全文获取类型
| 收费全文 | 454篇 |
| 免费 | 6篇 |
专业分类
| 农学 | 1篇 |
| 7篇 | |
| 综合类 | 373篇 |
| 水产渔业 | 3篇 |
| 畜牧兽医 | 66篇 |
| 园艺 | 6篇 |
| 植物保护 | 4篇 |
出版年
| 2020年 | 3篇 |
| 2019年 | 3篇 |
| 2018年 | 1篇 |
| 2017年 | 2篇 |
| 2016年 | 2篇 |
| 2015年 | 3篇 |
| 2014年 | 6篇 |
| 2013年 | 4篇 |
| 2012年 | 9篇 |
| 2011年 | 14篇 |
| 2010年 | 8篇 |
| 2009年 | 2篇 |
| 2008年 | 22篇 |
| 2007年 | 26篇 |
| 2006年 | 25篇 |
| 2005年 | 40篇 |
| 2004年 | 46篇 |
| 2003年 | 48篇 |
| 2002年 | 52篇 |
| 2001年 | 38篇 |
| 2000年 | 27篇 |
| 1999年 | 2篇 |
| 1998年 | 3篇 |
| 1997年 | 2篇 |
| 1996年 | 2篇 |
| 1995年 | 41篇 |
| 1994年 | 10篇 |
| 1993年 | 1篇 |
| 1992年 | 2篇 |
| 1991年 | 1篇 |
| 1990年 | 3篇 |
| 1988年 | 1篇 |
| 1987年 | 3篇 |
| 1986年 | 1篇 |
| 1985年 | 2篇 |
| 1984年 | 1篇 |
| 1981年 | 1篇 |
| 1975年 | 1篇 |
| 1972年 | 1篇 |
| 1970年 | 1篇 |
排序方式： 共有460条查询结果，搜索用时 31 毫秒
91.
92.
Powers MY Biery DN Lawler DE Evans RH Shofer FS Mayhew P Gregor TP Kealy RD Smith GK 《Journal of the American Veterinary Medical Association》2004,225(2):233-237
OBJECTIVE: To determine the relationship between the caudolateral curvilinear osteophyte (CCO) and osteoarthritis associated with hip dysplasia in dogs. DESIGN: Longitudinal cohort study. ANIMALS: 48 Labrador Retrievers from 7 litters. PROCEDURE: In each of 24 sex- and size-matched pairs fed the same diet, a restricted-fed dog was fed 25% less than a control dog for life. The dogs' hips were evaluated in the standard ventrodorsal hip-extended radiographic projection at 16, 30, and 52 weeks of age and then yearly for life. Histologic examination of hip joint tissues was performed on 45 dogs. RESULTS: Median age at death was 11.2 years. Adjusting for feeding group, dogs with a CCO were 3.7 times as likely to develop radiographic signs of osteoarthritis than those without a CCO. Stratified by diet, 100% of the control dogs with a CCO developed radiographic signs of osteoarthritis and 55% of restricted-fed dogs with a CCO developed radiographic signs of osteoarthritis. The CCO was the first radiographic change seen in 22 of 29 (76%) dogs with osteoarthritis. Overall, 35 of 37 (95%) dogs with a CCO had histopathologic lesions of osteoarthritis. CONCLUSIONS AND CLINICAL RELEVANCE: Results indicate a relationship between a CCO on the femoral neck and subsequent development of radiographic signs of osteoarthritis in Labrador Retrievers evaluated over their life span. A CCO is an important early radiographic indication of osteoarthritis associated with canine hip dysplasia. 相似文献
93.
Lawler A 《Science (New York, N.Y.)》2006,312(5779):1459
94.
Lawler A 《Science (New York, N.Y.)》2006,311(5767):1540-1543
95.
Greeley EH Spitznagel E Lawler DF Kealy RD Segre M 《Veterinary immunology and immunopathology》2006,111(3-4):287-299
Caloric restriction (CR) has been shown to retard immunosenescence and to extend median and maximum life span in rodent species. Longitudinal effects of CR on the canine immune system are presented in this report. A group of 48 Labrador Retrievers, divided at weaning into weight- and sex-matched pairs, were maintained on a diet restriction protocol from age 8 weeks until death. Each restricted dog received 75% of the total food consumed by its control-fed pair mate. Immune parameters were monitored from 4 to 13 years. CR retarded age-related declines in both lymphoproliferative responses and absolute numbers of lymphocytes and the T, CD4, and CD8-cell subsets. In females, CR attenuated the age-related increase in T-cell percentages and marginally retarded the age-related increase in memory cell percentages. Age-related changes in B-cell percentages and numbers were augmented by CR. No direct effect of CR on phagocytic activity of PMN, antibody production or NK cell activity, was observed. Lower lymphoproliferative responses, lower numbers of lymphocytes, T, CD4 and CD8 cells, lower CD8 percentages and higher B-cell percentages were all found to be significantly associated with a decreased likelihood of survival in these dogs. 相似文献
96.
97.
98.
99.
100.