全文获取类型
收费全文 | 349篇 |
免费 | 10篇 |
专业分类
林业 | 5篇 |
农学 | 3篇 |
基础科学 | 1篇 |
20篇 | |
综合类 | 116篇 |
农作物 | 3篇 |
水产渔业 | 5篇 |
畜牧兽医 | 198篇 |
园艺 | 3篇 |
植物保护 | 5篇 |
出版年
2017年 | 7篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 8篇 |
2012年 | 8篇 |
2011年 | 5篇 |
2010年 | 7篇 |
2008年 | 10篇 |
2007年 | 10篇 |
2006年 | 6篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 8篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 8篇 |
1991年 | 14篇 |
1990年 | 10篇 |
1989年 | 18篇 |
1988年 | 17篇 |
1987年 | 9篇 |
1986年 | 16篇 |
1985年 | 17篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1974年 | 5篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1938年 | 4篇 |
1932年 | 2篇 |
1924年 | 2篇 |
1922年 | 2篇 |
1918年 | 2篇 |
1905年 | 3篇 |
1884年 | 3篇 |
排序方式: 共有359条查询结果,搜索用时 0 毫秒
11.
Bovine congenital defects: variations of internal hydrocephalus 总被引:2,自引:0,他引:2
12.
13.
Wilson GH Greene CE Greenacre CB 《Journal of the American Veterinary Medical Association》2003,222(8):1093-6, 1077
A 1.5-year-old ferret examined because of seizures was found to have low serum calcium, high serum phosphorus, and extremely high serum parathyroid hormone concentrations. Common causes of these abnormalities, including nutritional secondary hyperparathyroidism, chronic renal secondary hyperparathyroidism, tumor lysis syndrome, and hypomagnesemia, were ruled out, and a tentative diagnosis of pseudohypoparathyroidism was made. Pseudohypoparathyroidism is a hereditary condition in people that, to our knowledge, has not been identified in ferrets previously and is caused by a lack of response to high serum parathyroid hormone concentrations, rather than a deficiency of this hormone. The ferret improved after treatment with dihydrotachysterol (a vitamin D analog) and calcium carbonate. It was still doing well after 3.5 years of continued treatment. 相似文献
14.
Pacharinsak C Greene SA Keegan RD Kalivas PW 《Journal of veterinary pharmacology and therapeutics》2003,26(1):71-77
This investigation was carried out to compare the postoperative analgesia and plasma morphine concentrations in dogs given epidural morphine or epidural morphine combined with medetomidine prior to surgery. Twelve dogs (seven males and five females) with ruptured cranial cruciate ligaments presented to the Washington State University Veterinary Teaching Hospital. Six dogs received an epidural injection of morphine (0.1 mg/kg) and six dogs received epidural morphine (0.1 mg/kg) combined with medetomidine (0.005 mg/kg). Numeric rating scale (NRS) pain scores and cumulative pain scores (CPS) were assigned to 10-min segments of video. Video segments, heart rates and respiratory rates were recorded prior to premedication and at 4, 8, 12, 18 and 24 h after epidural injection. Blood was sampled from the cephalic vein at each of these times and during anesthesia at 0.5, 1, 2 and 3 h after epidural injection. Data were analyzed using either Friedman's test or one-way anova for repeated measures. In the morphine group, significant increases compared with premedication values were detected at 4, 8 and 12 h after epidural injection for NRS and at 4 and 12 h after epidural injection for CPS. In the morphine plus medetomidine group, NRS was significantly higher at 4 and 8 h whereas there were no differences from baseline values for CPS. Plasma morphine concentrations were not significantly different between treatment groups, but were significantly increased compared with preinjection values at 0.5, 1, 12, 18, and 24 h in the morphine plus medetomidine group. Epidurally administered morphine combined with medetomidine was associated with only minor benefits based on subjective pain scoring when compared with morphine alone in these dogs undergoing repair of a ruptured cranial cruciate ligament. 相似文献
15.
