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排序方式： 共有73条查询结果，搜索用时 15 毫秒
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Landscape metrics with ecotones: pattern under uncertainty 总被引：1，自引：0，他引：1
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Effect of dietary components on the gut microbiota of aquatic animals. A never‐ending story? 
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下载免费PDF全文 E. Ringø Z. Zhou J.L.G. Vecino S. Wadsworth J. Romero Å. Krogdahl R.E. Olsen A. Dimitroglou A. Foey S. Davies M. Owen H.L. Lauzon L.L. Martinsen P. De Schryver P. Bossier S. Sperstad D.L. Merrifield 《Aquaculture Nutrition》2016,22(2):219-282
It is well known that healthy gut microbiota is essential to promote host health and well‐being. The intestinal microbiota of endothermic animals as well as fish are classified as autochthonous or indigenous, when they are able to colonize the host's epithelial surface or are associated with the microvilli, or as allochthonous or transient (associated with digesta or are present in the lumen). Furthermore, the gut microbiota of aquatic animals is more fluidic than that of terrestrial vertebrates and is highly sensitive to dietary changes. In fish, it is demonstrated that [a] dietary form (live feeds or pelleted diets), [b] dietary lipid (lipid levels, lipid sources and polyunsaturated fatty acids), [c] protein sources (soybean meal, krill meal and other meal products), [d] functional glycomic ingredients (chitin and cellulose), [e] nutraceuticals (probiotics, prebiotics, synbiotics and immunostimulants), [f] antibiotics, [g] dietary iron and [h] chromic oxide affect the gut microbiota. Furthermore, some information is available on bacterial colonization of the gut enterocyte surface as a result of dietary manipulation which indicates that changes in indigenous microbial populations may have repercussion on secondary host–microbe interactions. The effect of dietary components on the gut microbiota is important to investigate, as the gastrointestinal tract has been suggested as one of the major routes of infection in fish. Possible interactions between dietary components and the protective microbiota colonizing the digestive tract are discussed. 相似文献
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Johnson B Gorman NT Hird JF Wadsworth DE Wells JA Dyson SJ Bleby J 《The Veterinary record》2002,151(8):247; author reply 247
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Jonathan Wadsworth 《Agricultural Systems》1985,16(2):85-107
The economic effect of increased stocking rate permitted by the introduction of dry season feedin is evaluated with reference to the growing/fatening system of beef production in the sub-humid tropics. A widely applicable model is derived which requires few input variables, all of which will be easily obtainable in a specific location. The economic break-even point in terms of feeding cost and dry season length can be determined in order to assess the value of local diets or attempt the formulation of new ones. Increae in profitability due to dry season feeding is assessed taking into account increase in stocking rate, seasonal de-stocking practices, length of dry season, growth rates, feed costs and beef price. The model is appropriate for use in developing countries and can be employed manually to determine rapidly those management options worthy of more detailed consideration. 相似文献
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