Nitrogen balance in barrows fed low-protein diets supplemented with essential amino acids   总被引：3，自引：0，他引：3  

D. Deng  R.L. Huang  T.J. Li  G.Y. Wu  M.Y. Xie  Z.R. Tang  P. Kang  Y.M. Zhang  M.Z. Fan  X.F. Kong  Z. Ruan  H. Xiong  Z.Y. Deng  Y.-L. Yin   《Livestock Science》2007,109(1-3):220-223

This study was conducted to determine the effect of addition of essential amino acids (EAA) to low-protein diets on N balance in barrows. Thirty barrows (Duroc × Yorkshire) with an initial BW of 36 kg were fed 5 corn- and soybean meal-based diets containing 13.6 to 18.2% crude protein (CP) for 10 d in a randomized complete block design. The 18.2% CP diet was formulated without addition of EAA (Lys, Met or Thr). The other diets contained 13.6 to 16.5% CP and were supplemented with EAA to provide 0.83% true digestible lysine equal to that in the 18.2% CP diet. Fecal, urinary, and total N excretion as well as N retention (g/d) decreased with decreasing dietary CP level (P < 0.01). The apparent digestibility of N was almost the same for the 18.2 and 16.5 CP diets, but the value was 2% higher (P = 0.07) than that for the 13.6% CP diet. These findings indicate that, compared with the 18.2% CP diets, supplementation with three EAA to the lowest-protein diets (13.6 CP) is inadequate for maximum intestinal protein digestion, amino acid absorption, or tissue protein deposition in growing barrows.  相似文献   

Toxicity and biochemical action of amicarthiazol on citrus canker pathogen, Xanthomonas citri ex Hasse     

Qingchun Huang  Jihua Wu  Xiaotao Li  Manhui Liu  Yuping Kong 《Pesticide biochemistry and physiology》2006,84(3):188-195

Inhibitory effects of amicarthiazol, in vitro, against the growth of seven plant bacterial pathogens and its biochemical actions on Xanthomonas citri were investigated. The growth of Erwinia carotovora, Ralstonia solanacearum, and Pseudomonas syringe pv. syringae was not sensitive to amicarthiazol whilst Xanthomonads were all strongly inhibited in NB liquid medium; EC₅₀ of X. citri was 2.63 μg ml⁻¹ and the effectiveness of amicarthiazol depended on the timing of application. The inhibitions on the secretion of gross EPS and gross EPR as well as the activities of amylase, cellulase, and pectase of X. citri were increased with the concentrations of amicarthiazol, whereas the conductivities of the extracellular product suspensions and the protease activity were somewhat accelerated by the concentration less than 10 or 20 μg ml⁻¹ and inhibited only at higher concentration. EPS which was purified from X. citri showed obvious antagonistic effects on the inhibition of amicarthiazol, but not on the inhibition of Cu(OH)₂. The endogenous respirations and the activity of succinic dehydrogenase of X. citri were also inhibited and the inhibitions were increased with the toxic concentrations. Furthermore, the potential induced physiological adaptability of X. citri to amicarthiazol and the comparison with Cu(OH)₂ and carboxin were also discussed.  相似文献   

土壤容重对生姜生长及产量和品质的影响   总被引：1，自引：0，他引：1  

尚庆文  徐坤  孔祥波  王玉霞 《中国蔬菜》2006,1(11):18-20

以莱芜大姜为试材,研究了容重分别为1.49(CK)、1.36(T1)、1.20(T2)g·cm-3的3种土壤对生姜生长及产量、品质的影响。结果表明,容重较小的土壤,其孔隙度较大,最大持水量较高,有利于生姜植株的生长和产量的提高。生长末期T2的株高、茎粗、分枝数和叶片数分别比CK增加17.9%、14.0%、35.2%和36.1%,单株根、茎、叶、根茎鲜质量分别比CK提高43.3%、24.4%、28.1%和35.2%,收获时CK、T1、T2的产量分别为2534.1、3017.7和3326.8kg·(667m2)-1,处理间差异极显著。此外,生姜根茎干物质、淀粉及挥发油含量随土壤容重降低而降低,而蛋白质、游离氨基酸则相反,粗纤维、可溶性糖及VC含量则基本不受土壤容重的影响。  相似文献   

