首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2069篇
  免费   96篇
  国内免费   234篇
林业   202篇
农学   151篇
基础科学   133篇
  567篇
综合类   750篇
农作物   66篇
水产渔业   52篇
畜牧兽医   347篇
园艺   25篇
植物保护   106篇
  2024年   12篇
  2023年   47篇
  2022年   68篇
  2021年   64篇
  2020年   66篇
  2019年   87篇
  2018年   57篇
  2017年   83篇
  2016年   88篇
  2015年   89篇
  2014年   97篇
  2013年   110篇
  2012年   134篇
  2011年   144篇
  2010年   142篇
  2009年   119篇
  2008年   97篇
  2007年   132篇
  2006年   101篇
  2005年   99篇
  2004年   74篇
  2003年   67篇
  2002年   55篇
  2001年   56篇
  2000年   54篇
  1999年   35篇
  1998年   35篇
  1997年   32篇
  1996年   24篇
  1995年   30篇
  1994年   16篇
  1993年   16篇
  1992年   17篇
  1991年   14篇
  1990年   11篇
  1989年   8篇
  1988年   3篇
  1987年   3篇
  1986年   7篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1979年   1篇
  1976年   1篇
排序方式: 共有2399条查询结果,搜索用时 15 毫秒
21.
蛋鸡中发现J亚群白血病与网状内皮增生症自然混合感染   总被引:12,自引:3,他引:12  
发病蛋鸡经组织学、免疫组化检测确诊为J亚群白血病与网状内皮增生症混合感染。与人工接种病例不同的是,在肿瘤组织内还发现一种特殊的细胞——淋巴-巨噬细胞;在骨髓和肿瘤组织中检测到部分髓细胞胞浆内有ALV—J抗原表达。从发病情况、各器官病变程度及免疫组化结果来看,2种病原存在明显的相互协同作用,脾可能是网状内皮增生症的原发器官。但其发病的时间可能不如J亚群白血病早。此次在蛋种鸡发现此混合感染提示,病毒在环境选择压及免疫选择压的作用下,其生物特性、致病作用以及宿主范围均可发生改变。应警惕J亚群白血病和网状内皮增生症混合感染在蛋鸡中的大面积暴发。  相似文献   
22.
利用南方农区丰富的农田资源,大力发展草地畜牧业,引草入田,是发挥草业优势,突破农村发展瓶颈,增加农民收入的一项重要措施。探讨了西南地区农田的主要种植草种以及适宜西南地区的种植利用模式。  相似文献   
23.
Feather pecking is still a behavioral problem in laying hen flocks, resulting in impaired welfare and economic losses. Environment enrichment, e.g., providing access to litter, to increase foraging behavior in laying hens has been shown to decrease feather pecking. This study investigated the effect of spreading crushed mussel shells (particle size 10 to 20 mm) in the litter area as an environment enrichment and source of calcium for layers receiving a commercial feed and for layers given a feed with 40% less calcium. These treatments were compared with a control involving hens given the commercial feed, but no mussel shells in the litter. The study included 900 Dekalb White layers housed in a single-tier floor system during a production cycle (20 to 72 wk of age). The mussel shells were consumed to a lower extent than predicted, resulting in calcium deficiency in hens fed the low-calcium diet. This in turn was evident as increased degree of keel bone deviations and lower eggshell breaking strength. Daily addition of crushed mussel shells to the litter for laying hens on a balanced or calcium-deficient diets did not generate any positive effects on bird feather cover, eggshell quality, production performance, or fearfulness. Hence, with the particle size of mussel shells used in this study, there was no indication of improved welfare due to environment enrichment.  相似文献   
24.
Thymoquinone (TQ) is the major constituent of Nigella sativa and known to possess a variety of pharmacological effects. This study was designed to evaluate the pharmacokinetic profile of TQ following oral (PO) and intravenous (IV) administration in layer chickens. The layer chickens were equally divided into two groups (six chickens in each group, total 12 chickens), and TQ was administered via PO and IV routes. For PO route, the dose was 20 mg/kg b.w. and for IV route, 5 mg/kg b.w. was administered, respectively. A sensitive and accurate High‐Performance Liquid Chromatography (HPLC) technique was validated for the quantification of TQ from plasma. The limit of detection (LOD) and limit of quantification (LOQ) were 0.02 µg/ml and 0.05 µg/ml, respectively with >80% recovery. Maximum plasma concentration (Cmax) following PO and IV administration was 8.805 and 4.497 µg/ml, respectively, while time to reach at maximum concentration (Tmax) was 1 and 0.1 hr, respectively. The elimination half‐lives were recorded as 1.02 and 0.978 hr, whereas the mean residence times were 1.79 and 1.036 hr following both PO and IV administration, respectively. The 85% PO bioavailability was indicative that TQ could be used for various therapeutic purposes in layer chickens.  相似文献   
25.
樊月钢 《家畜生态》1993,14(3):4-5,19
本试验以营养因子、产蛋率、钙源、笼养生态等角度对笼养蛋鸡疲劳症进行综合研究,寻找引起笼养蛋鸡疲劳症的主要因素及减少笼养蛋鸡疲劳症的途径。  相似文献   
26.
27.
28.
Measurements of intestinal wall thicknesses from ultrasound imaging (US) are routinely used to support diagnoses of intestinal disorders in cats, however published studies describing observer agreement are currently lacking. The aim of this retrospective, observer agreement study was to quantify inter- and intraobserver repeatability and agreement in the measurement of intestinal wall layer thicknesses and the segmentation of transverse sections of small intestines in US images of 20 cats. Intestinal wall layer thickness measurements of the mucosa, submucosa, muscularis, serosa layer, and total thickness of these layers were performed on five cats with small cell epitheliotropic lymphoma, five with inflammatory bowel disease, and 10 with other conditions. Thickness measurements and the segmentation encompassing the serosa layer were obtained from five observers four times non-sequentially. The average standard deviation in thickness measurements (95% confidence interval) in the mucosa, submucosa, muscularis, serosa, and total thickness were 0.35 (0.07–0.95), 0.24 (0.07-0.52), 0.22 (0.06-0.49), 0.20 (0.05-0.49), and 0.57 (0.11-1.60) mm, respectively. The average intraclass correlation coefficients, which estimates the degree of consistency in thickness measurements and segmentation areas for each observer, ranged from 0.355 to 0.870 and 0.850 to 0.993, respectively. The interclass correlation coefficient, which estimates the degree of consistency when measuring a thickness or segmentation area over all observers ranged from 0.115 to 0.753, and 0.811 to 0.902, respectively. The overall average Dice Coefficient, which estimates the extent of overlap of the segmentations for all observers was 0.957 (0.933 to 0.972). Our results suggest segmentations of small intestines have a higher interobserver agreement than measurements of intestinal wall thicknesses.  相似文献   
29.
1. In commercial layer breeding, extensive gene pools are tested and selected for market requirements which must be anticipated at least 5 years ahead. Field results confirm a continuous positive genetic trend in egg output and better feed efficiency which can be converted into land savings.

