去毒桐籽粕饲用价值的探讨

桐籽粕含有多种醇、二萜脂等有毒物质,因而长期以来只能用于肥料。桐籽粕中含代谢能5.46MJ/kg,粗蛋白质约36.13%,赖氨酸1.43%及较多的铁。小白鼠、肉用仔鸡饲养试验及屠宰测定试验表明:在肉用仔鸡前期日粮中加入5%～8%的桐籽粕,虽然略逊于优质蛋白质饲料,但作为中、低档蛋白质饲料资源,仍具有开发价值。     

高温胁迫下银杏离体枝条叶片的叶绿素荧光特性

银杏是一种重要经济树种,随着全球气温升高,高温适应性问题已经影响了其在低纬度区域的栽培。为了探明高温胁迫对银杏叶片光合过程的影响,本研究中离体银杏枝条被置于不同温度（25 ℃、30 ℃、35 ℃、40 ℃、45 ℃）下处理,随即对其叶绿素荧光参数进行监测。 结果显示：40 ℃以上高温胁迫下,银杏叶片的光系统II（PSⅡ）潜在光化学效率（Fv/Fo）、最大光化学效率（Fv/Fm）显著下降;最大荧光（Fm）、最大相对电子传递速率（rETRmax）、PSⅡ实际光化学效率（Yield）、光化学淬灭系数（qP）均显著下降;而初始荧光（Fo）和非光化学淬灭系数（NPQ）在40℃以上高温胁迫下显著上升。本研究表明,银杏离体枝条叶片光合作用对温度变化较敏感,推测高温可能伤害了光合机构,从而对光能的吸收、转换与光合电子传递都有显著的影响。银杏离体枝条叶片的叶绿素荧光动力学参数对高温的敏感性,可能有助于快速筛选和培育耐高温的银杏品种。     

五个典型柑桔品种的落花落果规律调查

以成年纽荷尔脐橙、兴津温州蜜柑、沙田柚、尤力克柠檬和圆金柑为材料,探索其花果脱落规律。结果表明,最终坐果率与总花量（含花蕾）显著负相关（P < 0.01）;平均单株花果脱落总数量为兴津温州蜜柑 > 纽荷尔脐橙 > 沙田柚 > 圆金柑 > 尤力克柠檬;平均单株花果脱落总干重为兴津温州蜜柑 > 纽荷尔脐橙 > 沙田柚 > 尤力克柠檬 > 圆金柑;纽荷尔脐橙、兴津温州蜜柑和沙田柚第一次生理落果数量大于第二次生理落果,尤力克柠檬和圆金柑第二次生理落果数量大于第一次生理落果。因此,纽荷尔脐橙、兴津温州蜜柑和沙田柚应重点防止第一次生理落果,尤力克柠檬和圆金柑应重点防止第二次生理落果。     

关于饲用酶制剂活性测定影响因素的分析

<正>饲用酶制剂是酶制剂工业的一个重要方面,饲用酶制剂的使用已经有50多年的历史,但饲用酶制剂的快速发展期却只是在最近的10～15年时间。近年     

Free choice feeding of whole grains in meat-type pigeons: 1. effect on performance,carcass traits and organ development

1. The effects of 5 different feeding systems on the performance, carcass traits and organ development were studied in pigeon squabs.

2. The 5 treatments were (1) whole grains of maize, pea and wheat plus concentrate feed; (2)whole grains of maize and wheat plus concentrate feed (CWC); (3) whole grains of maize and pea plus concentrate feed; (4)whole grain of maize plus concentrate feed (CC); and (5) compound feed (CF).

3. Feed intake of parent pigeons increased significantly from 0 to 21 d and it was higher in the CF treatment. Body weight of squabs in the CWC treatment was the highest among the 5 treatments in 4 weeks. Body weight losses of parental pigeons during the rearing period were not significantly different among the 5 treatments.

4. Protein intake in CC and CWC treatments was lower than that of the other three treatments. The CWC treatment had the highest daily weight gain and the lowest feed conversion ratio. Treatments were statistically similar in the relative weight of carcass, breast and thigh. CF had the lower relative weight of abdominal fat.

5. Relative weight of gizzard in the CF treatment was significantly lower than that of CWC.

6. It was concluded that the application of free choice feeding of whole grains of maize and wheat plus concentrate feed increased the body weight of 28-d-old pigeon squabs and decreased the feed conversion rate of parent pigeons. This feeding strategy could be commercially interesting in meat-type pigeon production.

     

11种优良坪用禾草对禾草云斑病抗性的初步研究

１９９７～１９９８年选用１１种坪用禾草品种在自然条件下做了对禾草云斑病的抗性鉴定。结果表明,结缕草、细叶结缕草及狗牙根不发病,表现免疫;高羊茅抗病;草地早熟禾、紫羊茅、黑麦草及匍茎剪股颖发病较重,表现感病。     

某场"耳尖发紫、全身发红"猪病诊疗体会

辽宁某猪场猪群发生“耳尖发紫、全身发红”的猪病，已经流行一个月之久，死亡数百头，经多方诊治，病情尚未控制。次日猪场送检4头典型病例患猪，由笔者汇同有关专家进行诊断。     

Transplantation Therapy of Cats with Chronic Renal Failure

Dialysis therapy is not a radical cure of chronic renal failure in cats,while renal transplantation is the cure method.Renal transplanta-tion requires rigorous examination of donor and receptor,and the procedure is strictly sterile.The main points of renal transplantation are:renal artery and vein sutured to abdominal aorta and posterior vena cava,respectively;ureter sutured to bladder;minimizing the time of thermal ischemia.Cats should be given immunosuppressant before the operation,and the drug should be administered throughout the life.Various indicators should be monitored regularly to prevent the occurrence of immunological rejection.     

Biallele Expression of PEG10 Gene in Primordial Germ Cells Derived from Day 27 Porcine Fetuses

Primordial germ cells (PGCs) from day 27 porcine fetuses have often been isolated to establish pluripotent embryonic germ (EG) cell lines, but little is known regarding their imprinted gene status. In our study, we attempted to detect the imprinted gene expression of cloned embryos and EG cells derived from individual PGC of day 27 and day 35, using single nucleotide polymorphism (SNP) analysis of the paternally expression gene 10 (PEG10) as a sign of parental‐origin‐specific expression. The results showed biallelic gene expression of the SNP that occurred in EG cell colonies and almost all of the cloned blastocysts, demonstrating that aberrant imprinted gene expression of PEG10 occurs in the day 27 porcine PGCs, whereas monoallelic expression of the PEG10 gene occurs in all the PGC clones derived from day 35 PGCs. In addition, the same imprinted gene status was observed for blastocysts derived from both male and female PGCs, indicating that the parental genomic imprinting is erased in male and female germlines.     

青壳蛋遗传规律初探

为了研究青壳蛋遗传规律,我们对青壳蛋鸡进行了四个世代的选育。二、三、四世代产青壳蛋及非青壳蛋母鸡个数分别为205,22;258,17;635,15;与计算出的理论数据206.21;260,15;636,14经卡方检验差异不显著。对一世代、三世代进行测交,其后代产青壳蛋与非青壳蛋母鸡个数分剐为613,463;706,236;与通过一世代、三世代的显性基因频率与隐性基因频率计算出的理论数据600,467;707,235经卡方检验差异不显著。选择加快了群体基因频率的改变,青壳蛋性状确为由一对主效基因控制的完全显性遗传性状。