复方中草药抗乳炎奶牛饲料添加剂的研制     

王仁雷  黄亚东  孔庆新 《中国动物检疫》2007,24(9):38-39

试验结果显示,所研制的3种新制剂对奶牛乳腺炎均有明显的防治效果,同时对提高产奶量,改善牛乳的品质和风味、降低牛乳中的体细胞数也有显著的效果。  相似文献   

30.5%毒死蜱·甲氨基阿维菌素笨甲酸盐微乳剂防治小菜蛾田间药效试验     

马洪艳  孙景文  孔斌  王凤芝 《农药科学与管理》2007,28(4):32-33

田间试验表明,30.5%毒死蜱·甲氨基阿维菌素苯甲酸盐微乳剂对小菜蛾有良好的防治效果,15～25 mL/667 m2后14d防效均达98%以上.  相似文献   

豆瓣菜不同茎节扦插繁殖试验     

叶元英 《长江蔬菜》1998,(6):22-23

以豆瓣菜葡匐茎的上,中、下三段的试材,进行不同茎段的扦插繁殖试验结果表明,中段成活率高,分枝快,适于做扦插材料。  相似文献   

枯草芽孢杆菌抗菌物质对镰刀菌抑制机理的镜下研究   总被引：18，自引：1，他引：17  

孔建  河野满 《植物病理学报》1998,28(4):337-340

 将枯草芽孢杆菌B-903菌株液体培养72h后,将培养滤液高温灭菌,以不同比例将培养滤液加入镰刀菌孢子悬浮液中,置于扫描电镜和光学显微镜下定时观察。在处理12h后,镰刀菌孢子芽管顶端、菌丝末端及菌丝中央的多处细胞均可发生畸形的球状结构,这种畸变结构随处理时间延长而增加,致使菌丝变成捻珠状。处理36h后,畸变球形细胞及菌丝纷纷断裂离解,细胞内含物渗出,致使大部分细胞成为空泡。到处理48h后,镜下几乎无完整菌丝,均成单个的球状细胞空泡,这些空泡最终胞壁崩裂,不复存在。笔者认为正是枯草芽孢杆菌在生活过程中分泌到体外的抗高温代谢物对镰刀菌孢子和菌丝细胞的这种畸变作用造成拖子和菌丝失活,侵染能力丧失。  相似文献   

水稻白叶枯病菌毒素对水稻不育系珍汕97A的专化毒性     

孔繁明 《植物病理学报》1998,28(2):113-116

 采用乙酸乙酯法提取对珍汕97不育胞质具有专化毒性的白叶枯病菌AH28、GX50和非专化毒性的OS14菌株的毒素。以不同浓度的毒素处理珍汕97不育系和保持系的种子或幼苗,可引起水稻叶片褪绿和细胞坏死,产生与接种病菌相似的症状,在蚕豆叶片上形成过敏性坏死斑;毒素可导致水稻幼苗萎蔫、胚根胚芽生长受抑和根冠细胞死亡;毒素的毒性与毒素浓度和产毒素菌株的致病力成正比;专化性毒素AT对珍汕97不育系的毒害程度显著高于对保持系的毒害。  相似文献   

陆生固氮蓝藻对土壤环境的影响   总被引：8，自引：2，他引：6  

康金花  关桂兰 《干旱区研究》1998,15(3):30-33

我们于１９８８－１９９０－年通过野外调查和室外试验,探讨了陆生固氮蓝藻对土壤环境的影响。试验证明,陆生固氮蓝藻可以利用空气中的分子态氮合成氮素化合物,不断地加富土壤中的氮化物。同时,由于它们大量的繁殖和死亡腐解也增加了土壤中的有机物质使土肿微生物的生长和活动更加旺盛,土  相似文献   

Nucleotide sequence homology to bovine viral diarrhea virus 2 (BVDV 2) in the 5′ untranslated region of BVDVs from cattle with mucosal disease or persistent infection in Japan     

M. Nagai  M. Sato  H. Nagano  H. Pang  X. Kong  T. Murakami  T. Ozawa  H. Akashi 《Veterinary microbiology》1998,60(2-4):271-276

Cytopathogenic and non-cytopathogenic bovine viral diarrhea viruses (BVDVs) were isolated from cattle with mucosal disease or persistent infection in Japan. These isolates were compared for antigenic properties by cross-neutralization tests with Japanese reference strains of BVDV belonging to classical type 1. Significantly low cross-reactivity to reference strains was noted, indicating the viruses to possibly represent a new serotype in Japan. Thus, to determine the genotype of the isolates, nucleotide sequences of the 5′ untranslated region were determined and compared with those of previously reported BVDV 1 and 2. The isolates were clearly shown to belong to BVDV 2, not to BVDV 1.  相似文献