提高烤烟上部叶可用性研究进展   总被引：10，自引：0，他引：10  

杨磊  易克  简永兴  腊贵晓  李英芝  刘亮飞  王华 《作物研究》2011,25(1):71-75

提高烤烟上部叶的可用性成为提高烟草整体经济效益、保证烟草行业可持续发展的重要课题之一。传统研究只从影响上部烟叶可用性的一个角度或者几个角度进行研究,缺乏系统性,不能建立一套完整的提高上部烟叶可用性的综合技术措施。综述了品种、生态环境因素、农业栽培技术措施、成熟度、调制方法、化学调控、经济调控等7个方面对烤烟上部叶可用性的影响,并就进一步的研究提出展望,以其为提高我国烤烟上部叶可用性提供理论依据。  相似文献   

Maslinic acid and ration size enhanced hepatic protein‐turnover rates of gilthead sea bream (Sparus aurata)     

E.E. RUFINO‐PALOMARES  F.J. REYES‐ZURITA  L. GARCÍA‐SALGUERO  J. PERAGÓN  M. DE LA HIGUERA  J.A. LUPIÁÑEZ 《Aquaculture Nutrition》2012,18(2):138-151

Maslinic acid (MA) is a natural triterpene that can be used as an additive in the diet of trout. We investigated the effects of feeding with MA and a fixed ration (10 g kg^?1 body weight) with respect to growth, protein‐turnover rates and nucleic‐acid concentration in the liver of gilthead sea bream grown under fish‐farm conditions. Five groups of 12 g of a mean body mass were fed for 210 days with diets containing 0 (control), 0.05 and 0.1 g of MA per kg of diet. Two groups were fed ad libitum (control AL and MA₁₀₀AL), and three with a fixed ration (control R, MA₅₀R and MA₁₀₀R). At the end of the experiment, higher body weights, liver weight, feed‐efficiency and PER were found in MA₁₀₀AL and MA₁₀₀R fish. Fractional and absolute protein‐synthesis rates in liver of MA₁₀₀R fish were higher than in the control, resulting in a higher absolute protein‐accumulation rate and tissue growth. Total DNA content in MA₁₀₀AL and MA₁₀₀R was higher than in control. Studies of light and electron microscopy corroborated these results. These findings indicate that MA added to the diet can stimulate growth, hepatic protein‐turnover rates and tissue hyperplasia in gilthead sea bream.  相似文献   

西北寒旱地区湖羊及其杂交后代生长发育模型分析     

喇永富  席锐  李发弟  王维民  张小雪  李冲  刘婷  唐德富  李宝胜 《草业学报》2016,25(9):182-188

本试验测定了舍饲条件下的215只湖羊和60只湖杜湖[湖羊♂×(杜泊羊♂×湖羊♀)♀]杂交羔羊0~12月龄的体重,采用Gompertz模型和Logistic模型拟合了湖羊和湖杜湖杂交羔羊0~12月龄生长过程,并分析比较了生长参数及模型估计值,进而评价湖杜湖的杂交优势。结果表明,2种模型的拟合度(R²)均在0.96以上,拟合效果好,其中Gompertz模型拟合两个种群效果好于Logistic模型;湖羊公、母羔拐点月龄分别为2.55和1.73个月,拐点体重分别为17.00和13.14 kg;湖杜湖公、母羔拐点月龄均早于湖羊,公、母羔拐点体重分别相差0.74和2.66 kg,公、母羔累积生长均极显著高于湖羊(P<0.01)。结果说明湖杜湖早期生长强于湖羊,湖杜湖杂交效果显著。  相似文献   

无角牦牛与有角牦牛血液生理、生化指标的比较研究     

张志飞  梁春年  郭宪  王宏博  丁学智  吴晓云  褚敏  裴杰  拉环  张国模  阎萍 《中国畜牧兽医》2016,43(12):3257-3262

本研究从血液生理、生化指标水平探讨有角和无角牦牛群体的体况和代谢差异,为无角牦牛新品种的选育提供理论依据。试验检测了有角、无角牦牛群体的30项血液生理与生化指标,并用独立样本t检验对两个群体测得的各项指标进行了比较分析。结果表明,两群体间有11项指标差异极显著（P<0.01）,5项指标差异显著（P<0.05）,14项指标差异不显著（P>0.05）。从测定的数据初步判定,有角与无角牦牛群体在高原低氧适应性、肝脏代谢、肾脏代谢及骨质形成方面存在一定差异,无角牦牛比有角牦牛更适应高原低氧的环境。本试验结果可为牦牛品种资源的合理保护和利用以及新品种的选育提供科学依据。  相似文献   

Pyogranulomatous lesion causing neurological signs localised to the sacral region in a horse     

LA Cudmore  JC Groenendyk  P Hodge  S Church 《Australian veterinary journal》2012,90(10):392-394

This case report describes neurological signs associated with a pyogranulomatous lesion within the sacral vertebral canal of a horse. The clinical findings included urinary overflow incontinence and reduced anal, perianal and tail tone. The horse failed to respond to medical management and a guarded prognosis for return to athletic performance initiated the decision for euthanasia.  相似文献   

