全文获取类型
收费全文 | 2413篇 |
免费 | 229篇 |
专业分类
林业 | 3篇 |
2篇 | |
综合类 | 12篇 |
农作物 | 1篇 |
水产渔业 | 4篇 |
畜牧兽医 | 2617篇 |
植物保护 | 3篇 |
出版年
2024年 | 2篇 |
2023年 | 52篇 |
2021年 | 1篇 |
2020年 | 93篇 |
2019年 | 1篇 |
2018年 | 59篇 |
2017年 | 65篇 |
2016年 | 40篇 |
2015年 | 67篇 |
2014年 | 104篇 |
2013年 | 109篇 |
2012年 | 64篇 |
2011年 | 80篇 |
2010年 | 76篇 |
2009年 | 83篇 |
2008年 | 67篇 |
2007年 | 48篇 |
2006年 | 35篇 |
2005年 | 27篇 |
2004年 | 57篇 |
2003年 | 57篇 |
2002年 | 64篇 |
2001年 | 61篇 |
2000年 | 56篇 |
1999年 | 67篇 |
1998年 | 102篇 |
1997年 | 101篇 |
1996年 | 80篇 |
1995年 | 79篇 |
1994年 | 71篇 |
1993年 | 89篇 |
1992年 | 104篇 |
1991年 | 81篇 |
1990年 | 93篇 |
1989年 | 76篇 |
1988年 | 69篇 |
1987年 | 76篇 |
1986年 | 34篇 |
1985年 | 48篇 |
1984年 | 34篇 |
1983年 | 48篇 |
1982年 | 18篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有2642条查询结果,搜索用时 0 毫秒
51.
Perception of Teaching and Assessing Technical Proficiency in American College of Veterinary Surgeons Small Animal Surgery Residency Programs 下载免费PDF全文
52.
53.
A.E. Wanger DVM MS W.W. Muir III DVM Phd R.M. Bednaraki DVM MS 《Journal of Veterinary Emergency and Critical Care》1991,1(1):14-18
The purpose of this study was to determine whether lingual vanous blood gas samples reflect arterial acid-base gas status in anethetized dogs. Heparinized blood samples were drawn simultaneously from the lingual vein and a peripheral artery in 50 anestheized dogs that were clinical surgical patients, as well as from four experimental dogs in which hemorrahaic shock was being studied. Blood pH, oxygen tension (PO2 ), and bicarbonate (HCO3- )) from the two sources in clinical patients showed significant liner correlation, although arterial PO2 )(PaO2 )) tended to be approximately 110mm Hg higher than lingual venous PO2 ). During hemorrahgic shock, however, PaO2 ) and PaCO2 ) were significantly different from lingual venous PO2 ) and PCO2 ), Lingula venous blood gas analysis may be useful in assessing acid-base and blood gas status in routline cases, but should not be relied upon in dogs with low cardiac output or poor perfusion. 相似文献
54.
R. J. TODHUNTER BVSc MS PhD Diplomate ACVS K. P. FREEMAN DVM PhD A. E. YEAGER dvm G. LUST PhD 《Veterinary surgery : VS》1993,22(5):330-342
This study assessed the effects of postoperative exercise and intra-articular polysulfated glycosaminoglycan (PSGAG) on the repair of osteochondral defects in the carpal joints of ponies. Eighteen ponies with normal carpi had osteochondral defects (mean dimensions 2.4 cm × 0.9 cm) created arthroscopically on the dorsal aspect of the distal articular surface of the radial carpal bone. The ponies were randomized (while balancing for age [range, 2 to 15 years; median, 5.0 years]) to two groups—nine ponies were exercised and nine were stall confined. Beginning at surgery, six ponies in each group received five weekly intra-articular injections of PSGAG (250 mg) in one joint and lactated Ringer's solution in the contralateral joint; the remaining three ponies in each group received lactated Ringer's solution in both joints. The incremental exercise schedule on a circular, rotating walker was begun six days after surgery and occurred twice daily, reaching a maximum of 0.7 miles of walking and 2.7 miles of trotting by the third postoperative month. The effects of treatment on the joint tissues were determined by weekly lameness examinations and measurement of the range of carpal joint motion, carpal radiographs at six and 17 weeks after surgery, synovial fluid analysis, and cytologic evaluation of alcohol-fixed synovial fluid specimens at weeks 1 through 4 and week 17, and histology of the synovial membrane. Ultrasound images of the carpi were acquired before operation and at weeks 1, 2, 4, 8, 10, 13, and 17. Ponies were euthanatized 17 weeks after surgery. Exercise, without medication, caused more lameness throughout the study compared with no exercise. Exercised, nonmedicated ponies had the greatest limitation to carpal flexion (more painful joints), and nonexercised, nonmedicated (control) ponies had the least limitation to flexion. Radiographic scores indicated that the exercised, nonmedicated ponies had significantly (p < .05) more signs of osteoarthritis than exercised, medicated and control ponies. Ultrasonographic measurements indicated that exercise, without medication, caused the greatest increase in combined measurement of the joint capsule thickness and synovial fluid accumulation at all postoperative times. Synovial lining cell numbers in the synovial fluid from exercised ponies were significantly (p < .05) higher than in nonexercised ponies at week 1, and this trend continued at weeks 4 and 17 (p < .1). There were significantly (p < .05) more morphologic abnormalities in the synovial lining cells from exercised than from nonexercised ponies at week 17. Medication with PSGAG enabled exercised carpal joints to be flexed significantly further from weeks 2 through 6 compared with nonmedicated joints. Medication significantly (p < .05) reduced the combined joint capsule and synovial fluid thickness at weeks 4, 8, and 13 compared with nonmedicated joints. On histologic examination, the synovial membrane matrix of exercised, medicated joints had significantly less chronic inflammatory changes than joints receiving other treatments. The authors concluded that this level of exercise was too intense when superimposed on large osteochondral defects in the carpus because it induced osteoarthritis. Polysutfated gtycosaminoglycan ameliorated the clinical signs of osteoarthritis in the exercised ponies. However, PSGAG was also associated with the formation of cartilage repair tissue that contained less type II relative to type I collagen compared with repair tissue from nonmedicated joints. 相似文献
55.
