全文获取类型
收费全文 | 66篇 |
免费 | 0篇 |
专业分类
林业 | 1篇 |
农学 | 5篇 |
基础科学 | 1篇 |
15篇 | |
综合类 | 1篇 |
农作物 | 4篇 |
畜牧兽医 | 36篇 |
植物保护 | 3篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2020年 | 8篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 7篇 |
2011年 | 3篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 2篇 |
2003年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1993年 | 2篇 |
1987年 | 1篇 |
排序方式: 共有66条查询结果,搜索用时 0 毫秒
51.
52.
Shimelis Dagnachew Melkamu Bezie Getachew Terefe Getachew Abebe J. David Barry Bruno M. Goddeeris 《Acta veterinaria Scandinavica》2015,57(1)
Background
Ethiopia, particularly in the Northwest region, is affected by both tsetse and non-tsetse fly transmitted trypanosomosis, with significant impact on livestock productivity. The aim of this study was to determine and compare clinical findings and haematological values between experimental infections induced by Trypanosoma vivax isolates from areas of either transmission mode. Sixteen young (aged between 6 and 12 months) Zebu cattle (Bos indicus), purchased from a trypanosome-free area and confirmed to be trypanosome-negative, were randomly assigned into four groups of four animals. Groups 1, 2 and 3 were infected with an isolate from a tsetse infested or one of two isolates from a non-tsetse infested area, and group 4 was a non-infected control. All animals in the infected groups were inoculated intravenously with 2 × 106 trypanosomes from donor animals. The experimental animals were monitored for eight consecutive weeks post infection for clinical signs, parasitaemia and haematological changes in packed cell volume (PCV), haemoglobin concentration (Hgb), total red blood cell (RBC) and white blood cell (WBC) counts, differential WBC count and blood indices (mean corpuscular volume [MCV], mean corpuscular haemoglobin and mean corpuscular haemoglobin concentration).Results
Infection was characterized by reduced feed intake, weakness, pyrexia, parasitaemia, rough hair coat, enlarged prescapular lymph nodes, lacrimation, weight loss, pallor mucus membrane and dehydration. Body weight loss in all infected groups was significantly higher than in the non-infected control. Similarly, body weight loss was higher (P < 0.001) in animals infected with the tsetse infested isolate than with the non-tsetse infested isolates. The mean PCV, Hgb, total RBC and WBC counts were lower (P < 0.001), and mean MCV was higher (P = 0.01) in all infected groups than in non-infected control animals at different time points during the study period. Except for minor variations in haematological values, the overall changes were similar in all infected groups.Conclusion
Clinical signs and significant reduction in haematological values in the infected groups indicated the pathogenicity of the T. vivax parasites. Pathogenicity of T. vivax from the non-tsetse infested area can be considered as nearly as important as that of its counterpart derived from the tsetse infested area. 相似文献53.
Typhlocolitis was diagnosed in 40 aged donkeys at routine post mortem examinations subjected to euthanasia for colic‐related clinical signs at The Donkey Sanctuary. Gross pathological changes included oedema, ulceration and haemorrhage involving the caecum and ventral colon. Histopathology indicated endoparasite and bacterial associated inflammation in 20 and 11 cases, respectively. Bacterial culture in 18 cases did not yield a definite aetiological agent. Other management and stress related factors were looked at to identify obvious risk factors. This report describes the clinical, biochemical and haematological parameters and pathological changes observed in 40 donkeys diagnosed with typhlocolitis. 相似文献
54.
G Tizazu O el Zubir S Patole A McLaren C Vasilev DJ Mothersole A Adawi CN Hunter DG Lidzey GP Lopez GJ Leggett 《Biointerphases》2012,7(1-4):54
Exposure of films formed by the adsorption of oligo(ethylene glycol) (OEG) functionalized trichlorosilanes on glass to UV light from a frequency-doubled argon ion laser (244 nm) causes photodegradation of the OEG chain. Although the rate of degradation is substantially slower than for monolayers of OEG terminated thiolates on gold, it is nevertheless possible to form micrometer-scale patterns by elective adsorption of streptavidin to exposed regions. A low density of aldehyde functional groups is produced, and this enables derivatization with nitrilotriacetic acid via an amine linker. Complexation with nickel enables the site-specific immobilization of histidine-tagged yellow and green fluorescent proteins. Nanometer-scale patterns may be fabricated using a Lloyd's mirror interferometer, with a sample and mirror set at right angles to each other. At low exposures, partial degradation of the OEG chains does not remove the protein-resistance of the surface, even though friction force microscopy reveals the formation of patterns. At an exposure of ca. 18 J cm(-2), the modified regions became adhesive to proteins in a narrow region ca. 30 nm (λ/8) wide. As the exposure is increased further the lines quickly broaden to ca. 90 nm. Adjustment of the angle between the sample and mirror enables the fabrication of lines of His-tagged green fluorescent protein at a period of 340 nm that could be resolved using a confocal microscope. 相似文献
55.
56.
Tesema Zeleke Alemayehu Kefyalew Getachew Tesfaye Kebede Damitie Deribe Belay Taye Mengistie Tilahun Mekonnen Lakew Mesfin Kefale Alemu Belayneh Negus Zegeye Asres Yizengaw Liuel 《Tropical animal health and production》2020,52(6):3195-3205
Tropical Animal Health and Production - Accurate performance evaluation and genetic parameters estimation are the prerequisites for any successful genetic improvement program. This study was... 相似文献
57.
