共查询到20条相似文献，搜索用时 312 毫秒
1.
‘NH003’是从湖北宜昌野生软枣猕猴桃资源中选育出的软枣猕猴桃雄性优系。该优系树势强,花枝率96%,花白绿色,呈多歧聚花序;花冠直径2.4cm;花瓣5瓣,基部分离;花柄长2.9cm,萼片5~6枚,绿色;花粉萌发率为56.1%。染色体倍性为四倍体。对软枣猕猴桃品种‘金香红’授粉坐果率高,果实品质优良。在武汉市,‘NH003’在3月上旬萌芽,4月下旬开花,花期长9-12d,能够覆盖本地早熟软枣猕猴桃雌性品种（‘红宝石星’、‘金香红’和‘金红贝’等）的开花期。 相似文献
2.
经过连续三年观察试验研究，从10个参试雄株中初选出了美味猕猴桃雄性株系3222，该雄株初花期较金魁早1-2天，盛花期与金魁猕猴桃相当，花期长达7天以上，花量大、花粉多、花粉萌发率高、与金魁授粉后获得的果实大、外观美、品质优，是“金魁”猕猴桃的初选适配授粉雄株。 相似文献
3.
银杏是雌雄异株风媒花植物 ,雌花必须经过授粉受精才能结实。银杏自然授粉受到多种因素的制约 ,如雌雄树花期是否相遇 ,雌雄树比例是否恰当花期天气是否适宜等 ,因而生产中往往自然授粉效果不佳 ,产量低而不稳。银杏人工授粉能显著提高银杏产量 ,达到丰产稳产目的。笔者 10多年来总结了一套人工授粉方法 ,供大家参考。1 采集优质花粉 银杏雄树较雌树开花早。一般年份灵川县的银杏雄树盛花期早花品种为 4月 1— 4日 ,中花品种为4月 4— 8日 ,迟花品种为 4月 9— 13日。采集花粉充分成熟的雄花序 ,其标志是由青色转为淡黄色 ,能见到少量的… 相似文献
4.
以红肉枇杷‘早钟六号’为母本、‘东湖早’为父本进行等量花粉混合授粉，从而获得大量F1代杂种，从中选育获得优质早熟白肉枇杷品种 ‘榕早3号’（系谱代号：ZDF1-3）。其主要特征为：果实椭圆形，果皮淡黄色，果肉黄白色，肉质细嫩，味浓甜，有香气，较易剥皮。母树和子代历年种植结果显示，优株‘榕早3号’的无性后代保持了母树优良性状，丰产性表现稳定，平均单果重51.2g，纵径4.99cm，横径4.48cm，果形指数1.11，可溶性固形物含量13.8%，可滴定酸含量为0.16%，固酸比84.7，每个果实有果核4.18枚，可食率72.6%，成熟期在4月上旬至4月中旬。与亲本‘早钟6号’相比，‘榕早3号’具早熟早产、丰产稳产、果大味甜等优点。经所在省市专家现场多次检测，优株‘榕早3号’表现突出，现已在福州、莆田、泉州等地进行中试。 相似文献
5.
6.
以早熟龙眼品种(桂冠早，暂定名)、中熟龙眼品种(石硖)、晚熟龙眼品种(桂明一号)为研究对象，观测并分析3个不同熟期龙眼品种开花习性和果实生长及落果规律，为早熟新品种桂冠早的审定工作及后期推广奠定基础。结果表明:桂冠早雌雄比为1：1.69，比石硖和桂明1号多两倍，且桂冠早雌雄花开放动态曲线表现出同步性,相遇期长达14天，而石硖和桂明1号雌雄花开放错开，石硖相遇期为12天，而桂明一号相遇期仅8天，树体不同方位雌雄开放规律性不强；果实发育第二阶段(假种皮发育期)桂冠早果实相对生长速率较快，生长周期仅77天；三个龙眼品种落果率均集中在花后前三周，桂冠早累积落果率达71.05%，且采前1个月日均至少有1个果实脱落；桂冠早和桂明1号果个较大与其库强和库活性较大有关;石硖属于高糖小果型，桂明1号属于低糖大果型，桂冠早属于高糖中果型。 相似文献
7.
