全文获取类型
收费全文 | 2088篇 |
免费 | 151篇 |
国内免费 | 151篇 |
专业分类
农学 | 16篇 |
基础科学 | 5篇 |
38篇 | |
综合类 | 517篇 |
农作物 | 1篇 |
水产渔业 | 5篇 |
畜牧兽医 | 1808篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 51篇 |
2021年 | 96篇 |
2020年 | 95篇 |
2019年 | 143篇 |
2018年 | 78篇 |
2017年 | 90篇 |
2016年 | 97篇 |
2015年 | 71篇 |
2014年 | 84篇 |
2013年 | 99篇 |
2012年 | 151篇 |
2011年 | 152篇 |
2010年 | 126篇 |
2009年 | 124篇 |
2008年 | 103篇 |
2007年 | 145篇 |
2006年 | 150篇 |
2005年 | 103篇 |
2004年 | 80篇 |
2003年 | 45篇 |
2002年 | 44篇 |
2001年 | 34篇 |
2000年 | 26篇 |
1999年 | 59篇 |
1998年 | 23篇 |
1997年 | 15篇 |
1996年 | 13篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1993年 | 14篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1956年 | 2篇 |
排序方式: 共有2390条查询结果,搜索用时 218 毫秒
31.
《The Journal of Applied Poultry Research》2015,24(2):99-104
Natural clinoptilolite has been shown to have positive effects as an antioxidant, which means it traps free radicals in its complex structure, inactivating and eliminating them. Synthetic or modified clinoptilolite delays lipid peroxidation with water-soluble peroxyl radicals, and reduces the catalytic production of radicals to protect the organism. The objective of this study was to evaluate the effect of natural clinoptilolite and modified clinoptilolite on the antioxidant status of broilers. The antioxidant capability of natural clinoptilolite or modified clinoptilolite is exerted, at least in part, by increasing glutathione content in liver and intestinal mucosa, the superoxide dismutase, and glutathione peroxidase activity in serum, liver, and intestinal mucosa. In addition, to enhance broiler performance, there is a reduction of the concentration of malondialdehyde in serum, liver, and intestinal mucosa. 相似文献
32.
33.
Oxidative stress is ubiquitous in livestock and poultry production.When the body is in the situation of harmful stimulation in vitro or in vivo,the oxidation system and antioxidant system are in a state of imbalance,leading to metabolic disorders,which depresses the growth and development of animals,decreases disease resistance and quality of livestock products seriously,and has a negative impact on the production and health of livestock and poultry.So it is important to find an effective measure to alleviate the health of livestock and poultry.Lipoic acid,tea polyphenol,VE and other antioxidants play significant roles in reducing oxidative stress.In this paper,the effects of oxidative stress on broiler and mitigation technology research were outlined. 相似文献
34.
35.
36.
37.
38.
Min Zhang Dan Zheng Zhimei Peng Yuting Zhu Rongrong Li Qiong Wu Yan Li Hongyi Li Weihua Xu Mao Zhang Qichun Hung Yanfa Sun 《The Journal of Poultry Science》2021,58(2):131
In this study, signaling pathways and key differentially expressed genes (DEGs) involved in lipid metabolism in muscle and fat tissues were investigated. Muscle and abdominal fat tissues were obtained from 35-day-old female broilers for RNA sequencing. DEGs between muscle and fat tissues were identified. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses of DEGs were performed. A total of 6130 DEGs were identified to be significantly enriched in 365 GO terms, most of which were involved in biological processes, cellular components, and molecular functions in muscle and fat tissues. Three important lipid signaling pathways (pyruvate metabolism, the insulin signaling pathway, and the adipocytokine signaling pathway) were identified among the fat and muscle tissues of broilers. The key common DEGs in these pathways included phosphoenolpyruvate carboxykinase 2 (PCK2), acetyl-CoA carboxylase 1 alpha and beta (ACACA and ACACB), and the mitogen-activated protein kinase (AMPK) gene family. Hence, our findings revealed the pathways and key genes and gene families involved in the regulation of fat deposition in the muscle and fat tissues of broilers. 相似文献
39.
40.
Jutamart KONGKAPAN Saranya POAPOLATHEP Supaporn ISARIYODOM Susumu KUMAGAI Amnart POAPOLATHEP 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(2):259-264
Mycotoxins are secondary fungal metabolites that are typically present in grain and feed ingredients used for
animal feeds. An analytical method using LC-ESI-MS/MS was developed to quantify nine mycotoxins, consisting of
aflatoxin B1 (AFB1), AFB2, AFG1, AFG2, T-2 toxin,
deoxynivalenol (DON), nivalenol (NIV), zearalenone (ZEA) and ochratoxin A (OTA) in broiler feeds. In total,
100 samples of broiler feeds were collected from poultry farms in Central Thailand. The survey found that
AFB1 and ZEA were the most prevalent mycotoxins in the feed samples at percentages of 93% and
63%, respectively. The limit of detections (LODs) of investigated mycotoxins was 0.20–0.78
ng/g. AFB2, DON, AFG1, NIV and T-2 toxin were also detectable at low
contamination levels with percentages of 20%, 9%, 7%, 5% and 1%, respectively, whereas OTA and AFG2
were not detected in any of the feed samples. These results suggest that there is a very low level of risk of
the exposure to mycotoxins in feeds obtained from broiler farms in Central Thailand. 相似文献