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1.
正中国农业科学院蜜蜂研究所传粉蜂生物学与授粉应用团队在梨树蜜蜂授粉技术方面取得新进展,首次分析了我国酥梨花蜜的蔗糖、果糖和葡萄糖含量,并探明中华蜜蜂和意大利蜜蜂采集梨树的活动规律,获得两种蜜蜂采集偏好差异,为今后梨树应用蜜蜂授粉奠定了基础。相关研究成果在美国昆虫学会杂志《Journal of Economic Entomology》2017年第6期上发表。  相似文献   

2.
为了解散尾葵(Dypsis lutescens)花蜜的糖含量和蜜蜂访花情况,在南宁市区对园林单位种植的散尾葵进行调查,了解其形态特征、开花习性、花蜜糖含量、访花蜜蜂种类以及蜜蜂访花行为等。结果表明,散尾葵花期为5～6月,花粉和花蜜丰富,花蜜的糖含量为10.0%～45.0%,中蜂访花积极,是一种具有较高养蜂利用价值的蜜粉源植物。  相似文献   

3.
云南省于1958年开始引种商山酥梨,目前滇中地区种植面积达14666．67hm2。砀山酥梨需异花授粉,近年因授粉不良等原因,致使产量下降、品质变劣。1998年3月在云南农业大学农场砀山酥梨园和安宁市一砀山酥梨园,以滇中常见的13个梨品种作授粉树,进行人工授粉,果实自然成熟时测定品质,以便为砀山酥梨配置授粉树提供依据。试验结果如下。砀山酥梨以秦丰、富源黄梨、金水1号、早酥、金花、鲁沙梨、金水3号、雪花、苍溪雪梨、鸭梨、秦酥、贵妃梁和火把梨为授粉树,平均单果重分别为203．0、333.3、195．8、205．4、395．0、375．6、398．3、22…  相似文献   

4.
紫花苜蓿Medicago sativa自花授粉率低,利用传粉昆虫辅助授粉紫花苜蓿是提高单位面积种子产量和经济效益的有效途径。高加索蜜蜂Apis mellifera饲养管理方便、技术成熟、成本低。试验研究了高加索蜜蜂对俄罗斯紫花苜蓿授粉效果,结果表明：高加索蜜蜂吻特长,达7.2 mm,每日访花始期为9：00,访花高峰期为12：00,访花结束期为18：00。访花适宜气温为1525 ℃,访花速度为3040朵/min,日平均访花次数为1.98万2.64万朵/只。高加索蜜蜂授粉俄罗斯紫花苜蓿的有效放蜂容量为125 000只/hm2以上（6个以上强群高加索蜜蜂）,俄罗斯紫花苜蓿最高表现种子产量为1 067.6 kg/hm2。  相似文献   

5.
近期,由安徽省绿化委员会上报,宿州市推荐的砀山县"梨树王"入选《中国人文古树大观》。砀山"梨树王"为砀山酥梨,位于砀山县良梨小镇核心区,树高6.5 m,着生9大主枝,分枝100余条,主干直径3.48 m,冠幅16 m。近年来,该小镇科技人员对这株梨树采取数字化管理、修剪老弱枝条、测土配方施肥、生物防治病虫害等措施。目前,这株梨树枝繁叶茂,株产2000 kg,产值超万元。2014年"梨树王"入选安徽省"名木古树",由安徽省人民政府挂牌保护;=.  相似文献   

6.
正随着风速的增加,工蜂访花次数减少,采集效率降低。苏塞克斯大学的研究人员表示,采集活动减少的原因是随着风速的增加,蜜蜂越来越不愿意起飞。花朵在风中的摆动似乎不是原因。  相似文献   

7.
日前,笔者从砀山县农业农村局获悉,农业农村部近期公布了2021中国美丽休闲乡村名单。经过各省遴选推荐,专家评审和网上公示,全国254个乡村被确定为2021年中国美丽休闲乡村,砀山县良梨镇良梨村入选。该村位于砀山县良梨镇的核心区,是砀山酥梨的发源地和原产区,也是砀山酥梨文化的发祥地,以生产优质酥梨闻名。该村拥有国家4A级梨树王风景区,300多年生“梨树王”是全国最美树王之一。  相似文献   

8.
正蜜蜂是自然界中最理想的授粉昆虫之一,具有采集力强、授粉范围大、访花次数多和不受花朵位置影响等优势,能有效提高农作物的结实率,降低农产品畸形的发生比例,提高农作物的产量与质量~([1])。加快推广蜜蜂授粉技术对促进农业增产增收、减少农产品化学污染、维护生物多样性和保护生态环境  相似文献   

9.
薛承坤 《蜜蜂杂志》2009,29(12):28-28
德国科学家发现,蜜蜂采集花蜜的过程不仅起到帮植物传播花粉、繁殖后代的作用,而且还起到植物＂贴身侍卫＂的作用,保护花朵免遭其它噬花类小昆虫的袭击。  相似文献   

10.
昆虫在访花过程中,同时为植物传粉,这无疑对植物的繁殖起着极重要的作用。依靠昆虫传粉的植物比较多,即所谓“虫媒花。它们为了适应昆虫的传粉,花朵往往有种种巧妙的构造。一般,植物常用颜色、花蜜和花粉来吸引昆虫。当昆虫擦过花朵中生长花粉的器官时,身上就沾满花粉,同时把花粉带到另外一株同种的花上。蜜蜂中的工蜂,遍身长着沾花粉的葺毛,腿上的梳状结构把身上的花粉移到后腿上的花粉篮里。它们就是依靠这些进行传粉的。有一种山月桂花的受粉部分,生长得非常巧妙,只要蜜蜂来访,几乎可以保证完成异花传粉。因为山月桂花具有碗形的花朵,  相似文献   

11.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

12.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

13.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

14.
Tropical Animal Health and Production -  相似文献   

15.
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.  相似文献   

16.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

17.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

18.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
  相似文献   

19.
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed.  相似文献   

20.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb albumin - ALT alanine aminotransferase - AST aspartate aminotransferase - BUN blood urea nitrogen - Chol cholesterol - Glob globulin - -GT -glutamyl transpeptidase - IP inorganic phosphorus - TP total protein  相似文献   

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