不同添加剂对笋壳青贮品质和营养价值的影响

本试验通过添加不同种类的青贮剂研究其对笋壳青贮品质和营养价值的影响。试验共5组,即对照组(CK),原料直接青贮;A组:加玉米粉10%;试验B组:玉米粉和乳酸菌(10+0.001)%;C:添加3种酸(甲酸∶乙酸∶丙酸=80∶11∶9),混合液0.3%;D组:甲酸和甲醛混合液3%(85%～90%甲酸和37%～40%甲醛混合比为1∶1),塑料袋抽真空密封青贮45 d。并于青贮第3,5,8,15,23,30和45天分别取样。结果表明,笋壳单独青贮时pH值均达4.50以上,氨态氮占总氮比例高达22.83%,营养物质损失大,青贮效果不理想。添加玉米粉,玉米粉+乳酸菌,有机酸,甲酸+甲醛后笋壳青贮的pH值、氨态氮占总氮比例均显著低于对照组(P<0.05),4种添加剂处理均能显著提高粗蛋白、干物质及乳酸含量(P<0.05),可使笋壳青贮的发酵品质和营养价值得到改善。各处理中乳酸含量均高于乙酸、丙酸和丁酸,各添加剂均可显著提高乳酸含量并降低乙酸、丙酸和丁酸含量(P<0.05),青贮品质和营养价值各处理组优劣顺序为B>A>D>C>CK;青贮前8 d是影响青贮品质和营养价值的重要时期。     

中药添加剂对断奶仔猪生产性能和腹泻率的影响

选取28日龄体质量相近的杜长大断奶仔猪72头,随机分成4个组,每组3个重复,每个重复6头,各重复公母猪各半进行28 d的饲养试验,试验共设对照组(基础日粮)、中药I组(基础日粮+1%中药配方I)、中药II组(基础日粮+1%中药配方II)、抗生素组(基础日粮+抗生素)4个处理,研究中药添加剂对断奶仔猪生产性能和腹泻率的影响。结果表明,饲粮中添加中药和抗生素提高了断奶仔猪的平均日增质量(ADG)(P>0.05),中药II组和中药I组显著改善了料肉比(P<0.05),抗生素组也有不同程度的改善(P>0.05);各试验组显著减小了仔猪腹泻的持续时间和腹泻频率(P<0.05),中药II组极显著降低了腹泻频率(P<0.01),显著降低了腹泻指数(P<0.05),而抗生素组和中药I组的腹泻指数与对照组相比无显著差异(P>0.05)。     

木粉/PVC复合材料挤出流动性的影响因素

研究木粉的粒径、添加剂的种类及配比等因素,对木塑复合材料挤出流动性的影响.结果表明:木粉粒径越小,复合物料在挤出过程中的流动性能越差,所制备的木塑复合材料色差越大,且产品材色越深.综合考虑加工特性和制品材色,宜选用木粉粒径45～60目;并添加稀土热稳定剂及铝酸酯偶联剂,可以提高物料的挤出流动性.     

变分不等式的加性广义Schwarz算法

将加性广义Ｓｃｈｗａｒｚ算法推广到求解变不等式，并在适当条件下证明了其收敛性。     

草原蝗虫开发利用的研究

青海草原环湖及柴达木蝗区大部分地面平缓，宜于机械作业。蝗虫种群密度８０～１２０头／ｍ２者居多，面积为４０～５０万ｈｍ２，贮量小年为４８４０Ｔ，大年为６５６０Ｔ，开发前景广阔。蝗虫粉含粗蛋白７４．８８％，居我国目前优良饲料之首。经试验，作为饲料添加剂与５０％的进口鱼粉比较，京黄１号７日龄肉仔鸡饲喂４９天后成活率为８８．７１％，体重平均增长１０２０．２ｇ，二者差异不显著；星杂二八八６～８月龄蛋鸡饲喂后产蛋量提高１８．０８％，产蛋率提高７．９９％，完全可以代替鱼粉。新研制的捕蝗机捕蝗率为６５．０～７４．２％，生产率２．７４ｈｍ２／ｈ，单机捕幅４ｍ。以１９９３年的市场价格为准，机捕的经济效益为２８．６０元／ｈｍ２，且有突出的社会和生态效益。     

