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介绍了紫花苜蓿特性、栽培环境条件、整地与基肥的使用、品种选择、种子处理、播种技术、田间管理、苜蓿收割与存放、苜蓿产品的利用与加工等方面的技术,以期更好地提高牧草产量,促进畜牧业发展和农民增收。 相似文献
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秋眠级为 5的紫花苜蓿 ,干物质产量高、牧草质量优而著称的苜蓿品种。品种特性 ◆春季返青早 ,夏秋季生长旺盛 ,因而产量高。为法国、瑞士和德国干物质产量最高的苜蓿品种。◆茎秆柔弱 ,抗倒伏能力强 ,机械收获中的损失小 ;水肥报酬高 ,刈割后再生速度快。◆抗线虫能力非常强 ,持久性好 ;叶茎比高 ,消化率高于普通品种的 2 %。紫花苜蓿是饲喂奶牛等家畜最便宜和最安全的蛋白来源 ,选择苜蓿品种的时候不仅要考虑产量 ,品种的品质也非常关键。百绿培育的苜蓿品种不但高产 ,还具有蛋白含量高、能量含量高和纤维含量低的特点 ,因此生产出的干草… 相似文献
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杨家民 《养殖与饲料.饲料世界》2013,(6):36-37
紫花苜蓿是一种优质高产牧草,素有"牧草之王"的美誉。因其适应性广、生活力强、产量高、营养丰富,在我国很多地区都有种植。紫花苜蓿的种植看似简单,但是如果没有掌握好技术要点,则会影响产量、品质等。1选种紫花苜蓿的品种很多,选择适应当地气候环境条件的品种,可提高产量和品质。选择的主要依据是秋眠性(4~6级)、抗寒性、抗逆性、高产潜力、粗蛋白含量、中性洗涤纤维含量、酸性洗涤纤维含量、木质素含量等,可采用引种试验进行选择。一般WL903、WL525、WL525HQ等适合在南方种植;肇东苜蓿、敖汉苜蓿、草原一号等适合在北方种植。河 相似文献
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测定了33个中国紫花苜蓿国家审定品种的秋眠性、再生性、持久性和产量。结果表明:33个品种中除新疆大叶属于秋眠类型品种,其余品种均为半秋眠类型;供试品种中新疆大叶、甘农3号、晋南苜蓿、中苜1号、关中苜蓿、龙牧801和公农2号属于快速生长类型,内蒙准格尔、河西、草原1号和中兰1号属于慢速生长类型,其余各品种均为中速生长类型;中国紫花苜蓿国家审定品种中高产类型较少,仅占15.2%,中低产类型占大多数;各品种的持久性差异不大,均属于持久性强的类型。建议今后要在我国中南地区增加半秋眠、秋眠类型苜蓿品种的培育,在北方地区加强再生性的选择,培育持久性强的高产紫花苜蓿品种。 相似文献
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介绍了紫花苜蓿特性、栽培环境条件、整地与基肥的使用、品种选择、种子处理、播种技术、田间管理、苜蓿收割与存放、苜蓿产品的利用与加工等方面的技术,以期更好地提高牧草产量,促进畜牧业发展和农民增收。 相似文献
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通过营养调控缓解畜禽生产对环境的污染 总被引:27,自引:1,他引:26
针对畜禽生产规模不断扩大和集约化程度不断提高,畜禽生产对环境的污染日益严重的实际情况,本文从(1)饲料原料的选择;(2)减少畜禽粪便中氮的排出量;(3)降低畜禽排泄物中磷的排出量;(4)减少重金属的污染;(5)利用饲料添加剂;(6)改进饲料加工工艺6个方面系统综述了通过营养调控缓解畜禽生产对环境污染的具体措施。 相似文献
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家蚕对人工饲料摄食性的生理遗传学研究与展望 总被引:8,自引:2,他引:6
从家蚕对人工饲料摄食性的影响因素,摄食性的个体差异及其生理原因,摄食性的遗传模式及人工饲料育适应性蚕品种的选育等方面,总结了有关家蚕食性的研究成果和最新近进展,探讨了家蚕食性研究在人工饲料育实用化和广食性蚕品种选育等方面的实践意义。 相似文献
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肌内脂肪是影响肉品质的关键因素之一,影响着肉的嫩度、系水力、风味和多汁性。影响猪肌内脂肪沉积的因素较复杂,主要受品种、年龄、性别、营养、基因等多个因素影响。文章介绍了猪肌内脂肪的来源及其含量与猪肉嫩度、系水力、风味3个肉质性状的关联性,证实肌内脂肪与肉品质两者之间存在显著相关性;简述了影响猪肌内脂肪含量的几个主要因素,包括品种、体重、性别和日粮能量、蛋白质、维生素A等相关营养水平,脂肪酸合酶、心脏脂肪酸结合蛋白、脂联素等几个关键基因;初步阐释了这些因素对肌内脂肪沉积的影响及脂肪代谢机理,总结影响因素与肌内脂肪之间的规律;分析发现育种、候选基因和营养调控是改善肌内脂肪含量最有效的方法,将肉质更优的本土猪与外来猪进行杂交或对本土猪进行基因改良可能是未来较为有潜力的研究方向。 相似文献
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Janneke G. Allaart Alphons J.A.M. van AstenAndrea Gröne 《Comparative immunology, microbiology and infectious diseases》2013
Clostridium perfringens is one of the major causes of intestinal disease in humans and animals. Its pathogenicity is contributed to by the production of a variety of toxins. In addition, predisposing environmental factors are important for the induction of C. perfringens-associated enteritis as shown by infection models. Environmental contamination, gastric and intestinal pH, intestinal microflora, nutrition, concurrent infections, and medical interventions may influence the intestinal colonization, growth, and toxin production by C. perfringens. Prevention of C. perfringens-associated enteritis may be mediated by the use of feed additives like probiotics, prebiotics, organic acids, essential oils, bacteriophages, lysozymes, bacteriocins, and antimicrobial peptides. Here we summarize and discuss published data on the influence of different environmental predisposing factors and preventive measures. Further research should focus on feed composition and feed additives in order to prevent C. perfringens-associated enteritis. 