131229 20240206154530.0 doi 10.1016/j.anifeedsci.2005.04.018 sideral 55697 ART-2005-55697 eng Mota, M. Universidad de Zaragoza Evaluation of four tropical browse legumes as nitrogen sources: Comparison of in vitro gas production with other methods to determine N degradability 2005 The value of the tropical browse legumes Acacia cornigera (ACA), Albizia lebbekoides (ALB), Enterolobium cyclocarpum (ENT) and Leucaena leucocephala (LEU) as ruminal N sources was examined. The N content (g/kg dry matter) was 38.0, 28.6, 35.1 and 46.7, and acid detergent insoluble N (ADIN; g/kg dry matter) was 9.0, 10.7, 18.7 and 19.8 for ACA, ALB, ENT and LEU, respectively. In vitro gas production at 24 h ranked ACA > ENT > LEU > ALB (P < 0.001), except that there were no differences between ENT and LEU after 12 h of incubation. The N degradability was estimated by the in vitro relationship between gas production and ammonia N concentration (NDg), N disappearance from incubation residue (NDd), and incubation with Streptomyces griseus enzymes (NDe). To determine NDg, legume samples (601 ± 0.54 mg) were incubated with 0 mg (n = 3), 150 mg (n = 2) or 300 mg (n = 2) starch for 24 h in two experiments. Regression of ammonia (y, mg) on gas produced (x, ml) for each browse in each experiment (n = 7) yielded r2 coefficients between 0.974 and 0.997. Average estimated NDg were 0.32, 0.22, 0.63 and 0.22 for ACA, ALB, ENT and LEU, whereas NDd had N digestion coefficients of 0.40, 0.17, 0.70 and 0.36, and NDe 0.41, 0.24, 0.44 and 0.36, respectively. NDg was lower than NDd and NDe for LEU, but higher than NDe for ENT (P < 0.05). However, methods correlation ranged from 0.73 to 0.92. In vitro estimated N digestion suggested that 0.52, 0.17, 0.30 and 0.41 of undegraded N from ACA, ALB, ENT and LEU was intestinally digestible. info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 1.121 2005 AGRICULTURE, DAIRY & ANIMAL SCIENCE 13 / 42 = 0.31 2005 Q2 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Rodriguez, R. Solanas, E. Universidad de Zaragoza (orcid)0000-0001-8056-5236 Fondevila, A. Universidad de Zaragoza (orcid)0000-0002-0712-1185 2008 700 Universidad de Zaragoza Dpto. Produc.Animal Cienc.Ali. Área Producción Animal 2008 X Universidad de Zaragoza Dpto. Produc.Animal Cienc.Ali. Proy. investigación HTA 123-124, Part 1 (2005), 341-350 Anim. feed sci. technol. Animal Feed Science and Technology 0377-8401 177437 http://zaguan.unizar.es/record/131229/files/texto_completo.pdf Versión publicada 1493441 http://zaguan.unizar.es/record/131229/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:131229 articulos driver 2024-02-06-14:51:52 ARTICLE