Estimación de la proteína no degradable en el rumen de pastos de la montaña leonesa empleando el CNCPS (Cornell)
- C. Valdés
- S. Andrés
- F.J. Giráldez
- R. García
- R. Peláez
- A. Calleja
- López-Carrasco Férnandez, Celia (coord.)
- María del Pilar Rodríguez Rojo (coord.)
- Alfonso San Miguel Ayanz (coord.)
- Federico Fernández González (coord.)
- Sonia Roig Gómez (coord.)
Publisher: Sociedad Española para el Estudio de los Pastos
ISBN: 978-84-614-8713-4
Year of publication: 2011
Pages: 401-406
Congress: Sociedad Española para el Estudio de los Pastos. Reunión Científica (50. 2011. null)
Type: Conference paper
Abstract
The objective of this study was to utilize the Cornell net carbohydrate and protein system(CNCPS) nitrogen fractions as a basis for estimating forage rumen undegraded protein (RUP) contents.Twenty- nine different herbage samples of irrigated fertilized meadow located at themountain of León were analyzed for: total nitrogen (total N), nitrogen in trichloroacetic acid precipitatedmatter (NTCA), borate-phosphate buffer insoluble nitrogen (BFIN), neutral-detergent insolublenitrogen (NDIN) and acid-detergent insoluble nitrogen (ADIN). These data were used tocalculate the partition of nitrogen fractions proposed by the Cornell Net Carbohydrate and ProteinSystem (CNCPS): A (total N- NTCA), B1 (NTCA-BFIN), B2 (BFIN-NIDN), B3 (NIDN-ADIN) and C(ADIN). Herbage samples were also incubated in situ and rumen undegraded protein (RUP) were estimated at 0·02/h, 0·04/h, 0·06/h and 0·08/h ruminal passage rates (RUP2, RUP4, RUP6 andRUP8, respectively). Multiple regression equations based on B2, B3 y C CNCPS fractions onlyexplain 56·2, 64·5, 67·2 and 68·8 %, respectively, of the variation in RUP2, RUP4, RUP6 andRUP8.