全文获取类型
收费全文 | 719篇 |
免费 | 56篇 |
国内免费 | 1篇 |
专业分类
林业 | 16篇 |
农学 | 23篇 |
基础科学 | 3篇 |
52篇 | |
综合类 | 134篇 |
农作物 | 21篇 |
水产渔业 | 35篇 |
畜牧兽医 | 459篇 |
园艺 | 5篇 |
植物保护 | 28篇 |
出版年
2023年 | 5篇 |
2021年 | 6篇 |
2020年 | 10篇 |
2019年 | 15篇 |
2018年 | 12篇 |
2017年 | 7篇 |
2016年 | 11篇 |
2015年 | 10篇 |
2014年 | 9篇 |
2013年 | 30篇 |
2012年 | 15篇 |
2011年 | 21篇 |
2010年 | 27篇 |
2009年 | 18篇 |
2008年 | 16篇 |
2007年 | 34篇 |
2006年 | 34篇 |
2005年 | 34篇 |
2004年 | 22篇 |
2003年 | 24篇 |
2002年 | 29篇 |
2001年 | 23篇 |
2000年 | 20篇 |
1999年 | 20篇 |
1998年 | 16篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 10篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 22篇 |
1991年 | 16篇 |
1990年 | 12篇 |
1989年 | 16篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 7篇 |
1985年 | 14篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1980年 | 5篇 |
1979年 | 9篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1973年 | 6篇 |
1971年 | 10篇 |
1970年 | 4篇 |
1969年 | 5篇 |
1914年 | 4篇 |
1902年 | 4篇 |
排序方式: 共有776条查询结果,搜索用时 531 毫秒
101.
The energy requirements of pregnant, lactating and non-reproductive Praomys natatensis and Saccostomus campestris were studied in metabolism cages and respirometers. Ingestion rate during pregnancy and lactation was not increased significantly in either species. P. natatensis and S. campestris showed non-significant increases in respiratory rate during pregnancy (18% and 55% respectively) but significant increases in oxygen consumption during lactation (79% and 110% respectively). The results highlight the need for studies quantifying lipid and protein flux during pregnancy and lactation, since quantifying energy turnover alone is inadequate and misleading. The energetic costs of reproduction are discussed in relation to previous studies. 相似文献
102.
Genetically engineered (GE) animals are likely to have an important role in the future in meeting the food demand of a burgeoning global population. There have already been many notable achievements using this technology in livestock, poultry and aquatic species. In particular, the use of RNA interference (RNAi) to produce virus‐resistant animals is a rapidly‐developing area of research. However, despite the promise of this technology, very few GE animals have been commercialised. This review aims to provide information so that veterinarians and animal health scientists are better able to participate in the debate on GE animals. 相似文献
103.
104.
The prevalence of Mycoplasma ovipneumoniae and Mycoplasma arginini in the respiratory tract of sheep
M.R. Alley B.V.Sc. Janet R. Quinlan B.Sc. J.K. Clarke B.Sc. Ph.D. 《New Zealand veterinary journal》2013,61(7):137-141
Abstract Extract In an initial study of mycoplasmas of the respiratory tract of New Zealand sheep a number of strains of mycoplasma were recovered and identified as either M. ovipneumoniae or M. arginini (Clarke et al., 1974). Investigations in Australia have produced evidence that M. ovipneumoniae is associated with a proliferative interstitial pneumonia in Queensland sheep (Sullivan et al., 1973) and for this reason the present survey was undertaken to investigate the prevalence of mycoplasmas in the respiratory tract of sheepin New Zealand. 相似文献
105.
We have tested the hypothesis "that the ovulation rate in homozygous carriers (BB) and noncarriers (+2) of the Booroola FecB gene would not be different if the plasma concentrations of follicle-stimulating hormone (FSH) in the two genotypes were similar." For this purpose we used two experimental animal models: 1) the hypothalamic-pituitary disconnected (HPD) ovary-intact ewe; and 2) and GnRH agonist (i.e., Deslorelin)-treated ewe. Following HPD or Deslorelin treatment, the animals had low plasma concentrations of gonadotropins and were anovulatory. In both animal models, BB and +2 ewes were treated with exogenous pregnant mares serum gonadotropin (PMSG) and varying doses of FSH to induce preovulatory follicular growth, and human chorionic gonadotropin (hCG) to induce ovulation. HPD or Deslorelin-treated animals administered with pregnant mares serum gonadotropin without FSH followed by human chorionic gonadotropin failed to ovulate. However for both animal models, the proportion of BB and +2 ewes ovulating to various doses of FSH differed such that significantly greater proportions of +2 animals ovulated relative to the BB genotype (P < 0.05). When HPD or Deslorelin-treated BB and +2 ewes were administered identical doses of FSH, the mean ovulation rate and plasma concentrations of FSH in those animals which ovulated was the same in both genotypes. These findings confirm, at least in part, the aforementioned hypothesis. The results also demonstrated that higher ovulation rates were obtained in both genotypes as the FSH dose was increased. Collectively, these findings infer that the higher mean ovulation rate in normal intact BB ewes compared to the +2 genotype is attributable to effects of the FecB gene at the level of ovarian follicular development as well as at the level of pituitary FSH release. 相似文献
106.