【目的】为探寻红阳、贵长猕猴桃的高效授粉时间,应对优质授粉雄株与待授雌株花期不遇问题。【方法】分别于一日内不同时间及不同开花天数,用联苯胺-过氧化氢法测试红阳与贵长的柱头可授性。用流式细胞仪检测授粉雄株倍性。离体培养法检测授粉雄株花粉活力。【结果】红阳和贵长整个花期内柱头均有可授性,红阳和贵长均在开花第一天和第二天柱头可授性较强,一天内红阳11:00-16:00,贵长09:00-16:00柱头可授性较强。4种花粉在-80℃干燥保存一年后花粉活力(49.6%-70.1%)可满足猕猴桃生产需求。【结论】红阳和贵长整个花期内柱头均有可授性,可在花开较多时,集中在11：00-16:00对红阳授粉,09:00-16:00对贵长授粉,不必频繁授粉。花粉在-80℃干燥保存,可用于次年授粉以应对雌雄花期不遇问题。 相似文献
8.
为明确耐热型西番莲品种‘钦蜜9号’花器官发育进程特性和繁育系统类型,测定其花器官表型性状、花粉活性、柱头可授性、杂交指数和花粉/胚珠比。结果发现,‘钦蜜9号’花器官发育进程可分为：现蕾期-花冠发育期-雌雄蕊发育期-裂蕾期-开花授粉期-谢花期,时间持续25-27d,开花时间为下午13︰00-15︰00,单花开放时长约24 h,开花前3 d左右（花药即将开裂时）至裂蕾时柱头可授性最强;花粉数量为7.94x105个/花药,活性为90.11%,繁育系统类型为异交型,自交亲和,异交需要传粉者。这些特征为‘钦蜜9号’在35℃以上高温还能正常开花并结实提供了重要的基础条件。 相似文献
9.
以我国江西省抚州市南城县麻姑山的野生毛花猕猴桃雄株为材料，对其花粉活力进行测定。结果表明，供试的16个不同雄株的花粉活力之间存在显著差异，其中No.14、No.8和No.12活性分别为88.87％、87.80％和82.80％，均显著高于其他13个雄株。活性大于50％的雄株有No.13、9、16、4，它们的活性依次递减；而活性小于50％的雄株有No.6、1、2、15、5、11、3、10、7，其活性依次降低；No.10与No.7花粉活性最弱，分别为20.53％和16.72％，显著低于其他雄株。花粉活性的测定与比较可为毛花猕猴桃优良授粉品种的选择提供参考。 相似文献
10.
11.
试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。 相似文献
12.
Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections
of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal
(GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April
2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs
located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming
areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology
laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum
columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying
degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal
abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy
season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different
nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those
observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes.
But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the
results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia. 相似文献
13.
Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
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
14.
Davis MS Willard MD Nelson SL Mandsager RE McKiernan BS Mansell JK Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314
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
15.
Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
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
16.
B. Cinar Kul N. Bilgen J.A. Lenstra O. Korkmaz Agaoglu B. Akyuz O. Ertugrul 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2015,132(6):449-453
Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded. 相似文献
17.
Troxel MT Vite CH Van Winkle TJ Newton AL Tiches D Dayrell-Hart B Kapatkin AS Shofer FS Steinberg SA 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):850-859
The purpose of this study was to determine the frequency of different tumor types within a large cohort of cats with intracranial neoplasia and to attempt to correlate signalment, tumor size and location, and survival time for each tumor. Medical records of 160 cats with confirmed intracranial neoplasia evaluated between 1985 and 2001 were reviewed. Parameters evaluated included age, sex, breed, FeLV/FIV status, clinical signs, duration of signs, number of tumors, tumor location(s), imaging results, treatment, survival times, and histopathologic diagnosis. Most of the cats were older (11.3 +/- 3.8 years). Primary tumors accounted for 70.6% of cases. Metastasis and direct extension of secondary tumors accounted for only 5.6 and 3.8% of cases, respectively. Twelve cats (7.5%) had 2 or more discrete tumors of the same type, whereas 16 cats (10.0%) had 2 different types of intracranial tumors. The most common tumor types were meningioma (n = 93, 58.1%), lymphoma (n = 23, 14.4%), pituitary tumors (n = 14, 8.8%), and gliomas (n = 12, 7.5%). The most common neurological signs were altered consciousness (n = 42, 26.2%), circling (n = 36, 22.5%), and seizures (n = 36, 22.5%). Cats without specific neurological signs were common (n = 34, 21.2%). The tumor was considered an incidental finding in 30 (18.8%) cats. In addition to expected relationships (eg, meninges and meningioma, pituitary and pituitary tumors), we found that lesion location was predictive of tumor type with diffuse cerebral or brainstem involvement predictive of lymphoma and third ventricle involvement predictive of meningioma. 相似文献
18.
Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
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
19.
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