiabáBrazil

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