Mitchell John Tulau Sally K. McInnes‐Clarke Xihua Yang Robin A. McAlpine Senani B. Karunaratne Qinggaozi Zhu David T. Morand 《Soil Use and Management》2019,35(1):63-74
The impacts of a wildfire and subsequent rainfall event in 2013 in the Warrumbungle National Park in New South Wales, Australia were examined in a project designed to provide information on post‐fire recovery expectations and options to land managers. A coherent suite of sub‐projects was implemented, including soil mapping, and studies on soil organic carbon (SOC) and nitrogen (N), erosion rates, groundcover recovery and stream responses. It was found that the loss of SOC and N increased with fire severity, with the greatest losses from severely burnt sandstone ridges. Approximately 2.4 million t of SOC and ~74,000 t of N were lost from soil to a depth of 10 cm across the 56,290 ha affected. Soil loss from slopes during the subsequent rainfall event was modelled up to 25 t ha?1, compared to a long‐term mean annual soil loss of 1.06 t ha?1 year?1. Groundcover averages generally increased after the fire until spring 2015, by which time rates of soil loss returned to near pre‐fire levels. Streams were filled with sand to bank full levels after the fire and rainfall. Rainfall events in 2015–2016 shifted creek systems into a major erosive phase, with incision through the post‐fire sandy bedload deposits, an erosive phase likely related to loss of topsoils over much of the catchment. The effectiveness of the research was secured by a close engagement with park managers in issue identification and a communications programme. Management outcomes flowing from the research included installation of erosion control works, redesign of access and monitoring of key mass movement hazard areas. 相似文献
107.
AIMS: To establish the incidence, frequency and type of deliberate animal abuse seen in veterinary practice in New Zealand, and ascertain veterinarians' knowledge of human abuse within the families where animal abuse was occurring. To explore attitudes of veterinarians to and knowledge about the correlation between animal abuse and human violence, and their perceived role in dealing with such issues. METHODS: A postal questionnaire was sent to practising veterinarians in New Zealand. It covered demographics, frequency and type of animal abuse cases seen, awareness of violence towards humans, within families where animal abuse was seen, the methods used for managing animal and human abuse, the incidence of psychological abuse of animals, and the attitudes of veterinarians towards and their beliefs about the link between animal abuse and human violence. RESULTS: A total of 383/1,412 (27% response rate) questionnaires with useable data were returned. Within the group of respondents, the sexes were evenly represented; 40% of respondents worked in small-animal practice, 50% in mixed practice and 10% in large-animal practice. Deliberate animal abuse had been seen by 63% of respondents in the last 5 years; 37% of these had seen such cases once a year or less, while 9% had seen abuse cases at least four times a year. Dogs were the species most commonly reported as abused, followed, in numerical order, by cats, cattle and horses. Among respondents who had seen deliberate animal abuse, 16% either knew of (4%) or suspected (12%) human abuse within the families of the abused animals. A clear majority of responding veterinarians agreed with the statement that people who abuse their animals are more likely to abuse their children (77%) or spouse (70%). CONCLUSIONS: The survey indicated that the majority of respondents had seen cases of animal abuse within the previous 5 years, and dogs were the species most often reported abused. Responding veterinarians felt a strong ethical duty to deal with cases of animal abuse, but they were less comfortable about issues of human abuse, even though the awareness of the link between abuse of animals and abuse of humans was relatively high. CLINICAL RELEVANCE: The greater the awareness of animal abuse and its linkage with human abuse, the greater the possibility that veterinarians can contribute in a meaningful way to the reduction of violence in society. 相似文献
108.
109.
Evaluation of the placement and maintenance of central venous jugular catheters in critically ill dogs and cats
下载免费PDF全文
![点击此处可从《Journal of Veterinary Emergency and Critical Care》网站下载免费的PDF全文](/ch/ext_images/free.gif)
110.