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1.
选用２４００羽艾维菌父母代种母鸡分４组,饲喂不同水平的泛酸饲料,添加量分别为０,５０,１００,１５０ｍｇ·ｋｇ－１日粮,在夏季进行为期６０ｄ的饲养试验,研究炎热季节泛酸对种母鸡生产性能和繁殖性能的影响。结果表明,高剂时泛酸提高种母鸡的产蛋量（Ｐ＜００１）、蛋重（Ｐ＜００５）和采食量（Ｐ＜００５）泛酸具有改进蛋品质的作用,提高浓蛋白高度、哈夫单位（Ｐ＜００１）,促进蛋黄的合成（Ｐ＜００５）,降低蛋黄中胆固醇含量（Ｐ＜００１）,增加蛋壳的厚度和强度（Ｐ＜００５）;泛酸提高种蛋的受精率和孵化率（Ｐ＜００５）,对降低胚胎后期死亡率有明显的作用。 相似文献
2.
The occurrence in urine and in acid-autoclaved grass and liver extracts of a substance which appears to participate in the synthesis of folic acid by rat liver in vitro is described. A similar effect is produced by synthetic xanthopterin. The effect of these materials might be accomplished by (1) catalysis of the enzymatic synthesis of folic acid; (2) the release of folic acid not liberated by takadiastase from tissue complexes; or (3) their serving as substrate material for the enzymatic synthesis of folic acid. The data presented favor the last hypothesis and suggest that xanthopterin, or a substance derived from it, may constitute a portion of the folic acid molecule. The probable involvement of compounds related to ranthopterin in the formation of hemocytopoietic substances in several animal species is discussed. 相似文献
3.
哺乳仔猪补料中添加柠檬酸的效果研究 总被引：7，自引：0，他引：7
用16窝共152头荣昌纯种哺乳仔猪,以窝为单位随机分为四组,从21日龄开始分别喂给含0、0.5、1.0和1.5％柠檬酸的饲粮至60日龄结束。测定柠檬酸添加量对饲粮PH、哺乳仔猪增重、饲料进食量及利用率、血清总蛋白及血浆尿素氮、仔猪腹泻率的影响。结果表明:0.5、1.0、和1.5％三个柠檬酸饲粮组分别与0组比较:饲粮PH降低0.75、1.10和1.45个PH单位;日增重提高14.88、7.02和3.31％,日进食饲料量(Y)与柠檬酸水平(X)呈Y=264+165x-154x~2二次曲线;日增重与日进食饲料量呈强正相关(r=O.97,p<0.05);单位增重消化能消耗改进5.88、2.87和-2.15％;血清总蛋白增加0.57、0.52和0.10克/升,血浆尿素氮降低0.73、0.66和0.60毫摩尔/升;仔猪腹泻率减少27.83、28.0和16.17％。在哺乳仔猪补料中添加适量的柠檬酸对改进仔猪生产性能有效。 相似文献
4.
箬竹叶水提取物化学成分研究 总被引：14，自引：1，他引：14
御江箬竹和阔叶箬竹叶水提取物的得率分别为９．６９％和１１．９０％。组成糖中前者以果糖为最多，其次为葡萄糖和甘露糖；后者以阿拉伯糖为最多，其次为果糖和甘露糖。组成氨基酸中两者均以谷氨酸、精氨酸、丙氨酸、天门冬氨酸和丝氨酸较多。水溶性维生素，御江箬竹以Ｖ＿ｃ、烟酸、叶酸和Ｖ＿（Ｂ１）较多，Ｖ＿（Ｂ６）、胆碱和泛酸未检出；阔叶箬竹则以烟酸、Ｖ＿ｃ和Ｖ＿（Ｂ１）较多，Ｖ＿（Ｂ６）、Ｖ＿（Ｂ２）、叶酸、泛酸和胆碱未检出。本研究还测定了箬竹部分微量和常量元素的含量。 相似文献
5.
Leuchtenberger R Leuchtenberger C Laszlo D Lewisohn R 《Science (New York, N.Y.)》1945,101(2611):46-48
Complete regressions of spontaneous breast cancers in mice were observed in 38 among 89 animals (43 per cent.). The treatment consisted of daily intravenous injections of 5 micrograms of l. casei factor ("folic acid"). The treated animals lived longer than the controls, especially the healed mice. The incidence of the development of new tumors was decreased among the treated mice as compared with the controls. 相似文献
6.
