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狼尾草属(Pennisetum Rich)是个大属,中国是狼尾草属牧草资源最为丰富的国家之一。至今已发现并发表的包括常见种、引进种以及新发现种、新发现变种共计12种3变种(包括4个引进种)。狼尾草属牧草的广泛适应性、高产草量、高蛋白含量及无融合生殖特性等受到世界多国农业部门与育种专家的高度关注,在狼尾草饲用型、生态型、观赏型、能源型牧草开发应用方面取得了显著成就。狼尾草属优良草种的引种驯化、杂交育种和品种引进具有广阔的发展前景。 相似文献
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9个国产狼尾草野生种的特征特性与栽培利用研究 总被引:3,自引:0,他引:3
狼尾草属牧草种质资源十分丰富,全世界约有130种,多产于非洲.我国狼尾草野生种及野生近缘植物现已发表命名的有12种3变种(包括引进种).本文根据云南昆明和甘肃兰州两个牧草种质资源圃的引种结果,介绍了9个国产狼尾草野生种、变种的生态分布、特征特性与栽培利用. 相似文献
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为在牦牛养殖中合理使用狼尾草属杂交牧草提供理论指导,本研究通过体外方法 对狼尾草属杂交牧草进行营养价值评定并与全株玉米青贮作比较,探究狼尾草属杂交牧草在牦牛养殖中的应用价值。本研究通过以下三方面进行:(1)比较两种粗饲料的常规营养成分;(2)应用CNCPS体系评价并比较两种粗饲料的营养价值;(3)应用体外产气技术测定并比较两种粗饲料的体外发酵产气量和养分降解率。结果表明:(1)狼尾草属杂交牧草的粗脂肪、粗蛋白质、淀粉和磷的含量均极显著低于全株玉米青贮(P <0.01),分别低55%、25%、51%和46%。狼尾草属杂交牧草的酸性洗涤纤维和中性洗涤纤维含量都极显著高于全株玉米青贮(P <0.01),分别高44%和67%。狼尾草属杂交牧草的非蛋白氮和中性洗涤不溶性蛋白含量都显著高于全株玉米青贮(P <0.05),分别高38%和59%。(2)CNCPS评定结果表明,在碳水化合物组分中,狼尾草属杂交牧草的中速降解部分和非结构性碳水化合物含量分别低于全株玉米青贮50%和50%且差异极显著(P <0.01),慢速降解部分含量比全株玉米青贮高78%且差异显著(P <0.... 相似文献
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随着家蚕DNA分子标记和物理图谱的发展,基因组序列的释放,以及EST数据库和BAC文库的构建,FISH技术在家蚕的遗传学、基因组学研究,尤其是物理图谱研究中取得重要进展。本文综述了FISH及相关技术原理及近年在家蚕和部分鳞翅目昆虫研究中的应用,并对其在家蚕及鳞翅目昆虫的研究前景作了展望。 相似文献
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目的了解鸭血吸虫病在湖北省荆州太湖港地区的流行状况。方法用病原学检查方法调查鸭血吸虫感染率和螺类毛蚴感染率,用询诊法了解人群尾蚴性皮炎的患病情况。结果该地区鸭血吸虫感染率分别为湖滩放养鸭为4.52%,湖泊河流放养鸭为2.25%,螺类毛蚴感染率:湖滩椎实螺类为5.30%;湖区和坝区人群尾蚴性皮炎阳性率分别为8.89%和6.02%。结论该地区鸭血吸虫病流行仍较为严重,且对下水作业人员造成一定危害,是一个重要的公共卫生问题。 相似文献
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Heike Rudorf DMV Frances J. Barr MB PhD J. Geoffrey Lane BVM 《Veterinary radiology & ultrasound》2001,42(4):338-343
Forty dogs with clinical signs suggestive of upper respiratory tract disease underwent echolaryngography and laryngoscopy. Laryngoscopy was used as the definitive technique to diagnose laryngeal paralysis. The ultrasound investigation accurately indicated the presence of the paralysis and confirmed the uni- or bilateral nature of the disorder. Findings indicative of laryngeal paralysis included asymmetry or absence of motion of the cuneiform processes (30/30), abnormal arytenoid movement (16/30), paradoxical movement (9/30), caudal displacement of the larynx (2/30) and laryngeal collapse (1/30). Thirty dogs were found to be afflicted with laryngeal paralysis and ten had normal laryngeal motility. 相似文献
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Electrocardiograms were reocrded from 153 racehorses and 10 Olympic three-day-event horses. The horses were then grouped into those presented for routine examination, those in which there was a complaint of poor performance, those going to the Montreal Olympics, and those with upper respiratory tract abnormalities. When the ECGs of the four groups were compared on the basis of detection of abnormality, it was found that 93.2% of the poor performance group showed abnormalities of various types. The routine examination group showed 21.1% of horses with abnormal ECGs, and over half of these have been followed to the point where it can be said they raced unsuccessfully. In particular, this applied to those horses with T wave abnormalities in 4 or more leads, and to those with intraatrial block. There were significant T wave changes in 50% of the Olympic horses, and 43.7% of horses with laryngeal hemiplegia showed abnormality. While it can be concluded that T wave changes are highly significant findings in an ECG, it is also true that modification of the training programme is a way of helping trainers to get the best out of horses which might otherwise have a serious limitation of their performance potential. 相似文献
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VICTOR T. RENDANO VMD MS BRUCE CAR BVSc MVS MICHAEL GILMAN DVM 《Veterinary radiology & ultrasound》1987,28(4):127-130
This case report describes the radiographic/clinical progression of a lesion in the middiaphysis of the radius in a dog. The lesion initially looked benign but progressed and eventually was diagnosed as an anaplastic osteosarcoma. 相似文献
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