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The content of lignin and hemicellulose of silages from different genotypes of sorghum biomass.

G. M. Dallago




The content of lignin and hemicellulose of silages from different genotypes of sorghum biomass.
F. J. Ferreira1, D. E. P. Oliveira1, G. M. Dallago*2, C. S. Bonf�1, M. A. Magalh�es1. 1Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina, MG, Brazil, 2McGill University Sainte-Anne-de-Bellevue, QC, Canada.

In countries with a tropical climate, seasonal productivity of forage is one of the most important factors limiting animal performance under grazing systems, which prevents animals from expressing their maximum genetic potential. Therefore, it is important to search for alternative feedstuff that would meet the demand for roughages during periods of scarcity, such as the sorghum biomass. The objective of this study was to analyze the content of lignin and hemicellulose of silages of different genotypes of sorghum biomass. We evaluated 8 new genotypes of sorghum biomass (B004, B005, B009, B010, B011, B013, B015, and B020), one commercial genotype of sorghum biomass (K1009), and 2 non-biomass commercial genotypes of sorghum that are commonly used for silage (BRS655 and Volumax). The experiment was conducted using a randomized design with different genotypes as treatment and with 4 repetitions of each treatment. The material was ensiled using PVC silos that were kept closed for 45 d. Then, the silos were opened and we measured the content of hemicellulose and lignin. The data were analyzed using one-way ANOVA followed by the Tukey test (∝ < 0.05). Statistically significant differences (P < 0.05) and great variability were found between the genotypes for both cell wall components. The average hemicellulose content ranged from 23.6% to 28.6% and the average lignin content varied between 4.5% and 6.5%. Among the biomass genotypes, the genotype B020 had one of the lowest contents of hemicellulose (mean � standard deviation = 25.0 � 0.44) and lignin (4.5 � 0.47), with the latter being lower than the commercial biomass genotype (P < 0.05). In conclusion, the biomass genotype B020 is a possible candidate for usage in the feeding of ruminant animals because its low hemicellulose and lignin content would not limit its intake and digestibility.

Keywords: alternative feedstuff, feedstuff scarcity, ruminants.

Biography: I hold a Bachelor's and a Master's degree in Animal Science both from the Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil. I am currently an Animal Science Ph.D. student at McGill University — Macdonald Campus, Sainte-Anne-de-Bellevue, Quebec, Canada.