Nitrogen balance of bullocks fed Cratylia argentea and Brachiaria arrecta Hay

Autores/as

  • Braulio Valles de la Mora Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia, Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical. http://orcid.org/0000-0003-3296-5627
  • Epigmenio Castillo-Gallegos Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical, FMVZ, UNAM

DOI:

https://doi.org/10.19136/era.a5n15.1491

Resumen

Four experimental diets or treatments formed with incremental proportions of the foliage of tropical shrub legume Cratylia argentea and decremental proportions of Tanner grass (Brachiaria arrecta) hay: T1, 0:100; T2, 15:85; T3, 30:70; and T4, 45:55 were evaluated using four Holstein-Zebu bullocks (214.5 9.3 kg) conned in individual pens, under a balanced 4 x 4 latin square design. The crude protein (CP, %) content of C. argentea was 19.3 ± 6%, and in the grass was 6.2 ± 3%. The intake of DM increased as the C. argentea level in the diet increased. Blood urea-N (BUN) showed a linear increase from T1 to T4, observing its highest concentration at feeding time and six-hours after in T4: 12.00 and 14.75 mg dL-1, respectively. Purine derivatives (uric acid and allantoin) were not affected by treatments (p > 0.05). The increase of the legume in the diet improved the DM intake and digestibility, and led to N-balance from negative in T1 and T2, to positive in T3 and T4. The legume proportion in a basal diet of the grass B. arrecta must be 30% at least.

Biografía del autor/a

Braulio Valles de la Mora, Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia, Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical.

Centro de Enseñanza, Investigación y Extensión en Ganadería Tropical.

Profesor titular "C", tiempo completo, definitivo.

Publicado

2018-09-03

Cómo citar

Valles de la Mora, B., & Castillo-Gallegos, E. (2018). Nitrogen balance of bullocks fed Cratylia argentea and Brachiaria arrecta Hay. Ecosistemas Y Recursos Agropecuarios, 5(15), 523-536. https://doi.org/10.19136/era.a5n15.1491

Número

Sección

ARTÍCULOS CIENTIFICOS