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- Title
In vitro ruminal degradation of carbohydrate fractions in tropical grasses fertilized with nitrogen.
- Authors
Hernández, Erika Andrea; Lagunes, Francisco Indalecio Juárez; Pell, Alice N.; Lagunes, Maribel Montero; Rodríguez, Juan Manuel Pinos; Blake, Robert W.
- Abstract
The goal was to determine the digestion rates of carbohydrate fractions A (sugars, oligosaccharides and organic acids), B1 (starch and soluble fiber), NSC (non-structural carbohydrates) and B2 (available NDF) in four tropical grasses using the gas production technique. Samples of whole forage (WF), residue insoluble in 90% ethanol (EIR) and isolated NDF (iNDF) were fermented in vitro and gas production measured. Gas volumes were determined from the following fractions, A = WF minus EIR; B1 = EIR - ND; NSC = WF - iNDF; and B2 = iNDF. Grasses were Andropogon gayanus, Urochloa brizantha, Cynodon plectostachyus, and Megathyrsus maximus each grown in Veracruz, Mexico on four plots (5X5 m), fertilized (relationship equivalent to 0 and 100 kg N/ha) and clipped 35 d after the N fertilization. A complete randomized block design with factorial arrangement 4X2 and two replicates per treatment was used. Factors were grass species and N fertilization. Data were fit using a single-pool exponential model with lag. The volume (mL gas/100 mg OM), rate (%/h) and lag (h) were: WF (22.8; 5.3; 2.1); A (3.2; 15.7; 0.5); B1 (1.5; 15.7; 0.2); and B2 (18.3; 6.6; 5.2). Andropogon and Urochloa had higher NSC content compared to Megathyrsus and Cynodon but lower gas yield per unit of NSC. Rates of digestion for the B2 fraction ranged from 4 to 8 %/h; and NSC digestion rate averaged 15.7 %/h. Nitrogen fertilization reduced carbohydrate pool sizes but did not affect rates of digestion. It is concluded that the rates of digestion of the carbohydrate fractions differs by grass specie.
- Subjects
CARBOHYDRATES; FRACTIONS; GRASSES; ORGANIC acids; FACTORIAL experiment designs; OLIGOSACCHARIDES
- Publication
Revista Mexicana de Ciencias Pecuarias, 2020, Vol 11, Issue 1, p266
- ISSN
2007-1124
- Publication type
Article
- DOI
10.22319/rmcp.v11i1.4829