56.
Nutritional analysis and microbiological evaluation of commercially available enteral diets for cats 下载免费PDF全文
57.
B.D. Scott BS MS G.D. Potter PhD J.W. Evans PhD J.C. Reagor PhD G.W. Webb PhD S.P. Webb MS 《Journal of Equine Veterinary Science》1989,9(4)
Twenty-four yearlings were used to evaluate the efficacy of feeding feed-grade fat to growing horses. All horses were started on trial at 13-months-of-age and were fed for 112 days. The experimental diets, containing similar nutrient-to-calorie ratios, were: 1) control (no added fat; 2) 5% added fat and; 3) 10% added fat. There was a trend for yearlings fed the 10% added fat diet to grow faster and eat less feed than those on the control diet. Data from this study indicate that feed-grade fat can be safely fed to growing horses. Feeding fat to yearlings stimulated growth and efficiency of feed utilization initially, but these effects were not maintained as the yearlings grew toward maturity. 相似文献
58.
CHAD S. O'BRIEN DVM STEVEN A. MARTINEZ DVM MS Diplomate ACVS 《Veterinary surgery : VS》2009,38(7):868-873
Objective— To evaluate potential iatrogenic medial meniscal (MM) damage during tibial plateau leveling osteotomy (TPLO) and to establish a safe zone (SZ) for hypodermic needle (HN) identification of the medial aspect of the stifle joint.
Study Design— Prospective cohort.
Animals— Cadaveric canine stifles (n=40).
Methods— HN (20 or 25 G) were inserted through the medial collateral ligament (MCL) of the femorotibial joint and through the SZ insertion points. The medial meniscus was inspected for iatrogenic damage. Statistical comparison of MM damage caused by different needle sizes and insertion sites was performed using Fisher's exact test with significance at P <.05.
Results— Twenty-gauge group: 65% of stifles had minor MM damage with MCL insertion compared with 35% of stifles with SZ insertion ( P =.0049). Severe MM damage occurred in 25% of stifles with MCL insertion compared with 0% of stifles with SZ insertion ( P =.0014). Twenty-five-gauge group: 85% of stifles had minor MM damage with MCL insertion compared with 30% after SZ insertion ( P =.0011); however, no severe MM injury was noted.
Conclusions— HN insertion though the MCL can produce iatrogenic damage to the MM. Use of a 25 G HN and SZ site for insertion reduced the frequency and severity of MM damage.
Clinical Relevance— HN insertion into the medial aspect of the femorotibial joint during TPLO can cause gross iatrogenic MM damage, which may contribute to the incidence and misdiagnosis of latent MM injuries after TPLO. 相似文献
Study Design— Prospective cohort.
Animals— Cadaveric canine stifles (n=40).
Methods— HN (20 or 25 G) were inserted through the medial collateral ligament (MCL) of the femorotibial joint and through the SZ insertion points. The medial meniscus was inspected for iatrogenic damage. Statistical comparison of MM damage caused by different needle sizes and insertion sites was performed using Fisher's exact test with significance at P <.05.
Results— Twenty-gauge group: 65% of stifles had minor MM damage with MCL insertion compared with 35% of stifles with SZ insertion ( P =.0049). Severe MM damage occurred in 25% of stifles with MCL insertion compared with 0% of stifles with SZ insertion ( P =.0014). Twenty-five-gauge group: 85% of stifles had minor MM damage with MCL insertion compared with 30% after SZ insertion ( P =.0011); however, no severe MM injury was noted.
Conclusions— HN insertion though the MCL can produce iatrogenic damage to the MM. Use of a 25 G HN and SZ site for insertion reduced the frequency and severity of MM damage.
Clinical Relevance— HN insertion into the medial aspect of the femorotibial joint during TPLO can cause gross iatrogenic MM damage, which may contribute to the incidence and misdiagnosis of latent MM injuries after TPLO. 相似文献
59.
KAREN J. WHITEHAIR DVM MS STEPHEN B. ADAMS DVM MS Diplomate ACVS JAMES P. TOOMBS DVM MS Diplomate ACVS JILL E. PARKER VMD Diplomate ACVS JOSEPH M. PROSTREDNY DVM MS JON G. WHITEHAIR DVM SEAN W. AIKEN DVM 《Veterinary surgery : VS》1992,21(3):228-233
A llama, a miniature horse, and a miniature donkey with severe bilateral congenital flexural deformities of the metacarpophalangeal and metatarsophalangeal joints were treated successfully by arthrodesis with dynamic compression plating or external skeletal fixation. The flexor tendons were more taut than the suspensory ligaments and were transected. In the llama, the suspensory ligament was transected, and overcorrection caused ischemic necrosis of one distal limb and subluxation of the other fetlock joint. In the horse and donkey, the suspensory ligament was preserved and wedge osteotomy was performed to correct the deformity. 相似文献
60.
Erythrocyte and Biochemical Abnormalities as Diagnostic Markers in Dogs With Hemangiosarcoma Related Hemoabdomen 下载免费PDF全文