全文获取类型
收费全文 | 2470篇 |
免费 | 230篇 |
专业分类
林业 | 6篇 |
农学 | 4篇 |
8篇 | |
综合类 | 30篇 |
农作物 | 3篇 |
水产渔业 | 4篇 |
畜牧兽医 | 2637篇 |
植物保护 | 8篇 |
出版年
2024年 | 2篇 |
2023年 | 52篇 |
2020年 | 95篇 |
2019年 | 3篇 |
2018年 | 59篇 |
2017年 | 67篇 |
2016年 | 40篇 |
2015年 | 68篇 |
2014年 | 104篇 |
2013年 | 109篇 |
2012年 | 66篇 |
2011年 | 82篇 |
2010年 | 76篇 |
2009年 | 85篇 |
2008年 | 68篇 |
2007年 | 50篇 |
2006年 | 34篇 |
2005年 | 31篇 |
2004年 | 57篇 |
2003年 | 61篇 |
2002年 | 68篇 |
2001年 | 63篇 |
2000年 | 58篇 |
1999年 | 68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 | 80篇 |
1990年 | 91篇 |
1989年 | 79篇 |
1988年 | 70篇 |
1987年 | 77篇 |
1986年 | 36篇 |
1985年 | 49篇 |
1984年 | 37篇 |
1983年 | 52篇 |
1982年 | 19篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1966年 | 1篇 |
1960年 | 1篇 |
1933年 | 1篇 |
1917年 | 1篇 |
1910年 | 1篇 |
排序方式: 共有2700条查询结果,搜索用时 0 毫秒
61.
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
62.
Erythrocyte and Biochemical Abnormalities as Diagnostic Markers in Dogs With Hemangiosarcoma Related Hemoabdomen 下载免费PDF全文
63.
64.
Kristina G. Miles DVM MS Jimmy C. Lattimer DVM MS Gary F. Krause PhD David W. Knapp DVM Candace E. Sayles DVM 《Veterinary radiology & ultrasound》1988,29(6):258-263
Sonographic evaluation of the pancreas was performed in ten healthy research dogs following intraperitoneal fluid administration. Physiological saline solution was aseptically introduced into the peritoneal cavity of each dog to create an acoustic window that would facilitate sonographic delineation of normal pancreatic tissues. Abdominal ultrasound examinations were performed in all dogs before and after the production of the diagnostic hydroperitoneum. Sonograms of the pancreas and other abdominal organs were scored on the basis of image clarity by experienced and novice ultrasonographers. Statistical analysis was then used to compare the effectiveness of each preparation method. A significant difference (P < 0.05) was established between the scores from the diagnostic hydroperitoneum sonograms and the baseline scans performed without intraperitoneal fluid placement. Sonographic visualization scores for the pancreas and other abdominal organs were increased following production of the diagnostic hydroperitoneum. These results indicate that the technique of diagnostic hydroperitoneum will significantly improve ultrasonographic visualization of the pancreas, and may prove useful in the diagnosis of canine pancreatic disease. 相似文献
65.
Cervical Intervertebral Disk Protrusion in a Horse 总被引:1,自引:0,他引:1
ALAN J. NIXON BVSc MS TED S. STASHAK DVM MS DiplomateACVS JAMES T. INGRAM DVM MS ROBERT W. NORRDIN DVM PhD DiplomateACVP RICHARD D. PARK DVM PhD DiplomateACVR 《Veterinary surgery : VS》1984,13(3):154-158
A Hansen type ll intervertebral disk protrusion was diagnosed in an 18-year-old horse with signs of progressive ataxia and paresis. A soft tissue mass dorsal to the C6-C7 intervertebral disk space was identified at myelogram and found to be an intervertebral disk protrusion with enlarged dorsal annulus fibrosis at surgery. Surgical decompression was achieved using a ventral approach to the caudal cervical vertebrae, an approach limited in its application by the vertebral venous sinuses. Neurological signs remained unchanged for 3 days and then deteriorated. The horse was euthanized. 相似文献
66.
Mila Freire DVM James Brown DVM Diplomate ACVR Ian D. Robertson BVSc Diplomate ACVR Anthony P. Pease DVM MS Diplomate ACVR Jonathan Hash BA Stuart Hunter DVM Diplomate ACVP Wendy Simpson DVM Andrea Thomson Sumrell RVT 《Veterinary surgery : VS》2010,39(5):545-552
Objective: To (1) determine prevalence of radiographically detectable meniscal mineralization in domestic cats and (2) to evaluate the association between meniscal mineralization and degenerative joint disease (DJD). Study Design: Prospective study. Animals: Client‐owned cats (n=100) and 30 feline cadavers. Methods: Randomly selected client‐owned cats were used to determine the prevalence of meniscal mineralization. Stifles from feline cadavers were used to evaluate the relationship between meniscal mineralization (using high‐resolution X‐ray), radiographic DJD, and cartilage damage. Menisci were evaluated histologically. Results: Forty‐six percent of the client‐owned cats had meniscal mineralization detected in 1 or both stifles. Pain scores were not significantly different between stifles with meniscal mineralization and those with no radiographic pathology (P=.38). Thirty‐four of 57 cadaver stifles had meniscal mineralization, which was always located in the cranial horn of the medial meniscus. Percentage mineralization of the menisci was significantly correlated with the cartilage damage score of the medial femoral (r2=0.6; P<.0001) and tibial (r2=0.5; P<.0001) condyles as well as with the total joint cartilage damage (r2=0.36; P<.0001) score and DJD score (r2=0.8; P<.0001). Conclusion: Meniscal mineralization is a common condition in domestic cats and seems to indicate medial compartment DJD. Clinical Relevance: Clinical significance of meniscal mineralization is uncertain. Further work is needed to determine if the meniscal mineralization is a cause, or a consequence of joint degeneration. 相似文献
67.
