植物甾醇和甾烷醇降胆固醇作用机理研究进展

本文介绍了植物甾醇和甾烷醇的性质、来源、代谢及其降胆固醇作用和作用机理.     

龙岩地区部分猪场弓形虫病的血清学调查

通过间接血凝(IHA)试验对采自龙岩地区12个猪场的2055份猪血清进行弓形虫病的抗体检测,结果表明猪弓形虫病在龙岩地区呈散发性流行。样品阳性率为5.99%,各猪场之间的抗体阳性率有一定差异,最高为16.22%,最低为0。在母猪群中随着胎次的增加,弓形虫病抗体阳性率也升高,由1～2胎的6.72%上升到5胎以上的12.18%;育肥猪群总体弓形虫病抗体阳性率较低,由哺乳仔猪的10.94%缓慢降至育肥猪的1.62%,呈现出随日龄增加弓形虫病抗体阳性率逐渐降低的趋势。     

犬常见皮肤病的日常诊护

犬皮肤病是犬临床诊治中常见病之一。犬因品种、年龄、个体、营养、生活环境等不同而引起的皮肤病有很大的差异。本文就几种常见的犬皮肤病的不同的临床症状进行了简要综述,旨在给饲养者提供一些早期的、简单的鉴别及诊断,能尽快做出相应的预防和护理措施,并及时就诊。     

我国居民肉类消费情况调查

为更好研究落实2020年中央1号文件作出的决策部署,对居民肉类消费情况进行了调查。本次调查对全国30个省(区、市)各年龄层次、收入水平的1 060名居民,进行了猪肉、牛肉、羊肉、禽肉、水产品等肉类消费情况和习惯摸底。结果显示:2019年我国居民日常猪肉消费量有所降低,但猪肉仍是主要肉类消费产品;居民喜食热鲜猪肉的消费习惯已发生变化,对冷鲜猪肉接受度较高,对冷冻猪肉接受度低;卫生安全和价格是影响居民对猪肉消费决策的主要因素。可考虑从创新检疫工作模式,重点扶持"养殖-屠宰-销售"一体化企业,强化冷冻肉技术研发和推广,利用新媒体进行舆论引导等4个方面,进一步提高居民对冷鲜、冷冻肉品的认可度,为未来推动从"调猪"向"调肉"转变提供良好的市场环境。     

江苏省蚕桑综合利用模式分析

本文阐述了蚕桑综合利用是提高蚕桑产业经济效益的重要途径之一.江苏省是蚕桑生产大省,桑、蚕及其附属物和衍生物资源丰富,综合利用的潜能很大.文章结合江苏省蚕桑综合利用实际,分析蚕桑综合利用几种发展模式及经济效益.分析了当前江苏省蚕桑综合利用存在的主要问题,提出了蚕桑综合利用发展建议.     

Evaluation of immunogenicity and protective efficacy of Actinobacillus pleuropneumoniae HB04C(-) mutant lacking a drug resistance marker in the pigs

Previously, we reported the construction and characterization of a genetically defined Actinobacillus pleuropneumoniae (A. pleuropneumoniae) apxIIC gene mutant, HB04C(-), which conferred protection to mice against infection with A. pleuropneumoniae. In this study, we further evaluated HB04C(-) for safety and its ability to elicit protective immunity in pigs. It was demonstrated that a dose of 2 x 10(8) CFU HB04C(-) was safe to the pigs via intranasal or intramuscular injection. Immunization with a dose of 2 x 10(8) HB04C(-) by both intranasal and intramuscular routine could yield equal protective efficacy and elicited significant protection against experiment challenge with homologous or heterologous serotypes of a virulent A. pleuropneumonia. Taken together, HB04C(-) might serve as a promising vaccine candidate against infection with A. pleuropneumoniae.     

氯鼠酮钠盐防治布氏田鼠研究

氯鼠酮钠盐是国内近年合成的抗凝血杀鼠剂,用它对草原主要害鼠布氏田鼠作了毒力测定。急性LD_(50)为1.882±0.7537毫克/公斤,回归方程y=2.2476x+4.3826;慢性LD_(50)为0.20±0.0302毫克/公斤,回归方程y=2.4396x+6.7051。用0.004％、0.008％和0.016％氯鼠酮钠盐小麦毒饵作了现场灭鼠试验,其效果分别为75.83±5.90％、70.81±5.96％和98.41±4.62％。用氯鼠酮钠盐防治布氏田鼠一次投饵时宜用浓度为0.01％～0.016％。     

Seroprevalence of chlamydial infection in dairy cattle in Guangzhou, southern China

Chlamydia spp. are obligate intracellular gram-negative bacteria that cause a wide range of significant diseases in humans and animals worldwide, resulting in significant economic losses. Chlamydial infection in cattle has been reported in many countries including China. However, there has been no survey of chlamydial infection of dairy cattle in Guangzhou, southern China. The objective of the present investigation was to examine the chlamydial seroprevalence in dairy cattle in Guangzhou, subtropical southern China by using an indirect hemagglutination assay (IHA). The overall seroprevalence of chlamydial infection in dairy cattle was 7.25% (29/400). Greater than or equal to eight-yr-old dairy cattle had the highest seroprevalence (10.34%), followed by those that were ≥ 6 years old or < 7 years old dairy cattle (10.20%), although there were no statistically significant differences among different groups (P > 0.05). Dairy cattle with 5 pregnancies had the highest seroprevalence (10.81%). These results indicate that chlamydial infection was present in dairy cattle in Guangzhou, subtropical southern China, and integrated strategies and measures should be executed to control and prevent chlamydial infection and disease outbreak in the study region.     

正安县山羊主要疫病血清抗体检测报告

为了解正安县山羊主要疫病的发展趋势,通过虎红平板凝集试验、正向间接血凝试验、酶联免疫吸附试验等方法对正安县引进山羊进行布鲁氏杆菌病、O型口蹄疫、AsiaI型口蹄疫、山羊传染性胸膜肺炎、山羊痘等主要疫病血清抗体的检测。结果表明,O型口蹄疫、AsiaI型口蹄疫和山羊痘免疫抗体阳性率分别为79．42％、81．18％和99．58％,未免疫的布鲁氏杆菌病、羊传染性胸膜肺炎的丝状支原体山羊亚种和绵羊肺炎支原体未免疫抗体阳性率分别为0％、0％和3．81％。监测结果为山羊健康的引进、培育和扩繁提供了一些基础数据,对指导养羊生产有一定的意义。     

微生态营养素对鱼苗池浮游生物的影响

通过在鱼苗培育过程中使用微生态营养素和传统养殖模式进行对比,分析测定养殖环境中的浮游生物种类、数量和生物量以及透明度等理化因子,研究微生态营养素在苗种培育中的使用效果。研究结果表明:微生态营养素能有效促进浮游生物的生长,施放微生态营养素的水体中鱼类喜食且易消化的浮游植物及浮游动物的种类和数量显著增加,总生物量提高了20%~58%,水体透明度降低了30%～52%,培育出来的苗种,较常规培育的个体更大、成活率更高。