Effect of grazing management strategies on the yield and nutritional value of Marandu grass in the semiarid of Brazil

Autores/as

DOI:

https://doi.org/10.5433/1679-0359.2021v42n4p2503

Palabras clave:

Cattle, Degradability, Morphology, Sward height, Urochloa brizantha.

Resumen

The objective of this study was to evaluate the effects of two grazing management strategies on structural, productive and nutritional parameters of Marandu grass (Urochloa brizantha cv. Marandu). A completely randomized block design with two pasture management strategies and eight replications (blocks) was used. The grazing management strategies were: (1) low intensity rotational grazing (LI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 24 cm, i.e., a defoliation intensity of 50%; (2) High intensity rotational grazing (HI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 10 cm (±70% defoliation intensity). Pastures were sampled before and after grazing for estimation of forage mass, forage accumulation rate, structural characteristics, nutritional value and dry matter intake. The LI strategy resulted in higher dry matter production than HI before (18.33%) and after grazing (49.06%), increasing pre-grazing forage density by 13.21% (P < 0.05). The production of potentially digestible dry matter was highest (P < 0.05) in LI strategy (21.3% before and 39.6% after grazing, respectively). Higher post-grazing green forage mass (45%) increased the residual crude protein in LI. The LI management strategy increased forage mass production and can be used in Marandu grass pastures.

Biografía del autor/a

Maria Catiane Araújo Silva Veloso, Universidade Estadual de Montes Claros

Student of Animal Science Master's Course Postgraduate Program in Animal Science, Universidade Estadual de Montes Claros, UNIMONTES, Janaúba, MG, Brazil.

Eleuza Clarete Junqueira de Sales, Universidade Estadual de Montes Claros

Profa Dra, Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Flávio Pinto Monção, Universidade Estadual de Montes Claros

Prof. and Researcher PNPD/Capes, Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Vicente Ribeiro Rocha Júnior, Universidade Estadual de Montes Claros

Prof. Dr., Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Virgílio Mesquita Gomes, Universidade Estadual de Montes Claros

Prof. Dr., Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Dorismar David Alves, Universidade Estadual de Montes Claros

Prof. Dr., Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Sidnei Tavares dos Reis, Universidade Federal de Minas Gerais

Prof. Dr., Universidade Federal de Minas Gerais, UFMG, Montes Claros, MG, Brazil.

João Paulo Sampaio Rigueira, Universidade Estadual de Montes Claros

Prof. Dr., Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

Amanda Maria Silva Alencar, Universidade Estadual de Montes Claros

Student of Animal Science Master's Course Postgraduate Program in Animal Science, Universidade Estadual de Montes Claros, UNIMONTES, Janaúba, MG, Brazil.

Ignacio Aspiazú, Universidade Estadual de Montes Claros

Prof. Dr., Postgraduate Program in Animal Science, UNIMONTES, Janaúba, MG, Brazil.

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Publicado

2021-05-20

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Veloso, M. C. A. S., Sales, E. C. J. de, Monção, F. P., Rocha Júnior, V. R., Gomes, V. M., Alves, D. D., … Aspiazú, I. (2021). Effect of grazing management strategies on the yield and nutritional value of Marandu grass in the semiarid of Brazil. Semina: Ciências Agrárias, 42(4), 2503–2522. https://doi.org/10.5433/1679-0359.2021v42n4p2503

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