Getachew Tesfaye Abebe Ayele Gizaw Solomon Rischkowsky Barbara Bisrat Asfaw Haile Aynalem 《Tropical animal health and production》2020,52(6):2977-2985
Tropical Animal Health and Production - In the traditional Menz sheep breeding, communities select against black coat color and therefore its frequency is declining over time. We hypothesize that... 相似文献
58.
The study was undertaken to determine the prevalence of bovine mastitis, isolate mastitis causing bacteria, assess the association of some risk factors, and determine the antibiotic resistance pattern of bacterial isolates in cows in large-scale dairy farms of Northern Ethiopia. A total of 305 lactating and nonlactating cows were included in the present study. The overall prevalence of clinical and subclinical mastitis was 3.6 and 33.8?%, respectively. The quarter level prevalence was 15.4?%; from which, 11.9 and 1.1?% were subclinical form and blind teat, respectively, while the remaining 2.4?% were of clinical form. Staphylococcus aureus accounted for 36?% of the isolates followed by Escherichia coli (27.3?%). Risk factors including age (p?0.001), parity (p?0.001), and lactation stage (p?=?0.02) showed significant association with the occurrence of mastitis. Higher prevalence was observed in both groups of older cows (i.e., 6-9?years (odds ratio (OR)?=?4.65, 95?% confidence interval (CI)?=?2.74-7.89) and >9?years (OR?=?3.63, 95?% CI?=?1.42-9.25)), cows with four to seven calves (OR?=?3.39, 95?% CI?=?2.06-5.60), and cows in late lactation stage (OR?=?3.79, 95?% CI?=?1.64-8.75). In multivariable logistic regression analysis, age (p?=?0.005) and lactation stage (p?=?0.027) showed statistically significant association with the occurrence of mastitis. The antimicrobial susceptibility pattern showed high susceptibility of S. aureus to nalidixic acid (82.4?%) followed by chloramphenicol (58.8?%); however, these species were resistant to the rest of the antimicrobials tested. Highest resistance was observed against clindamycin and ampicillin. Coliform bacteria (E. coli and Klebsiella pneumoniae) showed resistance to most of the antimicrobials used. Detailed investigation is needed to identify the interplay of managemental and environmental risk factors to design appropriate control measures. 相似文献
59.
Kumsa B Tamrat H Tadesse G Aklilu N Cassini R 《Tropical animal health and production》2012,44(1):119-124
A cross-sectional study was conducted to determine the species composition and prevalence of ixodid ticks infesting horses
in three agroecological zones in central Ethiopia. For this purpose, a total of 1,168 horses were examined for tick infestation.
An overall prevalence of 39.04% of tick infestation on horses was recorded. A total of 917 adult ticks were collected from
infested horses. Amblyomma, Boophilus, Rhipicephalus, and Hyalomma genera with the respective prevalence of 3.2%, 1.8%, 29.2%, and 4.7% were identified. In the study, Rhipicephalus evertsi evertsi was encountered with the highest prevalence (15.8%) whereas Amblyomma gemma was with lowest prevalence (1.5%). From the highland, Hyalomma marginatum rufipes (3.1%), Hyalomma truncatum (1.0%), and Boophilus decoloratus (0.3%) were identified. From the midland, R. evertsi evertsi (27.5%), Rhipicephalus pulchellus (18%), Amblyomma variegatum (3.6%), B. decoloratus (2.8%), H. marginatum rufipes (2.6%), H. truncatum (1.8%), and A. gemma (1.5%) were identified. R. evertsi evertsi, 107 (27.5%), was with the highest prevalence in the midland. From the lowland, R. pulchellus (22.3%), R. evertsi evertsi (20%), H. truncatum (3.6%), A. gemma (3.1%), B. decoloratus (2.3%), H. marginatum rufipes (2.1%), and A. variegatum (1.5%) were identified. In the lowland, R. pulchellus, 87 (22.3%), was the most abundant tick species. The overall prevalence of tick infestation on horses was significantly (P < 0.05) higher both in the midland, 225 (57.8%), and the lowland, 214 (54.87%), than the highland, 17 (4.4%). This suggests
that horses in midland and lowland are at higher risk of tick infestation than those horses in the highland. Further studies
on the role of ticks in transmission of diseases to equines and the importance of horses as alternative hosts in different
parts of Ethiopia are needed. 相似文献
60.
A study was conducted for two consecutive years (1998–1999) to determine the seasonal patterns of strongyle infection in working
donkeys of Ethiopia. For the purpose 2385 donkeys from midland and lowland areas were examined for the presence of parasitic
ova. A hundred percent prevalence of strongyle infection with similar seasonal pattern of strongyle faecal worm egg output
was obtained in all study areas. However, seasonal variations in the number of strongyle faecal worm egg output were observed
in all areas. The highest mean faecal worm egg outputs were recorded during the main rainy season (June to October) in both
years in all areas. Although an increase in the mean strongyle faecal egg output was obtained in the short rainy season (March–April)
followed by a drop in the short dry season (May), there was no statistically significant difference between the short rainy
season and long dry season (Nov–Feb) (P > 0.05). A statistically significant difference however, was obtained between the
main rainy season and short rainy season, and between the main rainy season and dry season (P < 0.05). Based on the results
obtained it is suggested that the most economical and effective control of strongyles can be achieved by strategic deworming
programme during the hot dry pre-main rainy season (May), when the herbage coverage is scarce and helminthologically ‘sterile’,
and the arrested development of the parasites is suppose to be terminating. This could insure the greatest proportion of the
existing worm population to be exposed to anthelmintic and also reduces pasture contamination and further infection in the
subsequent wet season. 相似文献