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Evaluation of dietary addition of 2 essential oils from Achillea moschata,or their components (bornyl acetate,camphor,and eucalyptol) on in vitro ruminal fermentation and microbial community composition

引用

Animal Nutrition 2021年第1期7卷 224-231页

作者： Stefania Colombini andrea rota graziosi Pietro Parma Marcello Iriti Sara Vitalini Chiara Sarnataro Mauro Spanghero Dipartimento di Scienze Agrarie e Ambientali—Produzione TerritorioAgroenergiaUniversitàDegli Studi di MilanoVia Celoria 220133 MilanoItaly Dipartimento di Scienze Agroalimentari Ambientali e AnimaliUniversitàDegli Studi di Udine33100 UdineItaly

This study investigated the effects of 2 Achillea moschata essential oils extracted from plants collected in 2 different valleys of the Italian Alps and 3 pure compounds of oils—bornyl acetate(BOR),camphor(CAM),and eucalyptol(EUCA)—on in vitro ruminal fermentation and *** in vitro batch fermentation experiment(Exp.1)tested the addition of all of the substances(2 essential oils and 3 compounds)in fermentation bottles(120 mL)at 48 h of incubation,whereas a subsequent in vitro continuous culture experiment(Exp.2)evaluated the pure compounds added to the fermenters(2 L)for a longer incubation period(9 d).In both experiments,total mixed rations were incubated with the additives,and samples without additives were included as the control(CTR).Each treatment was tested in duplicate and was repeated in 3 and 2 fermentation runs in Exp.1 and 2,*** production(GP)in Exp.1 was similar for all of the treatments,and short chain volatile fatty acid(SCFA)production was similar in both experiments except for a decrease of SCFA produced(P=0.029)due to EUCA addition in *** to CTR,BOR and CAM reduced the valerate proportion(P=0.04)in Exp.1,and increased(P<0.01)the acetate proportion in *** treatments increased(P<0.01)total protozoa counts(+36.7%and+48.4%compared to CTR on average for Exp.1 and 2,respectively).In Exp.1,all of the treatments lowered the Bacteroidetes and Firmicutes and increased the Proteobacteria relative abundances(P<0.05),whereas in Exp.2,the EUCA addition increased(P=0.012)the *** Exp.1,methane(CH4)as a proportion of the GP was lowered(P=0.004)by the addition of CAM and EUCA compared to CTR,whereas in Exp.2,EUCA reduced the amount of stoichiometrically calculated CH4 compared to ***,essential oils extracted from *** and the pure compounds did not depress in vitro rumen fermentation,except for EUCA in *** both experiments,an increase of the protozoal population occurred for all the additives.

关键词： Methane Rumen fermentation Achillea moschata Protozoa Microbiome

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