Sprinkle JE Holloway JW Warrington BG Ellist WC Stuth JW Forbes TD Greene LW 《Journal of animal science》2000,78(6):1608-1624
The objective of this study was to determine whether digesta kinetics, energy intake (EI, kcal ME intake x kg(-.75) x d(-1)), grazing behavior, or body temperature differed by breed, lactational state, or season of the year among cattle presumed to vary in adaptability to the subtropics. Two-year-old lactating and nonlactating Brahman x Angus (BA; n = 5, n = 5), Tuli x Angus (TA; n = 5, n = 4), and Angus (A; n = 4, n = 4) cows were used. During both early (ES) and late summer (LS), lactating cattle vs nonlactating cattle had greater gastrointestinal tract load (CM2) and EI (P < .01), although passage rate did not differ (P > .48). During LS, lactating cattle had decreased early morning rectal temperatures (P < .05) and spent more time grazing during the day compared with nonlactating cattle (P < .001). Among breeds, A had the largest CM2 (P < .01 compared with BA and P = .068 compared with TA) and accumulated the greatest heat during the day (P < .05). Due to greater daytime shading (P < .01) and less daytime grazing (P < .05), A had lower (P < .05) early morning and comparable (P > .26) late afternoon rectal temperatures compared with BA and TA. With data pooled over both grazing trials, BA cattle had the smallest CM2 (P < .01), and in ES they spent the least amount of time in the shade (P < .001). The TA spent more time in the shade than did BA (P < .001) during ES and less during LS (P < .001) and had similar (P > .28) early morning rectal temperatures compared with BA during ES and LS. During LS, TA spent more time in the sun and less time in the shade than did either A or BA (P < .001). During ES, EI did not differ among breeds (P > .50). During LS, EI for lactating A was greater than for BA and TA (P < .05), and EI for nonlactating BA was less than for A and TA (P < .05). Bite rate per minute for lactating cattle during ES was reduced (P < .03) by increased body condition score. Tuli x Angus cattle appear to be comparable to BA with respect to heat adaptation. It appears that EI demands are greater in a hot environment. 相似文献
16.
17.
Hypoalbuminemia-related platelet hypersensitivity in two dogs with nephrotic syndrome 总被引:1,自引:0,他引:1
R A Green E A Russo R T Greene A L Kabel 《Journal of the American Veterinary Medical Association》1985,186(5):485-488
Platelet aggregation studies in 2 dogs with nephrotic syndrome disclosed increased platelet sensitivity to a low dose of adenosine diphosphate. Subsequent studies with isolated platelets and plasma indicated that a plasma factor was responsible primarily for inducing platelet hypersensitivity. The increased platelet aggregation response was corrected by increasing the albumin concentration of the plasma. The study suggested an important role for albumin in modulating platelet aggregation and may partially explain the tendency toward thrombosis noted in hypoalbuminemic dogs with nephrotic syndrome. 相似文献
18.
An Update on the Serodiagnosis of Canine Lyme Borreliosis 总被引:1,自引:0,他引:1
Russell T. Greene DVM PhD 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1990,4(3):167-171
The first report of canine Lyme borreliosis was published in 1984, and since that time there have been numerous reports. Clinical manifestations have varied, and serology is often used to make the diagnosis. This review is designed to inform veterinary clinicians about the current serologic tests and their limitations. In endemic areas, the fact that up to 50% of the canine population can be asymptomatic, yet seropositive, suggests that positive antibody titers do not necessarily indicate the presence of disease. Instead, the presence of a positive antibody titer should be considered evidence of exposure to the agent. Many dogs apparently are exposed to the agent of Lyme borreliosis but do not come down with the disease. Immunoblots are not able to distinguish between infection versus exposure. Newer diagnostic tests, such as antigen assays, are being evaluated. However, the fact that spirochetes have been isolated from 8% of asymptomatic dogs living in an endemic area is evidence that these tests will also need to be cautiously interpreted. Our inability to characterize the relationship between clinical signs and serology has hampered our understanding of canine Lyme disease. Presently, the diagnosis should be one of exclusion. A diagnosis of Lyme borreliosis should be considered confirmed only when other diseases are completely ruled out. 相似文献
19.
Rocky Mountain spotted fever in dogs and its differentiation from canine ehrlichiosis 总被引:4,自引:0,他引:4
C E Greene W Burgdorfer R Cavagnolo R N Philip M G Peacock 《Journal of the American Veterinary Medical Association》1985,186(5):465-472
Rocky Mountain spotted fever (RMSF) or ehrlichiosis was diagnosed in dogs on the basis of specific immunofluorescent testing for each disease. Comparisons between clinical and laboratory findings were made between the 2 diseases. The incidence of RMSF tended to be more seasonal and it affected younger dogs. Purebred dogs appeared to be more susceptible to both diseases. In general, RMSF had a more rapid and severe course of clinical illness than did ehrlichiosis, but acute ehrlichiosis was difficult to differentiate from RMSF. Both diseases were characterized by fever, depression, lymphadenopathy, and signs of neurologic dysfunction; petechial hemorrhages or other signs of hemorrhagic diathesis were evident only in a small proportion of cases. Anemia, leukopenia, and thrombocytopenia were more common in dogs with ehrlichiosis, whereas those with RMSF more often had leukocytosis and thrombocytopenia. Hypoalbuminemia was found in dogs with both diseases, but those with ehrlichiosis usually had concurrent hyperglobulinemia. High serum alkaline phosphatase activity and serum cholesterol concentration, and low serum calcium concentration were more common in dogs with RMSF than with ehrlichiosis. Rising serum titers or positive direct immunofluorescence for Rickettsia rickettsii in skin biopsy specimens were used to confirm RMSF, whereas a single serum titer for Ehrlichia canis enabled detection of ehrlichiosis. In the absence of neurologic deficits and when dogs were treated with tetracycline, dogs with RMSF made a more rapid and consistent recovery than did dogs with ehrlichiosis. 相似文献
20.