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11.
Kyriakis SC Bourtzi-Hatzopoulou E Alexopoulos C Kritas SK Polyzopoulou Z Lekkas S Gardey L 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2002,49(7):317-321
The aim of this trial was to evaluate the effect of in-feed doxycycline (DOXY) on the control of ileitis in weaned piglets. On a farm with a previous history of ileitis outbreaks, 288 piglets at the age of weaning (25 +/- 2 days old) were divided into four experimental groups, each group comprising three pens with 24 piglets in each pen. Non-medicated animals served as negative control (NC) group, whereas groups DOXY-50, DOXY-125 and DOXY-250 received doxycycline via feed at 50, 125 and 250 ppm, respectively. Therapy lasted for 14 days followed by an observation period of 28 days. In conclusion, administration of doxycycline at a dose rate of 125 or 250 ppm had beneficial effect compared with the NC group. in terms of the reduction of diarrhoea prevalence, the enhancement of growth performance and the reduction of prevalence of Lawsonia intracellularis in the intestine, as shown either by the PCR method or by specific histopathological examinations. Treatment with 250 ppm of doxycycline for a fortnight interval post-weaning seems to be beneficial leading to better growth rates of piglets not only during treatment period, but also throughout the whole nursery phase. 相似文献
12.
Michalis Pavlidis Maria Karkana Eleftheria Fanouraki & Nikos Papandroulakis 《Aquaculture Research》2008,39(8):837-849
Fish display sophisticated skin chromatic properties that are of considerable ecological, physiological and behavioural importance. The aim of study was to investigate the role of important physical parameters (background colour, lighting spectrum, light intensity and water temperature) on skin colour to gain better knowledge of the environmental factors that regulate pigmentation in cultured red porgy, Pagrus pagrus . All tested physical parameters had a significant effect on skin lightness, especially in the dorsal body area; low light intensity, blue spectrum, a water temperature of 19 °C and a white background significantly increased skin lightness. This effect was mediated through changes in melanophore motility and/or skin melanin concentration. None of the examined factors affected skin hue while a significant decrease in skin entire colour index (a combination of hue and chroma) was found only in white background-adapted fish. It is concluded that all tested physical factors are important regulators of skin lightness. 相似文献
13.
Komnenou A Eberhard ML Kaldrymidou E Tsalie E Dessiris A 《Veterinary ophthalmology》2002,5(2):119-126
In the present study, we describe a series of 23 cases of ocular subconjunctival parasitic granulomas in dogs, admitted to the Clinic of Surgery, Faculty of Veterinary Medicine of the Aristotle University of Thessaloniki, Greece, between 1997 and 2000. The ophthalmic manifestations in all animals were periorbital swelling, discomfort, photophobia, conjunctival congestion, and discharge. A more detailed examination revealed the presence of periocular masses (nodules) on the subconjunctival bulbar space. Granulomatous or cyst-like formations were extracted surgically, and were found to contain thread-like nematode parasites. A histologic and parasitologic examination of tissues and parasites was carried out. Diagnosis of parasitic granulomas was made and the parasite was identified as Onchocerca sp. This is the largest series of cases reported of aberrant Onchocerca infections in dogs coming from one geographic location. 相似文献
14.
Charilaos Giotis Emilia Markelou Afroditi Theodoropoulou Eleftheria Toufexi Robert Hodson Peter Shotton Robert Shiel Julia Cooper Carlo Leifert 《European journal of plant pathology / European Foundation for Plant Pathology》2009,123(4):387-400
The effect of different soil amendments and biological control agents on soil-borne root diseases that cause significant economic
losses in organic and other soil-based tomato production systems (Pyrenochaeta lycopersici and Verticillium albo-atrum) was compared. Organic matter inputs (fresh Brassica tissue, household waste compost and composted cow manure) significantly reduced soil-borne disease severity (measured as
increased root fresh weight) and/or increased tomato fruit yield, with some treatments also increasing fruit number and/or
size. Soil biological activity also increased with increasing organic matter input levels and there were significant positive
correlations between soil biological activity, root fresh weight and fruit yield. This indicates that one mechanism of soil-borne
disease control by organic matter input may be increased competition by the soil biota. Chitin/chitosan products also significantly
reduced soil-borne disease incidence and increased tomato fruit yield, number and/or size, but had no effect on soil biological
activity. Biological control products based on Bacillus subtilis and Pythium oligandrum and commercial seaweed extract (Marinure) and fish emulsion (Nugro)-based liquid fertilisers had no positive effect on soil-borne
disease incidence and fruit yield, number and size. The use of ‘suppressive’ organic matter inputs alone or in combination
with chitin/chitosan soil amendments can therefore be recommended as methods to control soil-borne diseases in organic and
other soil-based production systems. 相似文献
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