广东省蚕种生产微粒子病防控技术研讨会在罗定召开

2008年11月27～28日,广东省蚕学会蚕病理生理学组在罗定市召开了“广东省蚕种生产微粒子病防控技术研讨会”,来自省内产学研17家单位74位代表和省蚕学会姚宏中理事长和毛铿祖秘书长参加了本次研讨会。会上17位代表进行了交流,会议紧紧围绕我省蚕种生产中如何有效控制家蚕微粒子病的发生展开了热烈的经验交流和学术讨论。会议由蚕学会蚕病理生理学组组长廖富菽教授作了动员,     

近年家蚕新品种性状

优良蚕品种是发展蚕业生产的重要物质基础之一,是最经济、最有效的增产增效措施.为此各政府和蚕业部门都十分重视新蚕品种的选育和优良蚕品种的推广.据不完全统计,2001年至今,全国育成家蚕新品种大约25对左右.这次收集了近年育成的8对新蚕品种,很有意义的,它们全部为多元杂交种.众所周知,家蚕杂交优势明显,杂交原种的强健性大于原种是普遍规律,因而采用多元杂种是解决原种难养和提高产卵量的一条有效途径,也是今后培育家蚕新品种的一种趋势.     

“现代桑树学科发展研讨会”在西南大学召开

正2014年11月7日,西南大学家蚕基因组生物学国家重点实验室成功召开"现代桑树学科发展研讨会"。来自中国蚕学会、农业部种植业司、中国农业科学院蚕业研究所、广东省农科院、浙江省农科院、广西壮族自治区蚕业技术推广总站、浙江大学、西北农林科技大学、苏州大学、山东农业大学、安徽农业大学及西南大学共计40余位蚕桑学专家出席会议,专题讨论研究     

塑料蚕匾在广西家蚕原种繁育中的应用及分析

为了探索广西家蚕原种繁育中省力化的新技术,分析了塑料蚕匾在广西家蚕原种繁育中的应用,研究塑料蚕匾在小蚕、大蚕、上蔟采茧、种茧保护运输以及制种等多个时期的应用。通过对塑料蚕匾与竹蚕匾在物资成本、劳动力成本和操作应用等方面的对比,体现出塑料蚕匾在家蚕原种繁育中具有物资成本低、大蚕期劳动力成本稍高、耐用易消毒和实用性高等优点;同时对应用塑料蚕匾存在的问题,提出改进意见及今后的发展方向。     

浅谈提高原种质量

目前家蚕良种繁育制度是三级繁育四级制种,由原原母种择优选留母种同时生产原原种,由原原种生产原种,再由原种生产一代杂交种。所以原原种质量的好坏在很大程度上影响到原种生产质量。我所近年来,始终注重原种质量的提高,取得了较好的成绩,繁育数量逐年增加,蚕种质量不断提高。生产的陕蚕系列原种品种纯正、卵质充实、不良卵少、孵化率高、无毒。在生产过程中我们主要抓了以下几方面的工作。     

家蚕新品种贵蚕4号原蚕饲养及制种的试验调查

为了解家蚕新品种贵蚕4号(781.薪杭×7532.科明)的原种性状,以菁松、皓月、871、872为对照,在春秋季对贵蚕4号原种781×薪杭,7532×科明进行饲养及制种比较,结果表明:该组合原种饲育成绩较对照优良,制种成绩高,卵质优良。     

蚕业信息传播研讨会在广西北海召开

2014年6月24日，由中国蚕学会主办，广西壮族自治区蚕业技术推广总站承办的蚕业信息传播研讨会在广西北海市召开。来自国内10多家蚕业期刊和蚕业（农业）信息网站的编辑、管理和技术人员近40人参加了会议。     

新型蚕药"蚕病清"药效对比试验

蚕病清是广东省农业科学院蚕业研究所研制生产的新一代蚕药,主要成份为烟酸诺沙星.据报道,该蚕药对预防和治疗家蚕细菌性病害具有明显的效果,是现用蚕药氯霉素的替代药品.为了了解其在家蚕饲养中的实际应用效果,为江西省引进推广使用提供可靠的理论依据,2003年晚秋安排了一次药效对比试验,现将试验的有关情况报告如下.     

管理与技术结合 保持蚕品种性状

选原种工作担负着繁育良种和保持品种种性的双重任务，鉴于原原种、原种繁育的特殊性和重要性，我省一直把原原种、原种作为资源来统一管理。保持品种的优良生产性能，延迟品种使用年限，充分发挥蚕品种资源的效益和作用，是提高蚕茧单产和质量的关键，是蚕业管理部门和选原种工作者的重要工作内容。     

西昌试繁三眠蚕品种“伏·9×湘·7”简报

家蚕新品种"伏·9×湘·7"是由广东省蚕业技术推广中心育成的强健优质细纤度三眠四元杂交蚕品种。该品种具有体质强健,抗高温多湿、蚕种繁育系数高、好饲养、叶丝转化率高的特点,其茧丝质性状优良,可缫制6A级高品位生丝,非常适合优质蚕茧生产。西昌市蚕种场在2018年正秋引进三眠蚕"湘·7"、"伏·9"原种各一张28蛾圈,使用自有桑园进行饲养繁育试验。     

猪毛色遗传的研究进展

本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。     

癸氧喹酯干混悬剂含量测定的改进

采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。     

商会自治的基石——商会自治规范研究

在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。     

Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF

Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo.     

中华人民共和国农业部公告 第267号

为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …     

鸡败血支原体垂直传播模式及其阻断方法

以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。     

Mechanism of Action of Probiotic Function of Lactobacilli

乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制.     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air.