幼龄鸡卵黄囊中^3H—VA的吸收代谢及其利用的研究   总被引：2，自引：0，他引：2  

蔡辉益  张姝 《畜牧兽医学报》1993,24(6):500-505

选用出壳后１２时龄的ＡＡ肉雏１４５只，采用放射性同位素＾Ｈ示踪方法，分别进行了饲养试验，屠补试验和代射试验研究表明，在全价日粮和无ＶＡ纯日粮条件下，雏鸡卵黄囊中的内源性３＾Ｈ－ＶＡ在体内发挥持续时间分别为２１天和１４天。卵黄囊（内源）３＾Ｈ－ＶＡ在鸡肠道中的吸收代谢，与饲料（外源）中营养物质相比，有着独自的特点。卵黄囊中内源３＾Ｈ－ＶＡ在雏鸡肠料中外源ＶＡ之间存在有动态交换关系，内源３＾Ｈ－ＶＡ主  相似文献   

合成滞育激素 蚕卵碳水化合物代谢的影响   总被引：6，自引：1，他引：5  

吴大洋  古泽寿治 《蚕业科学》2002,28(2):99-103

为了进一步阐明家蚕滞育激素在诱导滞育卵发生以及对蚕卵滞育过程中碳水化合物代谢的调节作用，对低温（16℃）暗催青的二化性品种大造，在化蛹初期注射合成滞育激素，诱导其产下滞育卵，然后将这种滞育卵分别用25℃和5℃保护，调查其在滞育过程中糖元、海藻糖、山梨醇和甘油量的变化。结果发现，从化蛹第3天开始，每天注射150pmol/合成滞育激素，连续3次，可得到70％左右的滞育卵。这种滞育卵在产卵初期糖元的含量与自然滞育卵相似，但山梨醇的含量仅有自然滞育卵的50％左右。诱导滞育卵在5℃中保护时，解除滞育的时间比自然滞育卵提前，孵化率比自然滞育卵低20％左右。未孵化卵大多在转青期死亡。由上述结果推测，这种诱导滞育卵在产卵初期糖元与山梨醇的代谢间存在某种障碍，从而影响山梨醇的合成，导致滞育的提前解除和胚胎发育异常。  相似文献   

Serum Beta Hydroxybutyrate Concentrations in Cats with Chronic Kidney Disease,Hyperthyroidism, or Hepatic Lipidosis          下载免费PDF全文

L. Gorman  L.C. Sharkey  P.J. Armstrong  K. Little  A. Rendahl 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2016,30(2):611-616

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啤酒有机酸代谢过程的研究     

单军  李红  郭玉蓉 《安徽农业科学》2008,36(15):6519-6520

[目的]研究啤酒有机酸的代谢过程。[方法]考察发酵液中乙酸、苹果酸、富马酸、琥珀酸、乳酸含量及有机酸总量在啤酒发酵过程中的变化,研究有机酸的代谢过程。[结果]随着发酵时间的延长,有机酸总量、苹果酸含量均呈增加趋势。乙酸含量占有机酸总量的比例很高,发酵时间的延长会明显导致发酵液中乙酸含量的增加。琥珀酸含量随发酵时间的延长而增加,第6~9天明显下降。在啤酒发酵初期,富马酸含量呈倍数增长,然后几乎没有变化,之后快速增长达到峰值,发酵后期明显下降。乳酸含量在发酵初期下降,在发酵中后期增加。[结论]在啤酒发酵过程中,发酵液中各种有机酸的含量均会发生变化,但变化曲线有所不同。  相似文献   

两种温度下不同品系银杏种子萌发生理的比较     

郁万文  曹福亮  汪贵斌  张往祥 《东北林业大学学报》2008,36(3):1-2,11

从银杏种子的发芽、呼吸强度、物质代谢等方面比较了10个银杏品系间发芽期耐冷性的差异及造成其差异的物质代谢基础。结果表明:低温降低了种子的呼吸强度,抑制了淀粉和蛋白质的水解,使低温萌发的种子中可溶性糖和游离氨基酸含量低于对照萌发的种子。在低温下,30、#26#和45#种子呼吸强度、淀粉和蛋白质的水解及可溶性糖和游离氨基酸的生成被抑制的程度较小,而17#、20#和31#被抑制的程度较大,从而造成30#、26#和45#在低温下具有较高的相对发芽势和相对发芽率,表现出较强的发芽期耐冷性,而17#、20#和31#的相对发芽势和相对发芽率较低。  相似文献   

