http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
TASSEW, Dereje Damte,MECHESSO, Abraham Fikru,PARK, Na-Hye,SONG, Ju-Beom,SHUR, Joo-Woon,PARK, Seung-Chun The Japanese Society of Veterinary Science 2017 The Journal of veterinary medical science Vol.79 No.10
<P>The study was aimed to investigate biofilm forming ability of <I>Mycoplasma hyopneumoniae</I> and to determine the minimum biofilm eradication concentrations of antibiotics. Biofilm forming ability of six strains of <I>M. hyopneumoniae</I> was examined using crystal violet staining on coverslips. The results demonstrated an apparent line of biofilm growth in 3 of the strains isolated from swine with confirmed cases of enzootic pneumonia. BacLight bacterial viability assay revealed that the majority of the cells were viable after 336 hr of incubation. Moreover, <I>M. hyopneumoniae</I> persists in the biofilm after being exposed to 10 fold higher concentration of antibiotics than the minimum inhibitory concentrations in planktonic cells. To the best of our knowledge, this is the first report of biofilm formation in <I>M. hyopneumoniae.</I> However, comprehensive studies on the mechanisms of biofilm formation are needed to combat swine enzootic pneumonia caused by resistant <I>M. hyopneumoniae</I>.</P>
Laser methane detector-based quantification of methane emissions from indoor-fed Fogera dairy cows
Kobayashi, Nobuyuki,Hou, Fujiang,Tsunekawa, Atsushi,Yan, Tianhai,Tegegne, Firew,Tassew, Asaminew,Mekuriaw, Yeshambel,Mekuriaw, Shigdaf,Hunegnaw, Beyadglign,Mekonnen, Wondimeneh,Ichinohe, Toshiyoshi Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.8
Objective: Portable laser methane detectors (LMDs) may be an economical means of estimating CH<sub>4</sub> emissions from ruminants. We validated an LMD-based approach and then used that approach to evaluate CH<sub>4</sub> emissions from indigenous dairy cows in a dryland area of Ethiopia. Methods: First, we validated our LMD-based approach in Simmental crossbred beef cattle (n = 2) housed in respiration chambers and fed either a high- or low-concentrate diet. From the results of the validation, we constructed an estimation equation to determine CH<sub>4</sub> emissions from LMD CH<sub>4</sub> concentrations. Next, we used our validated LMD approach to examine CH<sub>4</sub> emissions in Fogera dairy cows grazed for 8 h/d (GG, n = 4), fed indoors on natural-grassland hay (CG1, n = 4), or fed indoors on Napier-grass (Pennisetum purpureum) hay (CG2, n = 4). All the cows were supplemented with concentrate feed. Results: The exhaled CH<sub>4</sub> concentrations measured by LMD were linearly correlated with the CH<sub>4</sub> emissions determined by infrared-absorption-based gas analyzer (r<sup>2</sup> = 0.55). The estimation equation used to determine CH<sub>4</sub> emissions (y, mg/min) from LMD CH<sub>4</sub> concentrations (x, ppm m) was y = 0.4259x+38.61. Daily CH<sub>4</sub> emissions of Fogera cows estimated by using the equation did not differ among the three groups; however, a numerically greater milk yield was obtained from the CG2 cows than from the GG cows, suggesting that Napier-grass hay might be better than natural-grassland hay for indoor feeding. The CG1 cows had higher CH<sub>4</sub> emissions per feed intake than the other groups, without significant increases in milk yield and body-weight gain, suggesting that natural-grassland hay cannot be recommended for indoor-fed cows. Conclusion: These findings demonstrate the potential of using LMDs to valuate feeding regimens rapidly and economically for dairy cows in areas under financial constraint, while taking CH<sub>4</sub> emissions into consideration.