仔猪腹泻防治效果观察

对怀孕母猪注射疫苗、投服药物,使其所产仔猪获得被动免疫,与此同时,对仔猪投服预防性药物,达到预防仔猪腹泻的目的.通过实践,使仔猪腹泻的发病率由35.65%下降到16.79%,死亡率由10.8%下降到0.98%,取得了较好的防治效果.     

马齿苋对断奶仔猪生长性能的影响试验

探讨了在玉米-豆粕型基础日粮中添加马齿苋对断奶仔猪生产性能的影响。试验选用性别相同、体重相近、日龄差异不超过2d的杜×长×大三元杂交断奶仔猪60头,随机分成5组,以马齿苋占日粮的1％、3％、5％、8％添加．结果表明：加入马齿苋可显著降低断奶仔猪腹泻率,促进仔猪生长,提高饲料利用率（P〈0．05）,且以5％添加量效果最好。     

太阳黑子活动与森林病虫害暴发成灾的分析

本文对太阳黑子活动与当地森林病虫害暴发成灾的相关关系进行了分析，在太阳黑子峰年和谷年前后，常引起病虫害的大发生。     

聚醚类抗生素——腐霉素发酵条件的研究

由吸水链霉菌 （Ｓｔｒｅｐｔｏｍ ｙｃｅｓｈｙｇｒｏｓｃｏｐｉｃｕｓ）ＨＳ－ ８６诱变获得的一株突变株Ｕ－５８,通过设计的多因子试验,确定了培养该菌株的最佳碳、氮源比,诸因子中影响最大的是淀粉,其次是蛋白胨、酵母粉。原材料对比试验中,淀粉以玉米淀粉最佳。锰离子对腐霉素产量的提高有显著的促进作用。在２．５ｔ发酵罐中通气培养９６～１２０ｈ,效价达到４ ０００μｇ／ｍ ｌ以上。     

Effect of Psammaplin A on in vitro Development of Bovine Aging Oocytes

To investigate the effect of histone deacetylation inhibitor Psammaplin A (PsA) on the development of bovine aging oocytes in vitro,oocytes were randomly divided into control group,aging group and 50 mmol/L PsA treated aging group (PsA group).Immunofluorescence staining and JC-1 were used to detect the blastocyst rate of bovine oocytes after parthenogenetic activation,the number of cells in blastocysts,apoptosis,reactive oxygen species (ROS),glutathione (GSH) and mitochondrial membrane potential intensity of embryos.The results showed that the blastocyst rate of the aging group was significantly lower than that of PsA and control groups (P<0.05).The blastocyst rate of PsA group was not significantly different from that of control group (P>0.05).The number of cells in the blastocysts of control group and PsA group were significantly higher than that of aging group (P<0.05).The number of cells in the blastocysts of PsA group was not significantly different from that of control group (P>0.05).The apoptosis rate in aging group was significantly higher than that of control and PsA groups (P<0.05),the apoptosis rate of PsA group was significantly higher than that of control group (P<0.05).The GSH level of MⅡ oocytes in aging group was significantly lower than that of control and PsA groups (P<0.05).There was no significant difference in GSH level between control and PsA groups (P>0.05).The ROS level of the embryos in aging group was significantly higher than that of control and PsA groups (P<0.05).The ROS level in PsA group was significantly higher than that of control group (P<0.05).The mitochondrial membrane potential of early embryos of aging group 4-8 cells was significantly lower than that of control and PsA groups (P<0.05).The mitochondrial membrane potential intensity of control group was significantly higher than that of PsA group (P<0.05).In summary,PsA could effectively delay the aging of bovine oocytes and improve the quality of oocytes.     

鹅细小病毒研究进展

小鹅瘟是由鹅细小病毒引起的一种急性、亚急性烈性传染病,是目前危害养鹅业的重要传染病之一。近年来关于鹅细小病毒的研究又有了新的发展和新的观点,作者从鹅细小病毒分子生物学、检测方法、致病机理和抗原位点的定位等方面进行了阐述。     

硫酸新霉素可溶性粉在靶动物猪的安全性研究

为了客观评价硫酸新霉素可溶性粉对靶动物猪临床应用的安全性,将32头仔猪随机分为4组,每组8头,分别设1倍、3倍、5倍临床推荐剂量组和空白对照组,连续混饮硫酸新霉素可溶性粉15 d,通过检测各组受试猪的临床表现、血液常规指标、血清生化指标、尿液常规指标及病理学变化等评价其临床用药的安全性。结果:硫酸新霉素可溶性粉以5倍临床推荐剂量内应用于靶动物猪后,对其临床症状、体重、血常规、血生化及尿常规等指标没有显著影响,解剖学及病理组织学检查也未见任何病理变化,说明硫酸新霉素可溶性粉以1倍、3倍、5倍临床推荐剂量应用于靶动物猪是安全的。     

饲料中添加酶制剂的作用

随着酶制剂的开发和利用,人们对不同种类的动物,不同的日粮类型作了大量的研究。结果发现饲料中添加酶制剂,除分解特定的底物外,还可最大限度地消除饲料中某些抗营养因子的抗营养作用,影响动物机体的内泌,增强免疫,改善动物生产性能,提高畜产品的产量和质量。     

鸡传染性脑脊髓炎的诊断

1999年7月,牡丹江市郊区兴隆镇的2户养鸡户饲养的褐壳新罗曼蛋鸡雏5 000只,在2～3日龄发生了以共济运动失调和头颈部震颤为主要特征的传染病.先后用氯霉素、庆大霉素、恩诺杀星、环丙杀星等药物治疗,均未见效,发病高峰为12～14日龄,发病率为57%,到3周末时死亡率为48%.     

植物黄酮在缓解奶牛热应激上的应用前景

奶牛是一种耐寒畏热的动物,当奶牛对环境温度的适应能力超过其阈值时就会产生热应激。热应激对奶牛的生产性能、抗氧化能力、免疫机制、内分泌和代谢产生不利影响,是阻碍奶牛业健康发展的一大问题。近年来,植物提取物作为一种兼具营养价值和保健价值的饲料添加剂被广泛应用。植物黄酮作为一种存在广泛的植物提取物,具有提高家畜生产性能和抗氧化能力、增强机体免疫力和抗炎能力、调节机体代谢等功效。因此,植物黄酮可以对症治疗奶牛热应激。本文将从热应激对奶牛生产性能、抗氧化能力、免疫机制、内分泌和代谢的影响以及近些年来将植物黄酮用于改善动物热应激的相关研究进行综述,以期为植物黄酮用于缓解奶牛热应激的深入研究提供理论支持。