饲粮中添加叶酸对乐平母猪繁殖性能的影响 总被引：2，自引：0，他引：2
本研究选用本地猪种乐平花猪以探讨饲粮中添加叶酸对繁殖母猪的作用效应。２７头经产母猪根据年龄、胎次与系祖来源随机分为３个处理组，即在妊娠和哺乳期基础日粮中分别添加叶酸０（作为对照）、２ｍｇ／ｋｇ和６ｍｇ／ｋｇ。结果表明：添加叶酸提高了总窝产仔数、窝产活仔数及４０日龄育成数（Ｐ＜０．１或Ｐ＜０．０５），尤其是添加叶酸６ｍｇ／ｋｇ组的总窝产仔数和窝产活仔数分别提高了１．８９头和１．３４头；３个处理组的仔猪平均初生体重没有明显差异（Ｐ＞０．２５），但是初生窝重及４０日龄断奶窝重随着补充叶酸的增加而明显地增加（Ｐ＜０．１或Ｐ＜０．０１）。虽然各处理组的母猪在繁殖周期各阶段的体重没有变化（Ｐ＞０．２５）。，但添加叶酸组母猪的孕期增重及哺乳期掉膘却趋向于增加，且母猪妊娠期的增重愈多，其哺乳期掉膘亦愈多。本研究结果证明，在母猪妊娠和哺乳期基础饲粮中添加适宜剂量的叶酸，通过增加其窝产活仔数可以进一步发挥乐平母猪较高的生产性能 相似文献
7.
The percentage of isolated bean roots nodulated and the number of nodules per root were increased by the addition of mesoinositol to the agar medium into which the bases of bean roots were inserted. The following were without marked effect: glycine, thiamine, pyrodoxine, niacin, indoleacetic acid, gibberellic acid, kinetin, adenine, adenosinetriphosphate, biotin, riboflavin, calcium pantothenate, and folic acid. 相似文献
8.
叶酸对肉仔鸡蛋白质和生产性能影响的研究 总被引：1，自引：1，他引：0
选用1日龄艾维茵肉用雏鸡120只,按叶酸添加水平不同分为4个不同处理组,分别添加叶酸0、0.75、1.5和3.0mg/kg.于21日龄和42日龄采血,测定血液中蛋白质的量,同时记录日增重、日采食量,降低饲料转化率.结果表明:叶酸的添加显著提高了21日龄肉仔鸡血清蛋白含量(P<0.05),但对42日龄肉仔鸡血清蛋白质含量无显著影响(P>0.05).日粮中添加不同水平的叶酸.均能提高日增重、日采食量,降低饲料转化率,其中以添加叶酸3.0 mg/kg试验组的效果最好(P<0.05). 相似文献
9.
Lipman CB 《Science (New York, N.Y.)》1917,46(1186):288-290
1. Suboils of arid regions are certainly no less "raw" than those of semi-arid regions, and probably only slightly less so than those of humid regions. 2. If, as seems as yet unproved, inoculated legume seeds fail to develop on humid subsoil material, such failure can not justifiably be attributed as is done by Alway, McDole and Rost, to a lack of available phosphoric acid and potash. 3. A lack of available nitrogen probably is sufficient to account for rawness of subsoils. 4. The poor aeration of subsoils which indirectly results in their rawness, may be accounted for more simply than by Hilgard's explanation of the washing down of fine particles into the subsoil, which prevents proper aeration. 相似文献
10.
Severe granulocytopenia and anemia were developed uniformly in rats fed protein-free diets. Casein (18 per cent) prevented these dyscrasias, but crystalline L. casei factor ("folic acid") did not prevent them. In the correction of granulocytopenia in rats fed protein-free diets, L. casei factor alone was only slightly effective, diets of higher casein content (18 or 30 per cent) were ineffective under the experimental conditions described. However, L. casei factor combined with an 18-per cent casein-containing diet or L. casei factor combined with a mixture of purified amino acids were found to be highly effective in correcting the granulocytopenia. 相似文献
11.
In a study of the Konig reaction, it was found that nicotinic acid, on reacting with CNBr and certain substituted aromatic amines, yields glutaconic dialdehyde derivatives which fluoresce with a greenish-yellow light in visible violet light of about 440 millimicrons wave-length. A procedure was described which is applicable to 0.1 to 6 micrograms in 5 cc of solution or extract. It is suggested that the principle of preparing fluorescing "tagged" derivatives be applied to other vitamins of the B-complex. 相似文献
12.
