This study was carried out to unravel the mechanism of reductions in production performances in high stocking density geese flocks during summer months in ＂geese-fish＂ production system. Experiment 1 observed the wa...This study was carried out to unravel the mechanism of reductions in production performances in high stocking density geese flocks during summer months in ＂geese-fish＂ production system. Experiment 1 observed the water bacterial growth, lipopolysaccharde concentrations in water and geese blood, and geese reproductive performances from summer to winter, in two flocks with varying on water stocking densities. Results showed that counts of total bacteria, Escherichia coli and Salmonella in water, as well as water and geese plasma LPS concentrations, exhibited a tendency decreasing from the highest levels in summer, to intermediate levels in autumn, and to the lowest values in winter. Such seasonal decreases in bacteria and LPS concentrations were associated with similar seasonal decreases in embryo mortality during incubation. In addition, embryos dead or showing development retardation by day 25 of incubation contained copious LPS in allantoic fluid, in contrast to the negligible amount in normal developing embryos. Raising on water stocking density elevated bacteria counts, LPS concentrations in water and geese plasma, and decreased egg fertility but increased embryo mortality during incubation. In experiment 2, exogenous LPS treatment to the geese depressed egg laying, reduced egg hatchability, caused sickness behavior in the goslings hatched. In experiment 3, exogenous LPS directly administered to day 8 and 18 embryos during incubation dose dependently increased mortality and decreased hatchability, and caused sickness behavior in the goslings hatched. It is concluded that the raising on water geese stocking density stimulates pathogenic bacteria growth in water, which via LPS contamination impaires embryo development in incubation and therefore reduces geese reproductive performance and gosling quality during the hot summer months.展开更多
分析真姬菇新菌株"闽真3号"的营养成分、农艺性状和生产性能。结果为,子实体含热量117 k J/100g,总碳水化合物3.4%,膳食纤维2.06%,富含谷氨酸、亮氨酸、天冬氨酸等,营养价值高,质硬而脆,品质好;菌盖呈灰褐色,菌盖直径与菌柄...分析真姬菇新菌株"闽真3号"的营养成分、农艺性状和生产性能。结果为,子实体含热量117 k J/100g,总碳水化合物3.4%,膳食纤维2.06%,富含谷氨酸、亮氨酸、天冬氨酸等,营养价值高,质硬而脆,品质好;菌盖呈灰褐色,菌盖直径与菌柄长度均匀,有效菇蕾数较对照白玉菇007多,整齐度好,出菇时间比对照缩短15~20天;多年生产示范表现丰产、稳产,商品性状优于对照,平均每袋产量450 g,成品率高达90%,较对照提高15%。展开更多
基金supported by the National Natural Science Foundation of China (30871795)the Earmarked Fund for Modern Agro-Industry Technology Research System, China (nycytx-45-13)
文摘This study was carried out to unravel the mechanism of reductions in production performances in high stocking density geese flocks during summer months in ＂geese-fish＂ production system. Experiment 1 observed the water bacterial growth, lipopolysaccharde concentrations in water and geese blood, and geese reproductive performances from summer to winter, in two flocks with varying on water stocking densities. Results showed that counts of total bacteria, Escherichia coli and Salmonella in water, as well as water and geese plasma LPS concentrations, exhibited a tendency decreasing from the highest levels in summer, to intermediate levels in autumn, and to the lowest values in winter. Such seasonal decreases in bacteria and LPS concentrations were associated with similar seasonal decreases in embryo mortality during incubation. In addition, embryos dead or showing development retardation by day 25 of incubation contained copious LPS in allantoic fluid, in contrast to the negligible amount in normal developing embryos. Raising on water stocking density elevated bacteria counts, LPS concentrations in water and geese plasma, and decreased egg fertility but increased embryo mortality during incubation. In experiment 2, exogenous LPS treatment to the geese depressed egg laying, reduced egg hatchability, caused sickness behavior in the goslings hatched. In experiment 3, exogenous LPS directly administered to day 8 and 18 embryos during incubation dose dependently increased mortality and decreased hatchability, and caused sickness behavior in the goslings hatched. It is concluded that the raising on water geese stocking density stimulates pathogenic bacteria growth in water, which via LPS contamination impaires embryo development in incubation and therefore reduces geese reproductive performance and gosling quality during the hot summer months.
文摘分析真姬菇新菌株"闽真3号"的营养成分、农艺性状和生产性能。结果为,子实体含热量117 k J/100g,总碳水化合物3.4%,膳食纤维2.06%,富含谷氨酸、亮氨酸、天冬氨酸等,营养价值高,质硬而脆,品质好;菌盖呈灰褐色,菌盖直径与菌柄长度均匀,有效菇蕾数较对照白玉菇007多,整齐度好,出菇时间比对照缩短15~20天;多年生产示范表现丰产、稳产,商品性状优于对照,平均每袋产量450 g,成品率高达90%,较对照提高15%。
