Effects of tannins and drying methods on in vitro dry matter and crudeprotein degradability and digestibility in rapeseed meal

Valcl, Nejc (avtor), Lavrenčič, Andrej (avtor)

The extensive ruminal degradability of rapeseed meal limits its efficiency as a protein source in ruminant diets by reducing the proportion of dietary protein available for post-ruminal absorption. This study, conducted entirely in vitro, investigated the interactive effects of two tannin types: chestnut water extract (CWE) and quebracho extract (QUE), two tannin inclusion levels (50 or 100 g/kg), and three drying methods (freeze-drying, oven drying at 50 °C or 80 °C) on the in vitro dry matter and crude protein degradability and digestibility of rapeseed meal. In vitro assessments were conducted using rumen fluid from cannulated rams and a three-step enzymatic procedure. A three-way linear model including tannin type, concentration, drying method and their interactions was used. In vitro crude protein degradability decreased by 128 and 243 g/kg dry matter when 50 and 100 g chestnut/kg were included and dried at 50 °C, respectively. By-pass protein content increased by 105 and 219 g/kg dry matter with included 50 g CWE/kg and 100 g QUE/kg dried at 50 °C, respectively. Notably, the combination of 100 g CWE/kg and 80 °C drying significantly reduced in vitro crude protein digestibility by 50 g/kg dry matter. At 80 °C drying, in vitro dry matter degradability reduced the most, by 237 and 366 g/kg dry matter at added 100 g QUE and CWE/kg, respectively. Overall, the application of tannins with drying at 50 °C or 80 °C can improve the amount of by-pass protein in rapeseed meal. These findings indicate a potential for novel tannin-processing strategies of rapeseed meal in ruminant nutrition.

• Jezik: Angleški jezik
• Ključne besede: rapeseed meal, in vitro, protein, ruminants, tannins
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: Str. 1111–1122
• Številčenje: Vol. 25, issue 1
• PID: 20.500.12556/RUL-186184
• UDK: 636.084/.087
• ISSN pri članku: 1828-051X
• DOI: 10.1080/1828051X.2026.2720270
• COBISS.SI-ID: 289204227
• Datum objave v RUL: 28.08.2026

Gradivo je del revije

• Naslov: Italian Journal of Animal Science
• Skrajšan naslov: Ital. J. Anim. Sci.
• Založnik: Edizioni Avenue media
• ISSN: 1828-051X
• COBISS.SI-ID: 522319385

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: prehrana živali, prežvekovalci, surove beljakovine, suha snov, tanini, sušenje, in vitro, razgradljivost, prebavljivost, ogrščične tropine

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P4-0097
• Naslov: Prehrana in mikrobna ekologija prebavil