The impact of hydrolyzing and oxidizing agents on chemical composition and digestibility of various high-fibre forages

BRAVO RODRIGO DAMIÁN; MARTÍNEZ MARCELA FERNANDA; MICCOLI FLORENCIA E.; MENGHINI, MARIANO; MARTÍNEZ MARCELA FERNANDA; ARELOVICH HUGO MARIO; MENGHINI, MARIANO; ARELOVICH HUGO MARIO; BRAVO RODRIGO DAMIÁN; MICCOLI FLORENCIA E.

GRASS AND FORAGE SCIENCE (PRINT)

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 vol. 73 p. 705 - 716

0142-5242

Urea (U), sodium hypochlorite (H) and sodium chloride (S) alone or combined wereapplied upon high-fibre forages (HFF) in three experiments. Experiment (Exp) I: tallwheatgrass (TW), weeping lovegrass (WL), deferred sorghum (DS) and barley straw(BS) as substrates were untreated (U0) or treated with 4 g 100 g1 DM (U4), andstored for 45 days. Within each forage, CP and IVDMD were increased by U4(p < 0.01). Exp II: TW was treated with U and H: U (as in Exp I) and H (at 0, 0.25,0.50, 0.75 and 1 g active Cl 100 g1 DM), alone or combined. The interaction U*Hwas significant for ADF, ADL and CP. For U4+H0.25 ADF and ADL decreased(p < 0.01). For U0, ADL was reduced from H.025 through H1.00 (p < 0.05). U4increased IVDMD and CP (p < 0.01). Exp III: oat straw (O) was treated with U0 andU4, H0 and H1, S0 and S4 (4 g S 100 g1 DM), including all combinations at 3 storagetimes (T = 10, 20 and 30 days). Interactions U*S*H*T for ADL, U*H*T for NDFand CP and S*H*T for IVDMD (p < 0.05) were found. ADF was reduced by U4, H1and S1 (p < 0.01). The greatest decrease (4.5%) was with U4. Principal componentsanalysis showed U4S4H1 highly related to IVDMD for all T. All treatments had littleor no impact on NDF, ADF and ADL content. Lower quality forages had greatestimprovements in digestibility and N-retention.