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Effect of forage processor roll-gap settings and storage length on the fermentation profile, nitrogen fractions, and kernel processing score of whole-plant corn silage harvested at different maturities.

B. A. Saylor

Events

06-24-2020

Abstract:

370
Effect of forage processor roll-gap settings and storage length on the fermentation profile, nitrogen fractions, and kernel processing score of whole-plant corn silage harvested at different maturities.
B. A. Saylor*1, E. C. Diepersloot1, L. G. Ghizzi1,2, J. O. Gusmao1,3, C. Heinzen Jr.1, C. L. McCary1, M. R. Pupo1, H. Sultana1, L. F. Ferraretto1. 1Department of Animal Sciences, University of Florida Gainesville, FL, 2Department of Animal Nutrition and Animal Production, University of S�o Paulo Pirassununga, S�o Paulo, Brazil, 3Department of Animal Science, Federal University of Lavras Lavras, Minas Gerais, Brazil.

The objective of this study was to assess the effect of forage processor roll-gap settings and storage length on the fermentation profile, N fractions, and kernel processing score of whole-plant corn silage harvested at different maturities. Samples from a single corn silage hybrid at 3 harvest maturities [1/4, 1/2, and 3/4 kernel milk line (early, intermediate, and late, respectively)] with 2 roll-gap settings (1 and 3 mm) on a forage harvester were collected at harvest and stored in quadruplicate vacuum pouches for 0, 30, 120, or 240 d. Data were analyzed as a split-split-plot design using the MIXED procedure of SAS. Concentrations of DM tended to differ (P = 0.09) among maturities and averaged 30.4, 31.8, and 37.4% for early, intermediate, and late maturity silages, respectively. There was a maturity � storage length interaction for pH (P = 0.02) and lactic acid concentrations (P = 0.05). Silage pH was similar among maturities at 30 and 120 d, but was greater in late maturity silage at 240 d. Concentrations of lactic acid were similar among maturities at 30 and 120 d, but were greater in intermediate maturity silage compared with late maturity silage at 240 d. Concentrations of acetic, propionic, and total acids were unaffected (P > 0.05) by treatments. Concentrations of soluble CP increased (P < 0.001) from 20.4 to 44.5% of CP as storage increased from 0 to 240 d. A maturity � storage length interaction was observed (P = 0.01) for ammonia-N (% of N) concentrations; with no differences observed at 0, 30, and 120 d, but with greater concentrations in intermediate maturity silage at 240 d. Concentrations of WSC decreased (P < 0.001) from 13.3 to 1.9% of DM as storage increased from 0 to 240 d. Kernel processing score increased (P = 0.01) from 62.4 to 67.7% of starch passing through a 4.75-mm screen as storage increased from 0 to 240 d. These results reaffirm the effects of prolonged fermentation on silage nitrogen fractions and suggest that prolonged fermentation may increase kernel processing score.

Keywords: corn silage, maturity, roll-gap.

Biography: Benjamin is a Ph.D. student in Animal Sciences at the University of Florida. Originally from Chandler, AZ, he received his B.S. in Animal Sciences from the University of Arizona and his M.S. in Animal Sciences from Kansas State University.