毛细管区带电泳测定饲料添加剂中酪蛋白磷酸肽含量的方法研究

利用毛细管区带电泳(CZE)对饲料添加剂中酪蛋白磷酸肽(CPP)样品进行分离，结果显示，用四硼酸钠缓冲溶液(20mmmol/L,pH9.2)及50cm×70μmi.d.石英毛细管柱，在工作电压30kV、检测波长200nm、柱温25℃的条件下，CPP得到较好的分离；同时，采用外标法对饲料添加剂样品中CPP各组分的含量进行了测定。     

中草药添加剂强力速补的抗应激试验研究

以中草药为主体的饲料添加剂强力速补,具有提高蛋鸡产蛋率的作用。以250%的强力速补药液0.2ml/10g给小白鼠灌胃,观察在寒冷、高温、缺氧条件和水浴中小白鼠的存活时间。结果显示试验组小白鼠存活时间明显长于对照组P<0.01或P<0.05,说明强力速补对机体具有良好的抗应激效应。     

The Influence of Genotype–Environment Interaction on the Grain Yields of 10 Pigeonpea Cultivars Grown in Kenya

To study the importance of the effects of genotype–environment interactions on the yield of pigeonpea ( Cajanus cajan L. Millsp.), 10 early-maturing genotypes were grown in a randomized complete block design with three replications in a total of seven environments spread over five regions of Kenya between 1987 and 1988. Results indicated the presence of a substantial genotype–environment interaction effect on grain yield. The observed significant genotype–environment interaction effect is discussed in relation to its importance in pigeonpea grain yield evaluation studies. It is noted that the best genotype in one environment is not always so in other environments. Results from regression analysis indicated that this method of analysis is appropriate for describing the response of pigeonpea genotypes grown in a number of locations. Analysis of variance showed significant additive and multiplicative genotype–environment interaction effects. Only the first interaction principal component axis (IPCA) was found to be important in describing the multiplicative interaction effects. The additive main effects and multiplicative effects (AMMI) model allowed the partitioning of interaction variance into agronomically important sources (genotype groups), and the specific genotype × environment patterns that are the basis of these sources of variance were examined.     

中药饲料添加剂对法国肉用鹌鹑增重及肉质的影响

用1周龄法国肉用鹌鹑120只,随机分成4组,每组3个重复,每个重复10只.第1～3组为试验组,分别在基础日粮中添加1％的党参、0.5％党参 0,5％黄芪、0.5％党参 0.5％艾叶,第4组为对照组.试验期为2～6周龄,共35d,每7d称重一次.试验结果表明,各试验组的增重与对照组相比,差异均显著(P<0.05);其中第3组效果最好(P<0.01).日粮蛋白质表观代谢率和料肉比,试验组均优于对照组(P<0.05).各组间的肌肉概略养分、pH值和胴体品质,除第1组的屠宰率略高外(P<0.05),其余差异均不显著(P>0.05).嫩度值差异极显著(P<0.01).血清总蛋白质和A/G差异不显著(P>0.05),但血糖含量差异较大(P<0.01).     

Sulphate Attack Resistance of the Concrete with Additives and Its Assessment

The influence of three kinds of additives: silica fume,slag and fly ash on the sulphate attack resistance of concrete were studied.The experiment results show that these three kinds of additives can improve sulphate attack resistance of the concrete and the order of their efficiency from high to low is silica fume,slag and fly ash;the development of mortar expansion value is closely related to the degree of sulphate attack resistance of the concrete;integrated assessing two concrete properties: mortar expansion value and compressive strength ratio can more exactly assess the sulphate attack resistance of the concrete.