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Articles by P. Williams
Total Records ( 3 ) for P. Williams
  M.D. Sims , B. Zweifel , P. Williams and D.M. Hooge
  Background and Objectives: Agolin® Poultry is an encapsulated blend of essential oil compounds. A 42 day trial was conducted with 1,800 broiler chicks using 3 dietary treatments and 20 pens/treatment (30 chicks/pen) to evaluate live performance. Methodology: Chicks received live coccidia vaccine at placement (day 0). Pelleted basal diets (CON) or diets with Agolin® Poultry (200 mg kg1, 0-14 days and 100 mg kg1 14-42 days) or BMD® (55 mg kg1, 0-28 days) and Stafac® (22 mg kg1, 28-42 days) were fed. Litter was new wood shavings initially and used litter was added on day 4 to provide Eimeria and bacterial pathogens. Daily light: dark cycle was 16:8 h. Litter was sampled at 14, 28 and 42 days for moisture and ammonia (by analyzing for nitrogen, then calculating theoretical ammonia). Oocysts per gram (OPG) feces were counted and foot pad lesion severity scores (0-2) were taken at 42 days. Results: The 28 and 35-day body weights were heavier on Agolin® or antibiotic diets than CON diets. Weight gain from 14-28 or 14-35 days was greater on Agolin® diets than CON with antibiotic diets intermediate. The 0-35 days mortality-adjusted feed conversion ratios (MAFCR) were lower on Agolin® or antibiotic diets than CON diets. Mortality (2.46-3.18%) was unaffected by treatment. Mortality percentage was unaffected by treatment. Litter moisture, OPG in feces and foot pad lesion scores were not different but 28 day litter ammonia tended to be lower on Agolin® diets. Conclusion: The 35-day BW and 0-35 day MAFCR were significantly improved by Agolin® or antibiotic diets compared to CON diets.
  M. H. Karavolos , D. M. Bulmer , K. Winzer , M. Wilson , P. Mastroeni , P. Williams and C. M. A. Khan
  LuxS catalyzes the synthesis of the quorum-sensing signaling molecule autoinducer 2. We show that in Salmonella enterica serovar Typhimurium, deletion of the luxS gene polarizes flagellar phase variation toward the more immunogenic phase 1 flagellin. This phenotype is complementable by luxS in trans but is independent of quorum-sensing signals.
  G. Hassan Mir , L.S. Devi , S. Ahmad , V. Manoj Kumar and P. Williams
  Investigation was undertaken to screen the potential native isolate of Trichoderma viride for bio suppression of corm rot pathogen complex, as Trichoderma viride are the most successful and widely used biocontrol agents. Taking the advantage and constraints of Trichoderma viride into consideration, efforts were made to encourage the native isolate against corm rot pathogens. Nine isolates of Trichoderma viride namely TK1, TK3, TK4, TK6, TK8, TK9, TK10, TK11 and TK15 were isolated from soils of different orchard plantations of Kashmir valley on modified Trichoderma Specific Medium (TSM). The isolates were studied for their cultural, morphometric characters and antagonistic potential against six newly recorded major fungal pathogens of saffron viz. sterile Basidiomycetes fungus, Rhizoctonia solani, Phytophthora sp., Fusarium oxysporum f. sp. gladioli, F. oxysporum and F. solani individually on Potato Dextrose Agar, the culture morphology of all the isolates was found to be similar. The isolate TK1, TK3, TK4, TK8, TK9, TK11 and TK15, were found fully overgrown on all corm rot Pathogens of saffron, where as the isolates TK13 failed to inhibit the Phytophthora sp. Efforts are onto evaluate the performance of promising isolate in field by soil and seed application methods.
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