2. Animal welfare and cage-free housing dominate future needs of the market. Nesting behaviour and minimal tendency to develop feather-pecking or cannibalism without beak treatment are key trait complexes. Stronger shells for longer production cycles without moulting have to be combined with better bones.

3. No single big gene effect can be expected to control the multifactorial problem of feather-pecking. Adjusting the shape of the beak, with a heritability of .10–.25, can contribute to reducing the risk of severe cannibalism.

4. For better skeletal integrity, the assessment of bone quality in pedigree birds housed in enriched cages is done by keel bone palpation or ultrasound measurement of the humerus. Both traits show similar heritabilities in the range of .15–.30 and can be included in a balanced selection approach for performance, quality and welfare traits.

5. The combination of performance testing and genome-wide DNA marker analysis is a promising tool to generate more progress for a balanced performance and behaviour profile.  相似文献   

30.
产蛋鸡日粮内低芥酸、低硫甙菜籽粕营养价值的研究   总被引:8,自引:0,他引:8  
本文分析了国产低芥酸、低硫甙菜籽粕营养及抗营养成分。选21周龄罗曼蛋鸡500只随机均分为5组 ,分别饲喂全豆粕和10 %、15 %、17 %、20 %双低菜籽粕日粮 ,试期35周。结果表明 :双低菜籽粕的蛋白质品质不及豆粕 ,硫甙及其分解产物仅为普通菜籽的1/3左右 ,植酸和单宁含量较高。在日粮中添加10 %、15 %双低菜粕对蛋鸡的生产性能、甲状腺、肝、肾及血清中TSH、T3、T4 和血浆中GPT、GOT的活性等均无异常影响(P>0.05)。添加17 %、20 %双低菜籽粕 ,蛋鸡产蛋量及料蛋比不佳(P<0.05) ,甲状腺、肝等器官有一定异常变化 ,但未见明显肿大(P>0.05)。血清T3、T4、TSH及血浆GOT、GPT无异常变化(P>0.05)。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号