聚乙二醇预处理对苇状羊茅种子萌发的生物效应研究   总被引：3，自引：0，他引：3  

贾俊仙  曹克林 《山西农业大学学报(自然科学版)》2000,20(4):397-399

用 2 0 %聚乙二醇 (PEG)— 6 0 0 0预处理苇状羊茅种子后 ,对其种子活力及生理生化方面研究的结果表明 :PEG预处理可提高种子发芽率和发芽指数 ,可降低电导率和丙二醛 (MDA)含量 ,可提高脱氢酶的活性。这说明该方法可减缓脂质过氧化、促进生物膜顺利修复 ;可提高参与萌发的酶的活性 ,从而使代谢正常启动。这样 ,可较高地提高种子的活力  相似文献   

黑暗诱导烟叶衰老过程中质体色素代谢规律研究   总被引：1，自引：0，他引：1  

赵二卫  赵宸楠  姚珊珊  崔红 《江西农业学报》2010,22(5):1-4

以烟草栽培品种K326为实验材料,在中部叶叶龄50 d时,对其进行单独叶片黑暗诱导衰老(individually darkened leaves,IDLs)处理,研究了烟叶质体色素及其降解成分含量变化、叶片衰老和质体色素代谢的关键基因表达规律。结果表明:在衰老过程中叶绿素和类胡萝卜素都在不断降解,在IDLs处理的第5 d时成熟特征显著;在IDLs第5 d衰老基因表达明显增强或减弱,色素合成基因表达减弱,分解基因表达显著增强。  相似文献   

Emerging evidence of the physiological role of hypoxia in mammary development and lactation     

Yong Shao  Feng-Qi Zhao 《畜牧与生物技术杂志(英文版)》2014,5(1):9

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Serum Chemistry and Hematology Changes in Neonatal Stock-Type Foals During the First 72 Hours of Life     

《Journal of Equine Veterinary Science》2020

Limited research has characterized blood chemistry in healthy stock-type foals. Our objectives were to determine foal serum chemistry and hematology changes during the first 72 hours postnatal and compare these with adult horse reference ranges. Over 3 foaling seasons, serum chemistry and hematology were determined for 16 healthy stock-type foals born to similarly managed mares. Blood was collected at 0 hours (before nursing but after standing, within 85 minutes of birth) and 6, 12, 24, 48, and 72 hours after initial sampling. Data were analyzed with sampling hour, year, and their interaction as fixed effects. Serum glucose and triglyceride concentrations increased (P < .001) from 0 to 24 hours. Triglycerides increased (P < .001) and glucose decreased (P = .01) between 24 to 48 hours. Serum nonesterified fatty acids increased (P = .04) from 0 to 6 hours and decreased (P ≤ .01) from 6 to 24 hours. Serum urea nitrogen increased (P < .001) between 0 and 6 hours and decreased (P < .001) from 12 to 72 hours. Serum total protein and globulin concentrations increased (P < .001) from 0 to 12 hours, albumin decreased (P ≤ .01) from 0 to 24, and creatinine decreased (P ≤ .02) from 0 to 72 hours. Hour also affected (P ≤ .03) electrolytes, metabolic enzymes, and all hematological components except for mean corpuscular hemoglobin (P = .77). These data demonstrate dynamic blood biochemical and hematological changes throughout the first 72 hours in foals, suggesting that sampling time should be considered when evaluating individual neonates.  相似文献   

The herbicide aclonifen: The complex theoretical bases of sunflower tolerance   总被引：1，自引：0，他引：1  

Özgür KilincRenaud Grasset  Stéphane Reynaud 《Pesticide biochemistry and physiology》2011,100(2):193-198

Aclonifen is a diphenylether herbicide in which one ring is unsubstituted and the other is NH₂-1, Cl-2, NO₂-6 substituted. This substitution, especially NH₂-1, is a particular feature in the diphenylether herbicidal family. In contrast with other herbicides of the same family (acifluorfen, oxyfluorfen, bifenox) this compound is not only acting through a phytotoxic protoporphyrin IX accumulation but also through an inhibition of carotenoid biosynthesis. Both biochemical targets are associated to chloroplast structuration in young seedlings under light and the pre-emergence or preplant treatment is consequently an appropriate agronomic strategy. Numerous weeds such as Alopecurus sp., Sinapis sp., Brassica sp., Chenopodium sp. are very sensitive to this herbicide but sunflower culture appears very tolerant. Our results suggest that this tolerance has a complex origin including (1) low root uptake, (2) conjugation in the roots probably with glutathione and (3) low xylem transfer from root to shoot. The low root uptake is associated to aclonifen crystallization on the root surface at high concentrations. The combination of this physico-chemical effect with a sufficient root conjugation rate can explain both the very low amounts of aclonifen or derivatives found in the aerial parts and the strong sunflower tolerance.  相似文献