全文获取类型
收费全文 | 71197篇 |
免费 | 3954篇 |
国内免费 | 1448篇 |
专业分类
林业 | 4597篇 |
农学 | 4021篇 |
基础科学 | 1388篇 |
9301篇 | |
综合类 | 11015篇 |
农作物 | 3013篇 |
水产渔业 | 3678篇 |
畜牧兽医 | 34325篇 |
园艺 | 1206篇 |
植物保护 | 4055篇 |
出版年
2022年 | 614篇 |
2021年 | 869篇 |
2020年 | 860篇 |
2019年 | 929篇 |
2018年 | 1288篇 |
2017年 | 1532篇 |
2016年 | 1464篇 |
2015年 | 1388篇 |
2014年 | 1549篇 |
2013年 | 2955篇 |
2012年 | 2547篇 |
2011年 | 2998篇 |
2010年 | 2231篇 |
2009年 | 2157篇 |
2008年 | 2767篇 |
2007年 | 2734篇 |
2006年 | 2619篇 |
2005年 | 2348篇 |
2004年 | 1992篇 |
2003年 | 1943篇 |
2002年 | 1856篇 |
2001年 | 2652篇 |
2000年 | 2435篇 |
1999年 | 2036篇 |
1998年 | 988篇 |
1997年 | 857篇 |
1996年 | 799篇 |
1995年 | 887篇 |
1994年 | 760篇 |
1993年 | 758篇 |
1992年 | 1406篇 |
1991年 | 1529篇 |
1990年 | 1550篇 |
1989年 | 1436篇 |
1988年 | 1322篇 |
1987年 | 1280篇 |
1986年 | 1189篇 |
1985年 | 1115篇 |
1984年 | 928篇 |
1983年 | 732篇 |
1982年 | 532篇 |
1979年 | 793篇 |
1978年 | 616篇 |
1976年 | 524篇 |
1974年 | 624篇 |
1973年 | 605篇 |
1972年 | 633篇 |
1971年 | 601篇 |
1970年 | 588篇 |
1969年 | 537篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
932.
Communities invest considerable resources to address the animal welfare and public health concerns resulting from unwanted pet animals. Traditionally, research in this area has enumerated the pet-owning population, described pet population dynamics in individual communities, and estimated national euthanasia figures. Recent research has investigated the human–animal bond and explored the community implications of managed feral cat colonies. These reports have utilized traditional epidemiologic study designs to generate observational data to describe populations and measure associations. However, rigorous scientific evaluations of potential interventions at the group level have been lacking. Group-randomized trials have been used extensively in public health research to evaluate interventions that change a population's behavior, not just the behavior of selected individuals. We briefly describe the strengths and limitations of group-randomized trials as they are used to evaluate interventions that promote social and behavioral changes in the human public health field. We extend these examples to suggest the appropriate application of group-randomized trials for pet population dynamics research. 相似文献
933.
Bacterial colonization affects early organ and gastrointestinal growth in the neonate 总被引:1,自引:0,他引:1
R.H. Siggers T. Thymann J.L. Siggers M. Schmidt A.K. Hansen P.T Sangild 《Livestock Science》2007,109(1-3):14-18
Enteral nutrition coupled with bacterial colonization has been shown to have major functional and developmental effects during the postnatal period of neonates. In this study, we developed a highly sensitive premature pig model to elucidate the specific developmental impact of initial bacterial colonization on premature neonates by comparing germ-free and conventionally reared pigs. Thirty-eight preterm pigs (93% gestation) were delivered via caesarean section and reared in either germ-free or conventional isolators for 40–48 h. Pigs were fed either infant milk formula or sow's colostrum. Enteral feeding for two days had trophic effects on gastrointestinal weights, particularly for pancreas, stomach and small intestine (SI). The absence of bacteria in formula fed pigs resulted in a mucosa that appeared more robust and had higher weights for both SI and pancreas, compared to conventional formula fed pigs (P < 0.05). Colostrum fed pigs also had markedly increased mucosal SI proportions, lung and spleen weights compared to conventional formula fed pigs. Colostrum fed pigs and germ-free pigs were similar although stomach, pancreas and distal SI weights were highest for germ-free pigs. The results demonstrate that the initial bacterial colonization interacts with diet to modulate the early neonatal organ development, particularly of the GIT. 相似文献
934.
Genetic and phenotypic parameters and annual trends for milk production and fertility traits of the Sahiwal cattle in semi arid Kenya 总被引:1,自引:0,他引:1
Data comprising 7211 lactation records of 2894 cows were used to estimate genetic and phenotypic parameters for milk production
(lactation milk yield, LMY and lactation length, LL) and fertility (calving interval, CI; number of services per conception,
NSC and age at first calving, AFC) traits. Genetic, environmental and phenotypic trends were also estimated. Variance components
were estimated using univariate, bivariate and trivariate animal models on based restricted maximum likelihood procedures.
