烧鸡风味复合辛香料精油、油树脂和超微粉的GC-MS对比分析

采用水蒸气蒸馏法、超临界CO2萃取法和低温冷冻粉碎法等不同加工方法制备烧鸡风味复合辛香料深加工产品精油、油树脂和超微粉,并对其进行了风味成分的GC-MS对比分析.试验结果表明:3种辛香料深加工产品的风味成分存在差异,α-蒎烯、β-松油烯、桉叶油醇、γ-松油烯、丁香酚为三者共有成分、但含量存在差异,而有些成分为两者共有或...     

宁夏马铃薯脱毒种薯产业的发展现状及对策

为宁夏自治区马铃薯种薯产业的发展提供理论依据和实践参考,介绍了宁夏马铃薯脱毒种薯产业的发展现状,详细分析了该产业在不断发展的过程中出现的主要问题,并提出了相应的对策措施。     

球花石楠种子育苗技术

从采种及种子处理、苗圃地选择、整地方式、播种方法及苗期管理、病虫害防治等方面阐述了球花石楠种子育苗技术,可为生产应用提供参考。     

危害沙棘的围连环夜蛾生物学特性及防治

围连环夜蛾在我国多有分布，但看见其幼虫的还是很少，因资料中寄主不祥，笔者经室内外观察。发现其危害多种植物的叶片，更喜欢危害沙棘树的叶片，笔者经2a的室内外观察得知。其生物学特性在辽宁西部每年1代，以蛹越夏及冬。对沙棘树危害较重，对栽植的大果沙棘危害尤为严重，在5a生的沙棘树上有100多头幼虫危害，成虫善飞翔。     

通用小型汽油机游车故障的一种非常规排除方法

分析了通用小型汽油机游车的原因，提出了一种较为经济的游车故障排除方法。     

低碳节约型园林的探索

随着社会经济和城市建设的迅速发展，自然资源和生态环境等面临着巨大压力，矛盾日益突出，本文主要结合目前非常流行的低碳经济讨论了建设节约型的园林。     

红松无性系种子园与实生种子园种实性状观测

建立红松无性系种子园和实生种子园的实践证明:嫁接母树的结实株数、结实率、公顷产种量、种子千粒重等9项种实性状均优于实生母树,关键种实性状指标结实率、公顷产种量、出种率、种子千粒重、出仁率分别是实生母树的3.67倍、2.74倍、1.16倍、1.02倍和1.12倍.     

国内气力式玉米精量排种器研究进展

近年来，我国机械化技术水平不断提高，精量播种正逐步取代传统的粗放式播种，从而降低了种植成本，同时提高了生产效率和利润。目前，我国玉米单产水平存在较大提升空间，提升玉米机械播种水平是提高玉米播种质量和增加产量的有效方式。本文对气力式玉米精量排种器的研究现状进行了综述，包括气吸式、气吹式和气压式3种类型，分别总结了其结构、工作原理和工作参数、性能、优势等，评述了试验效果；针对玉米精量排种器目前存在的问题进行了分析，并提出了未来的发展趋势，以期为促进玉米机械化生产提供参考。     

Effects of dietary oregano essential oil supplementation on growth performance,intestinal antioxidative capacity,immunity, and intestinal microbiota in yellow-feathered chickens

Essential oils are plant-derived aromatic volatile oils, and they contain bioactive compounds that have been shown to improve poultry nutrition. In this study, we investigated the effects of oregano essential oil (OEO) on intestinal antioxidative capacity, immunity, and gut microbiota of young yellow-feathered chickens. A total of nine hundred and sixty 1-d-old female Qingyuan partridge chickens were randomly allocated to four treatment groups with six replicates of 40 birds each, and the feeding trial was lasted for 30 d. The controls were fed on a basal diet without in-feed antibiotics; the birds in the antibiotic group were fed the basal diet supplemented with 20 mg/kg virginiamycin; the remaining birds were fed the basal diet containing 150 or 300 mg/kg OEO, respectively. Dietary supplementation with 150 or 300 mg/kg OEO increased average daily feed intake (P = 0.057) and average daily gain (P < 0.05). The activities of glutathione peroxidase and total antioxidative capacity in plasma, jejuna, and ileal mucosa were increased by OEO supplementation (P < 0.05), with a trend of lower jejunal content of malonaldehyde (P = 0.062). Moreover, dietary OEO increased the content of secretory immunoglobulin A (P = 0.078) and the relative expression of Claudin 1, Mucin 2, and Avain beta-defensin 1 in ileum (P < 0.05). Sequencing data of 16S rRNA indicated that dietary OEO increased the relative abundance of Firmicutes phylum, and Clostridium and Lactobacillus genera, and decreasing that of Romboutsia. Functional analyses indicated that microbial amino sugar and nucleotide sugar metabolism, replication, and repair systems were higher in OEO groups than those of controls and antibiotic treatment. In conclusion, dietary supplementation with OEO enhanced growth performance, alleviated local oxidative stress in intestine, improved production of natural antibodies, and favorably modulated intestinal microbiota composition.     

萝卜各级分枝种子质量比较

对萝卜各级分枝种子质量检验表明，萝卜各级分枝种子质量不一，以主轴顶端和基部新发枝种子质量最差，3级分枝种子质量最好，2分枝和1级分枝稍次。各分枝种子播种后，幼苗质量与种子室内检验质量结果相统一，1级、2级、分枝种子收获量最多，分别为种子收获总量的45％和38％。