全文获取类型
收费全文 | 419篇 |
免费 | 55篇 |
专业分类
林业 | 16篇 |
农学 | 6篇 |
基础科学 | 10篇 |
42篇 | |
综合类 | 62篇 |
农作物 | 42篇 |
水产渔业 | 12篇 |
畜牧兽医 | 274篇 |
园艺 | 7篇 |
植物保护 | 3篇 |
出版年
2022年 | 3篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 9篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2015年 | 9篇 |
2014年 | 19篇 |
2013年 | 28篇 |
2012年 | 21篇 |
2011年 | 12篇 |
2010年 | 14篇 |
2009年 | 9篇 |
2008年 | 30篇 |
2007年 | 17篇 |
2006年 | 15篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 19篇 |
1999年 | 6篇 |
1998年 | 6篇 |
1997年 | 13篇 |
1996年 | 9篇 |
1995年 | 5篇 |
1994年 | 12篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1984年 | 3篇 |
1981年 | 3篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1971年 | 3篇 |
1970年 | 8篇 |
1968年 | 3篇 |
1966年 | 3篇 |
1963年 | 4篇 |
1948年 | 2篇 |
1947年 | 2篇 |
排序方式: 共有474条查询结果,搜索用时 15 毫秒
31.
J L Burton B W McBride B W Kennedy J H Burton T H Elsasser B Woodward 《Journal of animal science》1992,70(5):1488-1495
Recombinant bovine somatotropin (bST) was administered at 0, 10.3, or 20.6 mg per cow per day to 32 Holsteins for 38 wk. Fifteen currently treated cows had been treated in the previous lactation. Eighteen hematological variables and blood concentration of insulin-like growth factor I (IGF-I) were measured at five sample periods. The objectives of the study were to test the effects of bST treatments on hematological profiles and to relate blood IGF-I concentration to these variables. Results indicated little influence (P greater than .10) of previous bST treatments on hematological profiles measured in the current lactation. Current bST treatments, however, altered hematocrits (P = .10), mean corpuscular volume (P = .03), mean corpuscular hemoglobin (P = .009), and fraction of blood lymphocytes (P = .09). A week x bST treatment interaction also contributed to variation in hematocrit (P = .09), mean corpuscular hemoglobin (P = .05), fraction of neutrophils (P = .02), and fraction of lymphocytes (P = .04). Blood IGF-I concentration influenced fractions and counts of neutrophils (P = .06, .09), lymphocytes (P = .04, .02), and monocytes (P = .08, .05). Further in vivo and in vitro studies are warranted because this preliminary evidence suggests that bST and(or) IGF-I contribute to regulation of hematopoiesis in mature dairy cows. 相似文献
32.
33.
34.
35.
Recurrent flank alopecia is described in a 2-year-old, male, neutered Tibetan Terrier with concurrent atopic dermatitis. The diagnosis of recurrent flank alopecia was made after 3 consecutive years of localised, winter-onset alopecia. The diagnosis was based on history, compatible clinical signs and supportive histopathology. The diagnosis was complicated by the presence of concurrent pruritic dermatitis. To our knowledge this is the first report of recurrent flank alopecia in this breed. 相似文献
36.
Isolation of Western Equine Encephalomyelitis (Wee) Virus From Mosquitoes In Saskatchewan, 1962 总被引:1,自引:1,他引:0 下载免费PDF全文
J. Spalatin A. N. Burton J. McLintock R. Connell 《Canadian journal of veterinary research》1963,27(12):283-289
Saskatchewan, in the summer of 1962, was the scene of an extensive outbreak of western equine encephalomyelitis (WEE) in horses. The results of mosquito survey work showed Culiseta inornata and Culex tarsalis respectively to be the two most abundant mosquito species during midsummer. These species are those reported to be most commonly associated with outbreaks of WEE. Five hundred and sixty-four pools of mosquitoes were examined for the presence of WEE virus. Six pools, three of C. tarsalis and one each of C. inornata, Aedes flavescens and Aedes dorsalis, yielded WEE virus. Positive mosquitoes were from St. Walburg (C. inornata), Saskatoon (C. tarsalis — two, A. dorsalis — one), Outlook (C. tarsalis) and Kisbey (A. flavescens). 相似文献
37.
Dougherty MK Khurana KK Neubauer FM Russell CT Saur J Leisner JS Burton ME 《Science (New York, N.Y.)》2006,311(5766):1406-1409
The Cassini magnetometer has detected the interaction of the magnetospheric plasma of Saturn with an atmospheric plume at the icy moon Enceladus. This unanticipated finding, made on a distant flyby, was subsequently confirmed during two follow-on flybys, one very close to Enceladus. The magnetometer data are consistent with local outgassing activity via a plume from the surface of the moon near its south pole, as confirmed by other Cassini instruments. 相似文献
38.
Bee pollen product supplementation to horses in training seems to improve feed intake: A pilot study
Turner KK Nielsen BD O'Connor CI Burton JL 《Journal of animal physiology and animal nutrition》2006,90(9-10):414-420
The objective of this study was to determine the efficacy of supplementation of Dynamic Trio 50/50, a bee pollen-based product, to improve physical fitness, blood leukocyte profiles, and nutritional variables in exercised horses. Ten Arabian horses underwent a standardised exercise test (SET), then were pair-matched by sex and fitness and randomly assigned to BP (receiving 118 g of Dynamic Trio 50/50 daily) or CO (receiving 73 g of a placebo) for a period of 42 days. A total collection was conducted from days 18 to 21 on six geldings to determine nutrient retention and neutral detergent fibre (NDF) and acid detergent fibre (ADF) digestibility. Horses were exercise conditioned and completed another SET on day 42. V160 and V200 were calculated from SET heart rates (HR). Lactate, glucose, haematocrit (HT) and haemoglobin (HB) concentrations were determined from SET blood samples. Total leukocyte count, and circulating numbers of various leukocytes and IgG, IgM and IgA concentrations were determined in rest and recovery blood samples from both SETs. Geldings on BP (n = 3) ate more feed than CO. BP had less phosphorus excretion, and tended to retain more nitrogen. BP tended to digest more NDF and ADF while having lower NDF digestibility and tending to have lower ADF digestibility. No treatment differences existed for V160 and V200, HR, lactate, HT and HB. There was a trend for lymphocyte counts to be lower in BP than CO on day 42. Dynamic Trio 50/50 supplementation may have a positive effect on performance by helping horses in training meet their potentially increased nutrient demands by increasing feed intake and thus nutrient retention. 相似文献
39.
40.
Carissa Embury-Hyatt Rosemary Postey Tamiko Hisanaga Lynn Burton Kathleen Hooper-McGrevy Leanne McIntyre Kevin Millar John Pasick 《The Canadian veterinary journal. La revue veterinaire canadienne》2012,53(9):998-1002
In March 2011, rabbit hemorrhagic disease (RHD) was suspected in a 1-year-old male neutered lop-eared rabbit that had acute onset liver failure. Gross pathology, histopathology, immunohistochemistry, partial nucleic acid sequencing and phylogenetic analysis of the major capsid protein (VP60) and animal inoculation studies all supported this diagnosis making it the first confirmed case of RHD in Canada. 相似文献