FA旱地龙对寒地大田作物增产的研究

研究了ＦＡ旱地龙对玉米、大豆的增产作用。结果表明,用３００倍液喷施玉米、大豆,可玉米增产１２．９％,大豆产量增加１３．５％。     

地膜覆盖、FA旱地龙在师宗经果林建设中的应用

经果林营造是小流域水保生态建设的重要内容。为在旱季提高苗木的成活率,在溜子田小流域经果林建设中采用了地膜覆盖和喷施FA旱地龙技术。地膜覆盖能保证树苗根部有足够的水分供应,FA旱地龙能减少植株水分蒸腾,从而使苗木成活率达96％以上。这两种技术措施对植株增高也有显著作用。     

Adipose tissue and muscle fatty acid profiles of steers fed red clover silage with and without flaxseed

The current study examined the effects of inclusion of flaxseed in a red clover silage diet on growth, carcass quality, adipose tissue and muscle fatty acid (FA) profiles of beef steers. Twelve British×Continental crossbred steers (363±26.5 kg) were randomly assigned to two pens and fed diets containing 70% red clover silage, 15% steam rolled barley/vitamin–mineral supplement and either additional 15% steam rolled barley or 15% triple rolled flaxseed (all DM basis) for 215 d. Diet had no effect (P>0.05) on average daily gain or carcass quality atributes. Overall, FA profiles in all tissues followed similar trends when flaxseed was added to the diet but intramuscular fat had the highest proportions of n-3 and n-6 polyunsaturated FA (PUFA) while subcutaneous fat had largest proportions of conjugated linoleic acids (CLA) and perirenal fat had the highest proportions of trans-18:1 isomers, particularly vaccenic acid (VA). Feeding flaxseed increased (P<0.05) percentages of α-linolenic acid (ALA; 1.1–1.6% of total FA), total n-3 PUFA, conjugated linolenic acids, non-conjugated linoleic acids (mostly t11,c15-18:2), and led to unprecedented increases in CLA (mainly rumenic acid, RA; 1.1–2.9%), and trans-18:1 isomers (chiefly VA; 5.9–9.5%) in muscle and adipose tissues. Flaxseed also reduced individual and total n-6 PUFA, cis-monounsaturated FA, branched-chain FA and saturated FA (mainly 16:0) in beef lipids. Overall, feeding flaxseed in a red clover silage diet enhanced the levels of FA with a positive health image (ALA, 2-fold; RA, 3 to 4-fold and VA, 4 to 5-fold) and reduced the levels of less desirable FA (n-6 PUFA; 14:0, 16:0) in muscle and adipose tissues without adverse effects on growth and carcass quality. Differences in tissue FA composition were also noted, and high levels of VA in perirenal fat in particular have potential for use in testing for health effects and development of value added beef and other food products.     

Evaluation of normal appearing spinal cord by diffusion tensor imaging,fiber tracking,fractional anisotropy,and apparent diffusion coefficient measurement in 13 dogs

Background

Functional magnetic resonance (fMR) imaging offers plenty of new opportunities in the diagnosis of central nervous system diseases. Diffusion tensor imaging (DTI) is a technique sensitive to the random motion of water providing information about tissue architecture. We applied DTI to normal appearing spinal cords of 13 dogs of different breeds and body weights in a 3.0 T magnetic resonance (MR) scanner. The aim was to study fiber tracking (FT) patterns by tractography and the variations of the fractional anisotropy (FA) and the apparent diffusion coefficient (ADC) observed in the spinal cords of dogs with different sizes and at different locations (cervical and thoracolumbar). For that reason we added a DTI sequence to the standard clinical MR protocol. The values of FA and ADC were calculated by means of three regions of interest defined on the cervical or the thoracolumbar spinal cord (ROI 1, 2, and 3).

Results

The shape of the spinal cord fiber tracts was well illustrated following tractography and the exiting nerve roots could be differentiated from the spinal cord fiber tracts. Routine MR scanning times were extended for 8 to 12 min, depending on the size of the field of view (FOV), the slice thickness, and the size of the interslice gaps. In small breed dogs (< 15 kg body weight) the fibers could be tracked over a length of approximately 10 vertebral bodies with scanning times of about 8 min, whereas in large breed dogs (> 25 kg body weight) the traceable fiber length was about 5 vertebral bodies which took 10 to 12 min scanning time. FA and ADC values showed mean values of 0.447 (FA), and 0.560 × 10^-3 mm²/s (ADC), respectively without any differences detected with regard to different dog sizes and spinal cord 45 segments examined.

Conclusion

FT is suitable for the graphical depiction of the canine spinal cord and the exiting nerve roots. The FA and ADC values offer an objective measure for evaluation of the spinal cord fiber integrity in dogs.     

Insect‐based diets high in lauric acid reduce liver lipids in freshwater Atlantic salmon

We evaluated the effect of a diet containing insect meal and insect oil on nutrient utilization, tissue fatty acid profile and lipid metabolism of freshwater Atlantic salmon (Salmo salar). Insect meal and insect oil from black soldier fly larvae (Hermetia illucens, L.; BSF), naturally high in lauric acid (12:0), were used to produce five experimental diets for an eight‐week feeding trial. 85% of the dietary protein was replaced by insect meal and/or all the vegetable oil was replaced by one of two types of insect oil. A typical industrial diet, with protein from fishmeal and soy protein concentrate (50:50) and lipids from fish oil and vegetable oil (33:66), was fed to a control group. The dietary BSF larvae did not modify feed intake or whole body lipid content. Despite the high content of saturated fatty acids in the insect‐based diets, the apparent digestibility coefficients of all fatty acids were high. There was a decrease in liver triacylglycerols of salmon fed the insect‐based diets compared to the fish fed the control diet. This is likely due to the rapid oxidation and low deposition of the medium‐chain fatty acid lauric acid.     