The present study was conducted to evaluate the effects of different folic acid supplemental levels on growth performance,
serum biochemical indicators, and hepatic folate metabolism-related gene expressions in weaned piglets. There were 160 piglets
with initially average bodyweight of 7.33 kg randomly assigned to diets containing five levels of folic acid: basal diets
(C), 0.5 mg·kg−1 folic acid (FS 0.5), 2.5 mg·kg−1 folic acid (FS 2.5), 5.0 mg·kg−1 folic acid (FS 5.0), or 10.0 mg·kg−1 folic acid (FS 10.0). Blood samples were collected from a subset (n = 20; 4 pigs per treatment) of the piglets on day 0, 14, and 28. Liver samples were collected from the blood-taken piglets
on day 28 of the experiment. Pigs fed basal diet supplemented with 2.5 mg·kg−1 folic acid grew faster (P<0.05) and consumed more feed (P<0.01) than groups of C, FS 5.0, and FS 10.0 during the last two weeks. Dietary treatment had no effect on F/G throughout
the experiment. Pigs in the FS 2.5 group showed greater concentrations of Growth Hormone (GH) (P<0.05) and Insulin-like Growth Factors (IGF-1) (P<0.01) in serum than C and FS 10.0 on day 28. RT-PCR analysis revealed that FS 0.5, FS 2.5, and FS 5.0 had a greater abundance
of the mRNA encoding 5,10-methylenetetrahydrofolate reductase than C and FS 10.0 (P<0.01). The mRNA expressions of folate binding protein in FS 0.5 and FS 2.5 were upregulated compared with pigs fed with basal
diet (P<0.05). These results demonstrated that folate supplemental level of 2.5 mg·kg−1 significantly enhanced the growth performance of piglets. Folic acid had an impact on folate metabolism and the homocysteine
concentrations. No folate supplementation or folate supplemental level of 10 mg·kg−1 could not increase the growth performance to the greatest degree. 相似文献
13.
Like pantothenic acid, pantolactone, and the pantoate ion, pantoyltaurine and other pantothenic acid analogues of this type antagonize the inhibitory effect of salicylate on E. coli. It is suggested that the active antagonist in a solution of such an analogue is pantolactone or pantoate. These (particularly the former) could conceivably be contaminants of the analogues. However, the liberation of pantoate by hydrolysis, appears to be a more likely explanation for the antisalicylate effect. The presence of pantolactone or pantoate in a solution of pantoyltaurine and similar analogues of pantothenic acid provides a possible explanation for the ineffectiveness of these drugs in inhibiting the growth of microorganisms which can utilize pantolactone or pantoate for the synthesis of pantothenic acid. 相似文献
14.
不同蛋白源日粮对绵羊瘤胃氨基酸和肽释放影响的研究 总被引：1，自引：0，他引：1
选择 3只绵羊 ,采用 3× 3拉丁方设计研究不同蛋白源 (豆粕、鱼粉 ,玉米蛋白粉 )日粮对绵羊瘤胃肽和氨基酸释放影响 ,结果表明 :采食后 1h是氨基酸和肽释放的高峰。各处理组瘤胃内游离氨基酸组成 (采食后 6h内的平均值 )与饲料蛋白源蛋白质氨基酸组成相比 ,组氨酸 ,半胱氨酸 ,丙氨酸具有增加的趋势。鱼粉组、玉米蛋白粉组的肽氨基酸氮平均释放量 (采食后 6h内平均数据 )高于豆粕组 ,分别为 11.7mg氮 L ,9.0 1mg氮 L ,1.80mg氮 L。各处理组释放肽的氨基酸残基组成有一定的相似性 ,各组含量相对比例较高的有天冬氨酸 ,谷氨酸 ,酪氨酸和组氨酸 相似文献
15.
将400只1日龄艾维茵肉仔鸡随机分成4个处理,每处理5个重复,每重复20只鸡(公母各半);在 基础日粮——小麦-酪蛋白-鱼粉型日粮中分别添加0．3,0．9和2．7 mg／kg生物素,以基础日粮为对照,系统研究了 生物素对肉仔鸡免疫器官发育、机体免疫反应和神经内分泌激素的影响。结果表明:(1)生物素缺乏可抑制免疫器 官的发育,降低其重量指数;添加生物素可促进免疫器官发育,提高其重量指数。(2)添加生物素可促进细胞免疫反 应和体液免疫反应,提高血清中球蛋白水平及新城疫抗体滴度和IgG水平,极显著提高血液中T、B淋巴细胞转化 率。(3)添加生物素后,血清甲状腺素T4、三碘甲状原氨酸T3、生长激素和皮质醇水平均呈上升趋势。 相似文献
16.
