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The evaluation of the potential of biomass sorghum silage added with sugarcane.

G. M. Dallago



The evaluation of the potential of biomass sorghum silage added with sugarcane.
D. E. P. Oliveira1, F. J. Ferreira1, G. M. Dallago*2, C. S. Bonfá1, M. A. Magalhães1. 1Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina, Minas Gerais, Brazil, 2McGill University Sainte-Anne-de-Bellevue, Quebec, Canada.

The seasonal production of forage is one of the main factors limiting animal performance in pasture-based systems under tropical climate conditions. It requires the search for alternative feedstuffs to offer animals during periods of forage scarcity to maximize animal performance. The objective of this study was to evaluate parameters of bromatological quality of silage of 3 genotypes of sorghum biomass (B012, B017, and B018) with 4 levels of sugarcane inclusion (0, 20, 40, and 60%). The experiment was conducted using a completely randomized design in a factorial scheme with 4 repetitions. The material was ensiled using PVC silos (10 cm diameter by 45 cm long) that were kept closed for 60 d. Upon opening, dry matter (DM), ash content (AC), organic matter (OM), and pH were measured. The data were analyzed using a 2-way ANOVA followed by the Tukey test (α < 0.05). The silage of the genotype B012 had a higher (P < 0.05) DM (mean ± standard deviation = 29.3 ± 1.90) compared with the other genotypes (B017 = 27.3 ± 1.54 and B018 = 26.4 ± 1.32). We observed a linear negative effect (P < 0.05) of sugarcane on DM content, in which a reduction of 0.30% of DM was observed for each 10% increase in sugarcane inclusion. We observed an interaction effect (P < 0.05) between genotypes and sugarcane levels for OM and AC. There was no effect of sugarcane levels on OM and AC of the B012 genotype silage (P > 0.05). A quadratic positive effect of sugarcane levels was observed on OM of the silages of the genotypes B017 and B018 (P < 0.05), in which the lowest values were observed at 7.63% and 1.29% inclusion of sugarcane respectively. A quadratic negative effect was observed on AC of the same genotypes (P < 0.05), in which the highest values were observed at the same sugarcane level inclusion as for OM. The silage of the genotype B012 had a higher (P < 0.05) pH (4.26 ± 0.07) than the other genotypes (B017 = 4.14 ± 0.04 and B018 = 4.17 ± 0.06). The genotypes of biomass sorghum evaluated in our study responded satisfactorily to the fermentation process, which could result in silages of good quality, but the inclusion of sugarcane is not recommended.

Keywords: alternative feed, 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.