相似文献
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高校辅导员是思想政治教育工作中的一支富有朝气的骨干力量,容易成为大学生的现实参照系。在分析学生群体的多边性、工作方法的科学性与创新性、教育内容的丰富性和前瞻性以及高校辅导员自身素质的综合性等制约因素的基础上,探索出充分发挥高校辅导员积极影响力的规律:关系的定位是前提.爱心是基础,好学和奉献是保障,模范带头是要求,走群众路线是途径,威信是体现。 相似文献
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Survival and inactivation of classical swine fever virus 总被引:2,自引:0,他引:2
Edwards S 《Veterinary microbiology》2000,73(2-3):175-181
Classical swine fever virus, like many enveloped viruses, may be regarded as moderately fragile. It shows a short but variable survival time in the environment, depending on physical conditions, but may remain viable for prolonged periods in favourable circumstances as found, for example, in stored meat. Published information is reviewed on the survival time of the virus under a variety of physical and chemical conditions, including the variable influence of environmental factors. The principles of virus inactivation by heat, pH or chemicals are discussed, with a consideration of the principles of containment for laboratories working with the virus. 相似文献
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A B Blancquaert S P Colgan W J Bruyninckx 《Veterinary immunology and immunopathology》1989,23(1-2):85-101
To identify the influence of technical factors on the in vitro motility of equine neutrophils towards streptococcus culture supernatant in an under-agarose assay, we studied the changes in eight cell migration parameters. The distances the phagocytes travelled by directed, random and spontaneous migration increased with incubation time, cell concentration and the gelatin and serum contents of the migration plates. The contribution of chemotaxis to the phagocyte migrations, however, decreased simultaneously. The directed and random, though not the spontaneous, migrations of the phagocytes increased also when the chemoattractant wells were placed closer to the cell wells but so did the influence of the chemokinetic activity of the bacterial culture supernatant on phagocyte motility. In contrast, preincubation of migration plates with the chemoattractant, the agarose content of the migration plates and contamination of the granulocytes with non-migrating, mononuclear cells did not substantially affect the in vitro migrations of the neutrophils. The changes in the in vitro motility of the equine neutrophils by these technical factors were, in general, comparable to those reported for human cells attracted by a variety of host-and bacteria-derived chemoattractants. 相似文献