Univariate models were used for each trait, while bivariate models were used to estimate genetic and phenotypic correlations
between milk production and fertility traits and between LMY, LL, CI and NSC within each lactation. Trivariate models were
used in the analysis of LMY, LL, CI and NSC in the first three lactations. Heritability estimates from the univariate model
were 0.16, 0.07, 0.03, 0.04 and 0.01 for LMY, LL, CI, AFC and NSC, respectively. The heritability estimates from trivariate
analysis were higher for milk production traits than those from univariate analyses. Genetic correlations were high and undesirable
between milk production and fertility traits, while phenotypic correlations were correspondingly low. Genetic trends were
close to zero for all traits, while environmental and phenotypic trends fluctuated over the study period. 相似文献
935.
Nemcová R Bomba A Gancarcíková S Reiffová K Guba P Koscová J Jonecová Z Sciranková L Bugarský A 《Veterinary research communications》2007,31(7):791-800
The influence of the administration of Lactobacillus plantarum, maltodextrin Maldex 150 and Raftifeed IPX fructooligosaccharides on the inhibition of adhesion of E. coli O8:K88 to the mucosa of the jejunum, ileum and colon as well as on the organic acid levels was investigated in 33 conventional
piglets. The counts of E. coli K88 adhering to the jejunal mucosa were significantly decreased (p < 0.05) in Lact. plantarum + Maldex 150 and Lact. plantarum + Maldex 150 + Raftifeed IPX groups. The counts of E. coli K88 adhering to the colonic mucosa of Lact. plantarum + Maldex 150 + Raftifeed IPX and Lact. plantarum + Raftifeed IPX groups were significantly lower (p < 0.05) than in Lact. plantarum and Lact. plantarum + Maldex 150 animals. The acetic acid levels in the ileum and colon of the Lact. plantarum + Maldex 150 + Raftifeed IPX group and Lact. plantarum + Raftifeed IPX group were significantly higher (p < 0.05) than in the Lact. plantarum and Lact. plantarum + Maldex 150 group. The combination of Lact. plantarum, maltodextrin Maldex 150 and Raftifeed IPX proved to be the most effective one to inhibit the counts of E. coli O8:K88 adhering to the intestinal mucosa of the jejunum and colon of conventional piglets. 相似文献
936.
937.
S.J. Ruff BS C.H. Wood PhD D.K. Aaron PhD L.M. Lawrence PhD 《Journal of Equine Veterinary Science》1993,13(10)
The objectives of this study were to compare the growth rates of normal thoroughbred foals to previously reported growth rates1 and to compare growth rates of normal foals with foals diagnosed with cervical vertebral malformation (CVM). Fifty-six foals from two foals crops were used, and eight of these foals were diagnosed with CVM. Growth rate analysis of the CVM foals had to be restricted to the period prior to diagnosis because once these foals were diagnosed, they were treated differently from the normal foals. Body measurements taken at 7 day intervals were body weight, wither height, hip height, and heart girth. For statistical analysis, data were broken down into 30 day intervals. Results showed that the growth rates for normal thoroughbred foals have not changed in the past fifteen years. The CVM foals tended to be heavier and taller during some time intervals than the normal foals, but there were no significant differences between the two groups in any of the skeletal growth measurements. Body weight gain was faster in CVM foals from 31–60 d (p<.01), 121–150 d (p<.01), and 211–240 d (P –.05). 相似文献
938.
Local anaesthetic techniques and diagnostic imaging tools are currently used in conjunction with thorough physical and lameness examinations to diagnose sacroiliac disease (SID) in the horse. The deep and inaccessible location of the sacroiliac joint (SIJ), however, often renders diagnostic imaging modalities, such as radiography, nuclear scintigraphy and ultrasonography, unreliable in identifying sacroiliac problems. The equine clinician therefore often has to rely on positive results of local anaesthetic techniques to confirm a diagnosis of SID. Regional infiltration techniques have been described but result in a diffuse distribution of large volumes of local anaesthetic solution throughout the entire lumbosacroiliac region, which is nonspecific to the SIJ and has the potential to produce false positive results. Several periarticular injection approaches to the SIJ have recently been described. A combination of periarticular SIJ injections with the use of modest amounts of local anaesthetic solution provides increased SIJ specificity, but may lead to false negative results in cases where the pain originates from surrounding soft tissues. This article clarifies terminology related to sacroiliac injections, reviews current injection techniques, highlights the advantages and disadvantages of each approach, and investigates injectate volume considerations. 相似文献
939.
940.
Canine conjunctival papilloma: A review of five cases 总被引:1,自引:0,他引:1