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Environmental samples and samples of partially processed fish from a cold-smoked salmon processing and packing plant, and product samples purchased from retail outlets, were examined for the presence of Listeria monocytogenes and other Listeria spp., motile aeromonads and Yersinia enterocolitica. Listeria spp. were not isolated from rati fish but were a contaminant of processed and partially processed fish. Listeria spp. were also detected in 18.8% of surfaces in contact with fish. Unlike Listeria spp., motile aeromonads were isolated from the raw fish but not from the finished product. They were more frequently isolated from environmental sources than Listeria spp. Yersinia enterocolitica was not isolated from any of the samples tested. Little evidence was found to show a coincidence of motile aeromonads and Listeria spp., since only one subset of samples showed such a link. It is concluded that contamination by Listeria spp. was from environmental sources at the processing plant at, or beyond, the slicing stage. Reducing the number of wet areas and special cleaning and sanitation considerations for a contaminated site (the freezer seal) are suggested as ways of reducing contamination of the product. 相似文献
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饲料中钴的含量,直接影响到动物生产性能,尤其是反刍动物。钴参与消化、造血、繁殖、免疫等一系列生理活动。引起了人们的重视。本文综述钴的几种检测方法。1 原子吸收分光光度法该法是利用被测物质的基态原子,能吸收特定波长光的特点,进行定量检测的方法。11 火焰原子吸收光谱法测定钴(国标ＧＢ/Ｔ13884-92) 本标准适用于饲料原料、配合饲料、浓缩饲料和预混料中钴的测定。先用干灰化法处理饲料原料、配合饲料、浓缩饲料样品,在酸性条件下溶解残渣定容制成试样溶液;预混料用酸浸提法处理样品,定容制成试样溶液。将试样溶液导入原子吸收… 相似文献
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选择体重相近、体质外貌相似、生产性能相近、健康的杜泊羊42只,采用单因素对比试验方法,研究在日粮中添加5%～15%高硒或高硒钴苜蓿青干草对杜泊羊生长和生产性能的调控.结果表明,在杜泊羊的日粮中添加高硒或高硒钴苜蓿青干草可以显著地增加杜泊羊的体长、胸围,提高杜泊羊的日增重,促进饲料的转化与利用.其中,添加高硒苜蓿青干草的增重效果好于高硒钴苜蓿青干草,在日粮中添加15%的高硒苜蓿青干草时,杜泊羊增重和饲料转化效率均达到极显著高的水平(P＜0.01),日增重(0.22 kg/d)比对照提高了37.5%,料肉比(4.06)最低,比对照降低了21.9%. 相似文献
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E.D. Andrews M.Sc. A.N.Z.I.C. B.J. Stephenson C.E. Isaacs B.V.Sc. R.H. Register 《New Zealand veterinary journal》2013,61(11):191-196
Extract A large number of related compounds, all based on the prototype parent compound thiabendazole are now available on the market, each one claiming distinct advantages and applications for anti-parasitic use. The ever increasing number of benzimidazoles appearing regularly is a good example of so called molecular manipulation of molecular roulette whereby individual pharmaceutical companies endeavour to compete with a rival company's successful product without breaching the patent rights of a particular compound. 相似文献
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E E Edwin 《The Veterinary record》1977,101(19):393-394
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The comparative efficacy of 13 of the sheep dips currently registered in New Zealand was investigated using sheep infested with the louse Bovicola ovis and carrying wool which was about 10 cm long at the shoulder. With the exception of one synthetic pyrethroid “pour-on” formulation, all products were able to effect a significant reduction in louse populations, relative to untreated controls, for 37 days after treatment. Only four products proved capable of “eradicating” lice and preventing their re-establishment up to 37 days after treatment. Variations in manufacturers' recommendations relating to the length of wool at dipping, and mode of application of dips are discussed in relation to the results. 相似文献
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E.D. Andrews M.Sc. A.N.Z.I.C. C.E. Isaacs B.V.Sc. R.J. Findlay 《New Zealand veterinary journal》2013,61(5):140-146
Abstract Extract In New Zealand, cobalt-containing drenches are recommended for the field diagnosis of cobalt deficiency, but find little use as a routine method of controlling the disease. For the latter purpose, cobaltized licks have a place on extensively-grazed untopdressed hill country. Otherwise, topdressing pastures annually with cobalt sulphate, usually as cobaltized superphosphate, has proved the best method of prevention (N.Z. Dept. Agric, 1954; Andrews, 1956). In Australia, however, greater reliance has been placed on drenches and licks, partly because cobalt topdressing is regarded as uneconomic on the extensive undeveloped holdings usually associated with cobalt deficiency in that country, and partly because the effects of cobalt applied to the land have often proved ephemeral, particularly on the acutely-deficient calcareous coastal sands (Lee, 1950; Bennetts, 1955). However, recent work in South Australia opens up an entirely new approach to the control of cobalt deficiency disease. Dewey et al. (1958) report that when semi-porous pellets containing cobaltic oxide are administered to sheep they are retained in the reticulum, or less commonly in the rumen, and release a continuous and adequate supply of cobalt to the animal. Phalaris staggers and cobalt deficiency disease can be prevented in this way. 相似文献
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D E Corrier H H Mollenhauer D E Clark M F Hare M H Elissalde 《Veterinary pathology》1985,22(6):610-616
Dietary cobalt (265 ppm Co) induced polycythemia and consistent degenerative and necrotic lesions in the seminiferous tubules of rats. Cyanosis and engorgement of testicular vasculature on day 35 and thereafter was followed on day 70 by degenerative and necrotic changes in the germinal epithelium and Sertoli cells. Spermatogonia, primary spermatocytes and round spermatids were markedly affected, while elongated spermatids, spermatozoa, and sertoli cells were more resistant. Damaged tubules, often present side by side with normal tubules, contained multinucleated giant cells composed of degenerated and necrotic spermatocytes and/or spermatids, sloughed germinal and Sertoli cells, and calcified necrotic debris. Necrotic tubules were frequently collapsed and devoid of epithelium except for occasional spermatogonia and surviving Sertoli cells. Lesions were not observed in the Leydig cells, cauda epididymis or seminal vesicles. 相似文献
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微量元素钴在动物营养上的研究与应用 总被引：1，自引：0，他引：1
<正>钴(Co)是维生素B12和一些酶(如核糖核酸酶等)的组成成分,主要通过维生素B12参与机体造血和营养物质的消化、代谢(蛋白质、脂肪和碳水化合物)等过程,促进动物的生长。 相似文献