镰刀菌酸(5-丁基吡啶-2-羧酸)是由镰刀菌所产生的一种弱酸性次生代谢产物,对植物有致萎蔫作用,近年来发现它对动物具有降低血压的作用.本实验的目的是证明镰刀菌酸对大白鼠血压的影响。实验结果表明:1.镰刀菌酸确有降低大白鼠血压的作用。2.使大白鼠血压显著下降的镰刀菌酸浓度为15mg/kg 体重。3.注射后2小时己明显下降,至5-8小时继续下降或维持,23小时后大白鼠的血压都恢复至注射前的水平。 相似文献
17.
许怀让 《上海交通大学学报(农业科学版)》1987,(1)
经77天的饲养试验,表明增毛添加剂以每日每头1克的剂量可使试验组毛用兔平均每头产毛量比对照组多37.76%(P<0.01),效果十分显着。 相似文献
18.
山西谷子资源叶酸含量分析及评价 总被引：10，自引：4，他引：6
【目的】通过对山西谷子资源叶酸含量的测定与评价,了解谷子叶酸含量的变异及其与地理分布的关系,为谷子种质营养含量和育种提供依据。【方法】分别在谷子的研究基地长治、汾阳和太原采集目前山西育种和种植中常用品种245个,记录谷子颜色后于60℃下烘干,采用常规方法研磨脱壳去糠,记录米粒颜色后研磨米粒,全部过100目筛子,测定其叶酸含量。叶酸用磷酸二氢钾溶液恒温水浴浸提,加苯胺处理过的活性炭吸附,用3%氨-70%乙醇洗脱,采用高锰酸钾氧化-间接荧光法测定。【结果】①山西省245份不同品种谷子叶酸含量平均为1.53 μg•g-1。谷子叶酸含量数值服从正态分布且为左偏态,说明谷子叶酸含量较多集中在平均值偏高水平。②不同地区谷子叶酸含量不同。同一品种在汾阳种植其叶酸含量显著低于太原和长治。日均温、日照时数和相对湿度对叶酸含量影响不显著,降雨量则显著影响叶酸含量。③谷粒颜色对叶酸含量影响不显著,小米颜色差异显著影响叶酸含量,从高到低依次为：褐色、绿色、黄色、鲜黄、浅黄和白色米粒品种。【结论】山西省谷子资源的叶酸含量存在较为丰富的遗传变异,变异范围0.37-2.37 μg•g-1,变异系数为26.2%。不同生态区谷子叶酸含量存在明显差异,春播晚熟区的叶酸含量显著高于春播中熟区。降雨量显著影响谷子叶酸含量。小米颜色差异对叶酸含量有显著影响。在鉴定评价基础上,以样品叶酸含量的平均数及其标准差（ ±s）为分类依据,筛选了一批高叶酸的谷子种质资源总计24份,占参试材料的9.8%。目前山西省农业生产常用谷子品种晋谷21,其叶酸含量约为2.0 μg•g-1,属于高叶酸含量品种。 相似文献
19.
试验用29日龄肉用仔鸡、以Cr_2O_3作指示剂、回肠末端取样法测定了含不同菜子饼的饲粮的氨基酸表观消化率,并比较了不同饲粮对肉用仔鸡生产性能的影响.结果表明:(1)榨油工艺影响菜子饼中硫葡萄糖甙水解物的量,200型螺旋压榨菜子饼、95型螺旋压榨菜子饼和200型螺旋压榨浸出菜子饼分别含6.691、3.668和2.104mg/g饼肉用仔鸡的甲状腺重与饲粮中菜子饼种类和用量有关.(2)三种菜子饼均降低了饲粮的氨基酸消化率,这种效应以200型螺旋压榨菜子饼最大,200型螺旋压榨菜子饼最小,95型螺旋压榨菜子饼居中.肉用仔鸡的生产性能与饲粮的氨基酸消化率相关. 相似文献
20.
异育银鲫对维生素C需要量的研究 总被引：15，自引：0，他引：15
在饲料中添加不同含量的结晶Vc（AA）和包膜从（CAA）饲养异育银鲫，结果发现，当饲料中缺乏Vc时，异育银鲫并没有表现出明显的缺乏症状，当饲料中的Vc添加量为AA400mg／kg或CAA200mg／kg时，异育银鲫的增重率和肝脏、血浆中的Vc含量达到最大。在本研究条件下，作者建议，异育很鲫对维生素C的需要量为200mg／kg饲料。 相似文献