Resumo

PORTILLA PINZON, Danilo; BARRAGAN HERNANDEZ, Wilson; CARVAJAL-BAZURTO, Christian  e  CAJAS GIRON, Yasmin. Estimation of the quality of the diet in silvopastoral systems through the quantification of fecal nitrogen. rev. colombiana cienc. anim. Recia [online]. 2019, vol.11, n.1, pp.17-27. ISSN 2027-4297.  https://doi.org/10.24188/recia.v11.n1.2019.691.

In order to evaluate the quality of the diet consumed by bovines in multiestrata silvopastoral systems (SSP) through estimation fecal nitrogen's (NF), were compared four silvopastoral arrangements with variation in their vegetal composition versus a treeless prairie (M. maximum). Each arrangement was composed by shrubs (L. leucocephala y C. cujete), trees (A. saman, G. ulmifolia y C. grandis) and timbers species (P. quinata y S. macrophylla). Four cow Romosinuano x Holstein x Cebu (436±64,2 kg) were assigned in each treatment. In each cow feces were collected directly from the rectum. The samples were dried and analyzed for nitrogen (total, soluble and insoluble in NDF), NDF and the organic matter. Te information obtained in NF was used for estimated the fecal crude protein (FCP), crude protein (CP) and digestibility in intake of each SSP. Te NF presented as FCP was affected by treatment (p<0.1). Te treatment Pasto-Arbust-Arbor-Mad showed the higher value (132.19 g.kg MO-1) significantly different from treatment Pasto, Pasto-Arbust y Pasto-Arbor, with 119.77, 116.77 y 118.91 g.kg MO-1 respectively. MO, NDF and the soluble and insoluble nitrogen no showed statistical difference between treatments. Te intake digestibility and CP estimated through NF ranged from 61.45% to 65.24% and from 10.28 to 12.02 respectively. NF quantification allowed to show the quality of intake in the complex plant structure of the silvopastoral systems.

Palavras-chave : Fecal organic matter; forage quality; protein; tree; shurbs.

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