西北寒旱地区舍饲湖羊生长发育特征研究     

莫负涛  李发弟  王维民  喇永富  张小雪  刘婷  唐德富  乐祥鹏  李飞  李冲  李万宏  肖金玉  谭建华  武得虎 《草业学报》2017,26(1)

湖羊是世界上稀有的绵羊地方品种,以多胎、早熟、早期生长发育快、宜舍饲等优良性能而著名。为系统了解湖羊生长发育的基本规律,更好地开发利用湖羊这一优良地方品种资源,本研究以3,6,12和24月龄湖羊公羊为对象,每个时间点随机选择6只,共24只,测定其体重、组织器官及消化道各个部分重量、肠道长度及肉品质相关参数。结果表明,3~6月龄湖羊生长速率最快,6月龄之后逐渐降低;3~6月龄之间心、肝、脾、肺、肾、头蹄和皮的增长强度随着日龄的增大而增长,除头、蹄、皮外,其他内脏器官的生长强度逐渐降低,12月龄之后趋于稳定;头、蹄、皮的生长在6月龄之后趋于稳定,仍然保持较高的生长强度;瘤胃的生长强度始终大于体重生长强度,小肠的生长始终小于体重,而除直肠外,大肠的生长强度与体重相近。6月龄湖羊公羔与12月龄相比屠宰率、眼肌面积无显著差异,而6月龄湖羊公羔背膘厚极显著增高,随着年龄的增长肉色逐渐变暗。综合以上各项指标认为,本试验条件下,6月龄为肥羔生产最佳屠宰日龄。  相似文献   

Performance of Hu sheep in the cold,arid area’s of North-West China     

MO Fu-Tao  LI Fa-Di  WANG Wei-Min  LA Yong-Fu  ZHANG Xiao-Xue  LIU Ting  TANG De-Fu  YUE Xiang-Peng  LI Fei  LI Chong  LI Wan-Hong  XIAO Jin-Yu  TAN Jian-Hua  WU De-Hu 《草业学报》2017,26(1):168

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牧区饲草储备量与牲畜出栏率的直线回归分析     

拉措吉 《青海草业》2006,15(3):13-14,4

饲草料储备量与牲畜出栏率之间存在着回归关系,建立回归方程;Y=-1.79 1.6x,预测和防止冬季牲畜缺草而形成的牲畜损失。  相似文献   

Infertility in a Dog due to Proximal Cytoplasmic Droplets in the Ejaculate: Investigation of the Significance for Sperm Functionality In Vitro     

AI Peña  M Barrio  JJ Becerra  LA Quintela  PG Herradón 《Reproduction in domestic animals》2007,42(5):471-478

A 4-year-old Basque Shepherd male dog was presented for breeding soundness evaluation after the dog failed to impregnate the three bitches he had mated. Clinical examination showed no anomaly of the reproductive system. Semen evaluation showed normal sperm count (640 x 10(6)), 80% had progressively motile spermatozoa, and 96% had morphologically abnormal sperm of which 84% had proximal cytoplasmic droplet and 12% had proximal droplet plus other anomaly. A zona pellucida-binding assay, using canine oocytes derived from frozen-thawed ovaries, was performed in order to investigate the zona-binding ability of dog spermatozoa with proximal cytoplasmic droplets. For the zona pellucida-binding assay, ovaries were thawed and minced in phosphate-buffered saline + 0.4% bovine serum albumin, the oocytes recovered were divided into two groups of 35-40 oocytes to be, respectively, used with the infertile dog and with a control fertile dog. Spermatozoa were capacitated in Canine Capacitating Medium (CCM) at 38.5 degrees C and 5% CO(2) in air for 2 h before oocyte insemination. Groups of five to six oocytes placed in 45 microl droplets of CCM were incubated for 1 h. Afterwards, 5 microl of CCM containing 25,000 spermatozoa were added to each droplet and co-incubated for 2 h before fixation and evaluation of the complexes. After oocyte insemination, sperm motility and viability were evaluated: the sample from the infertile dog had 85% sperm motility with fast and linear progressive movement, and sperm viability of 92%. The sample from the control dog showed 40% sperm motility with fast and highly curvilinear and erratic movement, high degree of sperm agglutination and sperm viability of 32%. For the infertile dog the mean number of bound spermatozoa/oocyte was 0.33 whereas for the control dog it was 1.80. It was concluded that dog sperm with proximal cytoplasmic droplets seem to lack normal capacitating ability in vitro, and consequently, they may have reduced capacity to bind to the zona pellucida of canine oocytes.  相似文献   

Development of a technique for standing hand‐assisted laparoscopic splenectomy in five horses          下载免费PDF全文

LA Gracia‐Calvo  M Martín‐Cuervo  J Jiménez  V Vieítez  D Argüelles  ME Durán  J Ezquerra 《Australian veterinary journal》2015,93(6):183-188

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