<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Fiber digestibility is a key-point of forage usage in ruminant production systems. The present study aimed to evaluate the effect of fibrolytic enzyme blend on whole-plant sorghum silage fermentation profile, fermentative losses, chemical composition, <italic>in vitro</italic> degradation, and aerobic stability. It used fifty experimental silos (plastic bucket, 28 cm i.d. and 25 cm in height) in a blocked randomized design to evaluate the following fibrolytic enzyme levels: 0, 150, 300, 450, and 600 mL per ton of dry matter (DM). Enzymes had 300 U/mL of xylanase and 300 U/mL of cellulase. Enzymes linearly increased acetic acid, branched-chain organic acids, and ethanol concentration of silage. Although there was no treatment effect on silage DM recovery over the ensiling process, enzyme levels linearly increased gas, effluent, and total losses. Intermediary levels of enzymes (from 312 to 342 mL/ton DM) decreased fiber content (NDF and ADF), whereas improved NFC silage content. Besides, enzymes did not affect DM and NDF degradation and tended to linearly reduce acid detergent fiber <italic>in vitro</italic> degradation. The enzymes addition linearly decreased silage temperature after aerobic exposure. However, there was no treatment effect on silage pH after aerobic exposure also during the time that silage remained with a temperature lower than 2°C above environmental temperature. Thus, fibrolytic enzymes reduce fiber content, promote a heterolactic fermentation, and reduce silage temperature after aerobic exposure. However, this increases fermentative losses and has no positive effect on <italic>in vitro</italic> degradation and the time of aerobic stability.</p>
</abstract>

Fiber digestibility is a key-point of forage usage in ruminant production systems. The present study aimed to evaluate the effect of fibrolytic enzyme blend on whole-plant sorghum silage fermentation profile, fermentative losses, chemical composition, in vitro degradation, and aerobic stability. It used fifty experimental silos (plastic bucket, 28 cm i.d. and 25 cm in height) in a blocked randomized design to evaluate the following fibrolytic enzyme levels: 0, 150, 300, 450, and 600 mL per ton of dry matter (DM). Enzymes had 300 U/mL of xylanase and 300 U/mL of cellulase. Enzymes linearly increased acetic acid, branched-chain organic acids, and ethanol concentration of silage. Although there was no treatment effect on silage DM recovery over the ensiling process, enzyme levels linearly increased gas, effluent, and total losses. Intermediary levels of enzymes (from 312 to 342 mL/ton DM) decreased fiber content (NDF and ADF), whereas improved NFC silage content. Besides, enzymes did not affect DM and NDF degradation and tended to linearly reduce acid detergent fiber in vitro degradation. The enzymes addition linearly decreased silage temperature after aerobic exposure. However, there was no treatment effect on silage pH after aerobic exposure also during the time that silage remained with a temperature lower than 2°C above environmental temperature. Thus, fibrolytic enzymes reduce fiber content, promote a heterolactic fermentation, and reduce silage temperature after aerobic exposure. However, this increases fermentative losses and has no positive effect on in vitro degradation and the time of aerobic stability.

Fibrolytic Enzymes Increase Fermentation Losses and Reduce Fiber Content of Sorghum Silage

Department of Biotechnology, Vegetal and Animal Production, Center of Agricultural Sciences

Department of Animal Science, Faculty of Agricultural Sciences

Federal University of the South and Southeast of Pará

Rural Science Center, Federal University of Santa Maria

Annals of Animal Science

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fiber digestibility is a key-point of forage usage in ruminant production systems. The present study aimed to evaluate the effect of fibrolytic enzyme blend on...

Fibrolytic Enzymes Increase Fermentation Losses and Reduce Fiber Content of Sorghum Silage

Publié en ligne: 27 janv. 2023

Pages: 165 - 172

Reçu: 06 avr. 2021

Accepté: 29 avr. 2022

DOI: https://doi.org/10.2478/aoas-2022-0038

Mots clés
acetic acid, cellulase, fiber degradation, neutral detergent fiber, xylanase

© 2022 Mariana Campana et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fibrolytic Enzymes Increase Fermentation Losses and Reduce Fiber Content of Sorghum Silage

Publié en ligne: 27 janv. 2023

Pages: 165 - 172

Reçu: 06 avr. 2021

Accepté: 29 avr. 2022

DOI: https://doi.org/10.2478/aoas-2022-0038

Mots clésacetic acid, cellulase, fiber degradation, neutral detergent fiber, xylanase

© 2022 Mariana Campana et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Mots clés
acetic acid, cellulase, fiber degradation, neutral detergent fiber, xylanase