Tylosin Standard (98%)

Background Porcine infectious pleuropneumonia caused by Actinobacillus pleuropneumoniae (App) is one of the most serious infectious diseases in pigs and has brought huge economic losses to the world pig industry. The aim of this trial was to evaluate the effect of enteric-coated tilmicosin granule in the treatment and control of artificial infection of App. Methods Sixty Duroc and Yorkshire crossbred pigs (50 of which were artificially infected) were divided into six groups: BCG (Blank control group), ICG (Infection-only control group), HDG (High-dose enteric-coated tilmicosin granules), MDG (Medium-dose enteric-coated tilmicosin granules), LDG (Low-dose enteric-coated tilmicosin granules) and TPG (Tilmicosin premix drug control group). The cure rate, mortality, clinical respiratory score, body temperature score, weight gain, lung score and so on were recorded. Results The cure rate of HDG and MDG was as high as 90%, the mortality was 10%, and the clinical signs recovered quickly. Conclusion The results showed that enteric-coated tilmicosin granules had obvious therapeutic effect on artificial infection, which could reduce the damage caused by the disease and reduce the mortality.

In order to be more practical on evaluating the response of soil microbial communities to Cu contamination, we compared the microbial activity and selection for the microbial tolerance after a high level Cu exposure in single and corresponding repeated addition. It was shown that the activities of microorganisms in soils were largely inhibited by the exposure of Cu in a level of 32.9 mmol/kg, Specifically, single application displayed larger toxicity and longer-term effects on the microbial activity than the same amount of Cu that were repeatedly added by several times. Moreover, microbial tolerances to Cu and tylosin were observed in the soils contaminated by Cu. The repeated addition of Cu caused a higher tolerance to tylosin than that in a single addition, suggesting the repeated exposure has mitigated the toxicity and promote the selection for tolerant bacteria. Finally, it was observed that the organic pollutant (e.g. sulfadiazine) was degraded in the soils in an increasing order of sterilization< single-Cu addition < repeated-Cu addition < control, which was in agreement of microbial activities and emphasized the influence of Cu exposure on the soil function. (C) 2016 Elsevier B.V. All rights reserved.