Probiotic yeasts in livestock sector

Vohra, Ashima; Syal, Poonam; Madan, Anshu

doi:10.1016/j.anifeedsci.2016.05.019

Cited by 96 publications

(49 citation statements)

References 164 publications

(171 reference statements)

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“…Live yeast is generally characterized by a high concentration of active yeast cells with viability and metabolic activity. The main role of LY comprises alternating microbial activities and increasing microbial numbers in the rumen to promote rumen fermentation . LY potentially stabilized rumen pH by reducing lactic acid producers and stimulating lactic acid utilizers.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the greater NH 3 ‐N concentration with the addition of yeast products would not support increased microbial protein synthesis, although rumen proteolytic activity may be increased by yeast supplementation . Thus, an improvement in microbial digestion by the feed may be explained by an increased production of enzymes by probiotics or an alteration in rumen microbial ecology …”

Section: Discussionmentioning

confidence: 99%

“…The main role of LY comprises alternating microbial activities and increasing microbial numbers in the rumen to promote rumen fermentation. 28 LY potentially stabilized rumen pH by reducing lactic acid producers and stimulating lactic acid utilizers. In addition, LY stimulates the growth of anaerobic bacteria by scavenging oxygen within the rumen, which improves rumen fiber digestion and enhances rumen microbial protein production.…”

Section: Discussionmentioning

confidence: 99%

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Screening of live yeast and yeast derivatives for their impact of strain and dose on in vitro ruminal fermentation and microbial profiles with varying media pH levels in high‐forage beef cattle diet

et al. 2019

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BACKGROUND Yeast products showed beneficial effects with respect to stabilizing ruminal pH, stimulating ruminal fermentation and improving production efficiency. Batch cultures were conducted to evaluate the effects of yeast products on gas production (GP), dry matter disappearance (DMD) and fermentation characteristics of high‐forage substrate. The study was a two media pH (5.8 and 6.5) × five yeasts (three live yeasts, LY: LY1, LY2, LY3; two yeast derivatives, YD: YD4, YD5) × four dosages factorial arrangement, with monensin (Mon) assigned as a positive control. RESULTS Greater (P < 0.01) GP, DMD, volatile fatty acid (VFA) concentration, ratio of acetate to propionate (A:P) and copy numbers of Fibrobacter succinogenes and Ruminococcus flavefaciens were observed at pH 6.5 than at pH 5.8. The GP kinetics, DMD, VFA concentration, A:P and NH3‐N concentration differed (P < 0.05) among yeasts but varied with media pH or yeast dosages. Increasing doses of LY3 linearly increased DMD (P < 0.04) and VFA concentration (P < 0.001) at media pH 5.8. The DMD linearly (P < 0.02) increased with increased addition of YD4 (pH 6.5) and YD5 (pH 5.8) and the ratio of A:P linearly decreased (P < 0.01) with the addition of YD4 or YD5 at pH 5.8. Overall greater (P < 0.05) GP, A:P (pH 5.8) and DMD (pH 6.5) were observed with yeast products than with Mon. CONCLUSION LY3 appeared to be an interesting candidate for improving rumen digestibility and fermentation efficiency, particularly at low media pH. YD4 or YD5 improved fermentation efficiency and can be potentially fed as an alternative to Mon. © 2019 Her Majesty the Queen in Right of Canada Journal of the Science of Food and Agriculture © 2019 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Screening of live yeast and yeast derivatives for their impact of strain and dose on in vitro ruminal fermentation and microbial profiles with varying media pH levels in high‐forage beef cattle diet

et al. 2019

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“…Yeasts are considered undesirable; however, this term must be used with caution since some yeasts, mainly of the species Saccharomyces cerevisiae, are widely used as probiotics for ruminants, performing important rumen functions (Vohra et al 2016). Duni ere et al (2015) evaluated the inoculation of Sac.…”

Section: Yeastsmentioning

confidence: 99%

Silage fermentation—updates focusing on the performance of micro‐organisms

2019

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Summary Advances in micro‐organism identification techniques have resulted in increased knowledge of the diversity of prokaryotes and eukaryotes in silage. Such knowledge has enhanced the understanding of how fermentation occurs in forage crops with different characteristics and how the process can be improved to enhance silage quality. Undesirable micro‐organisms can grow in silage when fermentation does not occur properly. Such micro‐organisms may be pathogenic and/or produce toxic metabolic compounds; however, information on the consequences of these metabolites on the health of animals that consume silage is still lacking. The major challenge of ensilage is to produce high‐quality feed that is nutritional, sanitary and stable, with a high dry matter recovery rate, in a process involving no interventions during fermentation and considerable variation in the characteristics of the substrates. It is important to note that each substrate has particularities and that we can only improve fermentation if we fully understand microbial diversity. This review is intended to update information related to the fermentation profile of silage, focusing on microbial diversity.

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“…However, Y. lipolytica has safe status, and has been categorized as a GRAS microorganism by the FDA (Food and Drug Administration) [56,88]. This status, as well as its probiotic properties [117], can pave the way toward the biosynthesis of LCDCAs that meet the safety requirements of the food and pharmaceutical industries.…”

Section: Discussionmentioning

confidence: 99%

Combinatorial Engineering of Yarrowia lipolytica as a Promising Cell Biorefinery Platform for the de novo Production of Multi-Purpose Long Chain Dicarboxylic Acids

2017

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This proof-of-concept study establishes Yarrowia lipolytica (Y. lipolytica) as a whole cell factory for the de novo production of long chain dicarboxylic acid (LCDCA-16 and 18) using glycerol as the sole source of carbon. Modification of the fatty acid metabolism pathway enabled creating a pool of fatty acids in a β-oxidation deficient strain. We then selectively upregulated the native fatty acid ω-oxidation pathway for the enhanced terminal oxidation of the endogenous fatty acid precursors. Nitrogen-limiting conditions and leucine supplementation were employed to induce fatty acid biosynthesis in an engineered Leu -modified strain. Our genetic engineering strategy allowed a minimum production of 330 mg/L LCDCAs in shake flask. Scale up to a 1-L bioreactor increased the titer to 3.49 g/L. Our engineered yeast also produced citric acid as a major by-product at a titer of 39.2 g/L. These results provide basis for developing Y. lipolytica as a safe biorefinery platform for the sustainable production of high-value LCDCAs from non-oily feedstock.

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Probiotic yeasts in livestock sector

Cited by 96 publications

References 164 publications

Screening of live yeast and yeast derivatives for their impact of strain and dose on in vitro ruminal fermentation and microbial profiles with varying media pH levels in high‐forage beef cattle diet

Screening of live yeast and yeast derivatives for their impact of strain and dose on in vitro ruminal fermentation and microbial profiles with varying media pH levels in high‐forage beef cattle diet

Silage fermentation—updates focusing on the performance of micro‐organisms

Combinatorial Engineering of Yarrowia lipolytica as a Promising Cell Biorefinery Platform for the de novo Production of Multi-Purpose Long Chain Dicarboxylic Acids

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