1. bookAHEAD OF PRINT
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eISSN
2300-8733
Prima pubblicazione
25 Nov 2011
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4 volte all'anno
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access type Accesso libero

Fibrolytic enzymes increases fermentation losses and reduces fiber content of sorghum silage

Pubblicato online: 16 May 2022
Volume & Edizione: AHEAD OF PRINT
Pagine: -
Ricevuto: 06 Apr 2021
Accettato: 29 Apr 2022
Dettagli della rivista
License
Formato
Rivista
eISSN
2300-8733
Prima pubblicazione
25 Nov 2011
Frequenza di pubblicazione
4 volte all'anno
Lingue
Inglese
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 of 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 neither 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, it increases fermentative losses and has no positive effect on in vitro degradation and in the time of aerobic stability.

Keywords

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