Agnieszka Nowak

Poznań University of Life Sciences, Posen, Greater Poland Voivodeship, Poland

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Publications (3)2.24 Total impact

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    ABSTRACT: This study examined the potential effects of Saponaria officinalis (SO) or Panax ginseng (PG) saponins supplemented to diets differing in the proportion of forage to concentrate on rumen microbial fermentation and methane production in vitro. Two experiments were carried out using the rumen simulation technique (RUSITEC). In the first experiment the substrate was comprised of a mixture of meadow hay and corn meal in a ratio of 60:40 dry matter (DM; high forage diet; HF). In the second experiment low forage diet (LF) consisting of meadow hay and corn meal in the ratio of 40:60 DM was used. Diets were supplemented with dried roots of SO or PG to provide 1% of triterpenoid saponins in dietary dry matter. All triterpenoid sources significantly (P≤0.05) decreased number of protozoa, by 50% and 72% respectively when HF diet was analysed (first experiment). There were no changes in methane production. In the second experiment (LF), the potential to mitigate methane production was reported for both SO and PG addition, however only in PG a decrease in the protozoal population was detected. Supplementation of plants rich in triterpenoid saponins has been identified as a diet dependent potential factor which has an important role in modulation of rumen fermentation processes. However, further studies are needed to evaluate their effect in animal production.
    Annals of Animal Science 10/2013; 13(4):815-827. DOI:10.2478/aoas-2013-0055 · 0.61 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate the effect of Mentha piperita L. (MP) dried leaves on the in vitro rumen methanogenesis and fermentation. It was found that after 24 hours of incubations, addition of 16.34 and 23.35 mg of MP to the 233.3 mg of substrate significantly decreased methane emission by 41.52 and 15.51%, respectively. Simultaneously, the MP supplementation exerted no effect on the dry matter digestibility and volatile fatty acid profile. Addition of MP to the ruminants' diet inhibits the methane production without altering the basic parameters of rumen fermentation.
    Acta Agriculturae Scandinavica, Section A – Animal Science 09/2012; 62(1):46-52. DOI:10.1080/09064702.2012.703228 · 0.63 Impact Factor
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    ABSTRACT: There is a great interest in reducing the methane emission from ruminants as one possible cause of global warming. The aim of the presented study was to determine the effects of xanthohumol, one of the hop (Humulus lupulus) phytofactors, on methane production, microbial population and basic parameters of ruminal fermentation. The experiment was carried out in a batch culture system. The basic substrate (400 mg) consisting of meadow hay and barley meal (60:40) was supplemented with 0 (Control), 0.1, 0.2 or 1.0 mg of xanthohumol. The basic parameters of rumen fermentation and composition of microbial population were measured after 24 h of incubation. For the first time, the results of this in vitro study have demonstrated that xanthohumol is capable to reduce the methane production, even at the lowest dose applied (0.1 mg/400 mg). The observed reduction in methane production by 12-13% was not accompanied by altering the basic rumen fermentation parameters. However, the practical utility of this supplement needs further investigation under long-term in vivo conditions.
    Archives of animal nutrition 02/2012; 66(1):66-71. DOI:10.1080/1745039X.2011.644917 · 1.00 Impact Factor

Publication Stats

14 Citations
2.24 Total Impact Points


  • 2012-2013
    • Poznań University of Life Sciences
      • Department of Animal Nutrition and Feed Management
      Posen, Greater Poland Voivodeship, Poland