Randel H. Raub MS Kevin K. Kline MS Laurie M. Lawrence PhD Peter J. Bechtel PhD 《Journal of Equine Veterinary Science》1986,6(3)
The gluteus medius muscles were removed from a four-year-old female Welsh pony and her nine-month-old fetus. The muscles were divided into sections which were histochemically examined to determine the variation in the distribution of fast-twitch-glycolytic (FG), fast-twitch oxidative glycolytic (FOG), and slow-twitch oxidative (SO) muscle fibers throughout the entire cross-section of the muscle. The fetal muscle had a larger percent of FOG fibers and smaller percent of SO fibers than the same muscle from the mare. Variation in the distribution of muscle fiber type within the fetal gluteus medius was found. This is the first study of fiber type variation in fetal equine muscle. 相似文献
68.
Nora S. Matthews DVM Diplomate ACVA Sandee M. Hartsfield DVM MS Diplomate ACVA Brent Hague DVM Gwen L. Carroll DVM MS Diplomate ACVA Charles E. Short DVM PhD Diplomate ACVA 《Veterinary surgery : VS》1999,28(3):196-201
OBJECTIVE: To evaluate propofol for induction and maintenance of anesthesia, after detomidine premedication, in horses undergoing abdominal surgery for creation of an experimental intestinal adhesion model. STUDY DESIGN: Prospective study. ANIMALS: Twelve horses (424 +/- 81 kg) from 1 to 20 years of age (5 females, 7 males). METHODS: Horses were premedicated with detomidine (0.015 mg/kg i.v.) 20 to 25 minutes before induction, and a propofol bolus (2 mg/kg i.v.) was administered for induction. Propofol infusion (0.2 mg/kg/min i.v.) was used to maintain anesthesia. The infusion rate was adjusted to maintain an acceptable anesthetic plane as determined by muscle relaxation, occular signs, response to surgery, and cardiopulmonary responses. Oxygen (15 L/min) was insufflated through an endotracheal tube as necessary to maintain the SpO2 greater than 90%. Systolic (SAP), mean (MAP), and diastolic (DAP) arterial pressures, heart rate (HR), electrocardiogram (ECG), respiratory rate (RR), SpO2 (via pulse oximetry), and nasal temperature were recorded at 15 minute intervals, before premedication and after induction of anesthesia. Arterial blood gas samples were collected at the same times. Objective data are reported as mean (+/-SD); subjective data are reported as medians (range). RESULTS: Propofol (2.0 mg/kg i.v.) induced anesthesia (mean bolus time, 85 sec) within 24 sec (+/-22 sec) after the bolus was completed. Induction was good in 10 horses; 2 horses showed signs of excitement and these two inductions were not smooth. Propofol infusion (0.18 mg/kg/min +/- 0.04) was used to maintain anesthesia for 61 +/- 19 minutes with the horses in dorsal recumbency. Mean SAP, DAP, and MAP increased significantly over time from 131 to 148, 89 to 101, and 105 to 121 mm Hg, respectively. Mean HR varied over time from 43 to 45 beats/min, whereas mean RR increased significantly over anesthesia time from 4 to 6 breaths/min. Mean arterial pH decreased from a baseline of 7.41 +/- 0.07 to 7.30 +/- 0.05 at 15 minutes of anesthesia, then increased towards baseline values. Mean PaCO2 values increased during anesthesia, ranging from 47 to 61 mm Hg whereas PaO2 values decreased from baseline (97 +/- 20 mm Hg), ranging from 42 to 57 mm Hg. Muscle relaxation was good and no horses moved during surgery: Recovery was good in 9 horses and acceptable in 3; mean recovery time was 67 +/- 29 minutes with 2.4 +/- 2.4 attempts necessary for the horses to stand. CONCLUSIONS: Detomidine-propofol anesthesia in horses in dorsal recumbency was associated with little cardiovascular depression, but hypoxemia and respiratory depression occurred and some excitement was seen on induction. CLINICAL RELEVANCE: Detomidine-propofol anesthesia is not recommended for surgical procedures in horses if dorsal recumbency is necessary and supplemental oxygen is not available (eg, field anesthesia). 相似文献
69.
70.
Michael R. Metcalf DVM MS Louis C. Sellett MS James E. Smallwood DVM MS Donald E. Thrall DVM PhD Ben D. Harrington DVM 《Veterinary radiology & ultrasound》1989,30(3):111-118
Both foredigits and metacarpophalangeal joints of six Quarter Horse foals were scanned serially to six months of age using 99 Tc-methylene diphosphonate. Dorsal scans were made on day 1 and at two, four, six, ten, 14, 18, 22 and 26 weeks of age. Scans were assessed visually for distal third metacarpal, proximal phalangeal, and middle phalangeal physeal appearance and closure. Scans were also evaluated by computer region-of-interest (ROI) and line-profile analysis to characterize the physes quantitatively. Physeal region radioactivity relative to a disphyseal reference region was greatest at four weeks for all physes. Scintigraphic physeal closure of all physes occurred at approximately six months of age with a range of four and one half to greater than six months. The study was conducted to allow better assessment of diffuse and focal physeal disease by determining developmental times at which normal physeal region radioactivity has decreased enough to not obscure abnormal radioactivity and by quantifying scintigraphic physeal appearance which enables computer analysis to detect visually indeterminate physeal abnormalities. 相似文献