猪繁殖与呼吸综合征毒株在Vero细胞上的增殖验证试验

为验证猪繁殖与呼吸综合征病毒在Vero细胞上的增殖,进一步规范非禽源外源病毒检验操作,将目前国内用于疫苗生产的5个猪繁殖与呼吸综合征病毒毒株分别在Vero细胞上继代．观察细胞病变并进行荧光抗体染色。结果显示,国内5个猪繁殖与呼吸综合征病毒毒株均能在Vero细胞上增殖,且能引起细胞出现圆缩、聚集和脱落等典型的PRRSV细胞病变,在细胞胞浆内也可观察到特异性绿色荧光。结果提示在进行猪繁殖与呼吸综合征活疫苗外源病毒检验时,样品须进行特异性血清中和处理．以赍,干扰外源病毒枪蛤结集垧判常     

抗旱节水剂在葡萄栽培上的应用试验研究

通过保水剂、旱地龙、BGA土壤激活剂3种抗旱节水剂在葡萄种植上的田间试验，分析多种抗旱节水剂集成应用对土壤含水率、葡萄产量、葡萄品质(主要指可溶性固形物)的影响。结果表明，保水剂、旱地龙、BGA土壤激活剂在旱地果园的抗旱保墒中均有一定的效果，对于提高葡萄的品质和产量起着积极作用。     

不同腐殖酸类对黄土坡面侵蚀和养分流失的影响

在陕西省长武县黄土高原农业生态试验站进行了在相同的上方来水量18L/min条件下3种不同腐殖酸类(NHA、BFA、FA)的黄土坡面侵蚀和养分流失的试验,分析了不同腐殖酸类及不同量的同一腐殖酸对土壤侵蚀和养分流失的影响。结果表明:不同量的NHA处理下,径流量均随时间的增加而增加,NHA浓度150,300g/m~2的坡面径流量是500g/m~2的坡面径流量的1.14,1.08倍,含沙率和Br-浓度均随时间的增加而减少,累积径流量、累积泥沙量、累积流失量均随用量的增加而减少,150,300g/m~2的坡面累积泥沙量是用量500g/m~2的2.16,1.87倍,累积Br-流失量是用量500g/m~2的1.38,1.23倍,用量500g/m~2 NHA对防止土壤侵蚀和养分流失的效果最佳;不同浓度FA处理下,径流量随时间的增加而增加,FA浓度为0.1%,0.03%的累积径流量是浓度0.05%的1.19,1.33倍,含沙率和Br-浓度大体随时间的增加而减少,累积径流量、累积泥沙量、累积流失量均随浓度的增加先减少后增加,浓度为0.1%,0.03%的累积泥沙流失量是浓度0.05%的3.03,4.09倍,累积Br-流失总量是0.05%Br-流失总量的1.1,1.26倍,浓度0.5%FA对防止土壤侵蚀和养分流失的效果最佳;不同浓度BFA处理下,径流量随时间的增加而增加,BFA浓度为0.1%,0.05%的坡面累积径流量是浓度0.03%的1.15,1.1倍,含沙率和Br-浓度随时间的增加而减少,累积径流量、累积泥沙量随浓度的增加而增加,累积流失量随浓度的增加先减少后增加,浓度为0.1%,0.05%累积泥沙量是0.03%累积泥沙总量的1.36,0.49倍,Br-流失总量是0.05%Br-流失总量的4.06,3.5倍,浓度0.5%BFA对防止土壤侵蚀和养分流失的效果最佳;综合考虑3种不同腐殖酸类防止坡面侵蚀和养分流失效果为BFAFANHA。     

不同栽植代数29年生杉木林土壤腐殖质及结合形态的研究

国内许多学者对不同栽植代数的杉木（Ｃｕｎｎｉｎｇｈａｍｉａｌａｎｃｅｏｌａｔａ（Ｌａｍｂ．）Ｈｏｏｋ．）林生产力及林地土壤理化性质、土壤微生物及生化活性的研究有较多的报道,但对不同栽杉代数处于近熟时林分土壤腐殖质组成及其结合形态的研究报道则较少（方奇...     

牦牛FASN基因多态性及其与肉质性状的相关性研究

利用PCR-SSCP技术,对甘南牦牛、大通牦牛和天祝白牦牛的FASN基因第3内含子进行SNPs筛选,并将筛选到的突变位点与牦牛部分肉质性状进行相关性分析.结果发现,3个牦牛群体在第3内含子检测到g.5477 C→T的突变,由此产生3种基因型：HH、HG、GG.相关性分析表明,HH基因型和HG基因型个体的脂肪含量显著高于GG基因型个体（P＜0.05）.HH、HG、GG 3种基因型对失水率、熟肉率、pH24值和剪切力的影响差异不显著（P＞0.05）.