Search

Probiotics are a kind of living microorganisms, and taking probiotics in moderation is beneficial to the health of the host. Probiotics have the functions of antitoxin, anti-pathogenic bacteria, and diarrhea reduction, which can improve the balance of intestinal flora, promote the digestion and absorption of nutrients, and improve host immunity. Adding probiotics to livestock and poultry diets can supplement intestinal microbial population, improve animal production performance, and restore the immune system function of the host. In this paper, the screening criteria, action mechanism, and application progress of probiotics in intestinal health of livestock and poultry were summarized, and the effects of probiotics on intestinal structure, immune function, and production performance were discussed, which provided a reference for the application of probiotics in livestock and poultry production. [ABSTRACT FROM AUTHOR]

Copyright of Feed Research is the property of Editorial Board of Feed Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The experiment was to investigate the feasibility of producing trifolium flavone from Cymbidium trifolium cell suspension culture. The callus was induced by leaves and stems of wild Cymbidium trifolium as explants, and the proliferation, single cell culture and total flavonoid content were measured. The suspension cultured cells were cultured with different liquid medium formulations, light mode, shaking table speed, inoculum amount, pH value and culture days. The total flavonoids were extracted by reflux with ethanol as solvent, and NaNO2-Al(NO3)3 was used for color development. Total flavonoid content was determined by UV spectrophotometer at 500 nm. The results show that the optimal medium for Cymbidium trifolium was MS + 1.5 mg/L 6-BA + 2.5 mg/L 2-4D + 3 mg/L NAA + 0.4 mg/L 6-KT, 8 h/d illumination, shaking speed 110 r/min, inoculation dosage 25 mL/L, pH value 5.8, incubation time was 13 d. The results show that flavonoids could be produced by Cymbidium trifolium cell culture, and the accumulation of flavonoids in the suspension culture system of Cymbidium trifolium cell could reach 20.524 mg/g under optimal culture conditions. [ABSTRACT FROM AUTHOR]

Copyright of Feed Research is the property of Editorial Board of Feed Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the study, a highly and efficient extraction technique for determination of flavonoids from guava leaves using a combination of ultrasound-assisted extraction and deep eutectic solvents (DES) was developed. Using guava leaves as raw materials and deep eutectic solvents as solvent, response surface experiments were designed based on BoxBehnken principle. The effect of deep eutectic solvents composition, the ratio of moles of hydrogen bond acceptor and donor, liquid-solid ratio and extraction time on extraction yield of total flavonoids from guava leaves were analyzed, and the extraction parameters were optimized. The results showed that deep eutectic solvents choline chloride/ethylene glycol was better than other solvents. The ratio of moles 1∶15, extraction time 45 min and liquid-solid ratio 17 mL/g were the best extraction parameters. The extraction yield of total flavonoids was 21.01%, RSD was 1.1%, 0.98% different from the predicted value of regression model. The study indicates that the deep eutectic solvents of choline chloride/ethylene glycol system can be used for the extraction of total flavonoids from guava leaves, and the extraction effect is good with the optimization of forward response surface. [ABSTRACT FROM AUTHOR]

Copyright of Feed Research is the property of Editorial Board of Feed Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The study used the transparent circle method to screen a high-temperature-tolerant xylanase-producing strain TP-1. It was identified as Thermomyces dupontii through the observation of colony characteristics, microscope observation and ITS sequence analysis. The result showed that the optimal temperature of the xylanase produced by Thermomyces dupontii TP-1 was 60 ℃, the optimal reaction pH value was 5, and the enzyme activity was 75.96 U/g under the optimal conditions. Incubate at pH value 4 and 60 ℃ for 2 h, the enzyme can still maintain high activity. The experiment indicates that Fe2+, Ba2+, and Mn2+ can significantly improve the enzyme activity of xylanase, and Co2+ can reduce the enzyme activity. The enzyme has good application prospects in feed processingindustry. [ABSTRACT FROM AUTHOR]