黄·海×苏·春的性状及饲养技术

家蚕黄·海×苏·春品种又名5·4×24·46,该品种是一对强健好养、茧形大、产茧量高、丝质优良的春用多丝量四元杂交种,1999年在射阳县首次引进饲养,经过1999年至2001年筛选对比试验,证明黄·海×苏·春薪品种适合射阳县春蚕期大面积推广应用.从1999年起,黄·海×苏·春品种射阳县饲养量逐年增加,目前推广率达60%左右.由于该品种有许多饲养环节与老品种苏5×苏6有一定的差异,特别是有些技术处理不当,仍按苏5×苏6品种的饲养方法去做,对产量和质量有很大的影响.为发挥该品种的增产潜力,提高经济效益,针对该品种的性状,就近几年来的实践谈几点做法供参考.     

香×苏F2代杂交猪屠宰性状、肉质性状及脏器系数的测定

为了研究香×苏F2代杂交猪的杂交性能,试验随机选取6月龄的香×苏F2代杂交猪15头,以纯种苏太猪和纯种从江香猪为对照,进行屠宰性状、肉质性能及脏器系数的测定。结果表明:香×苏F2代杂交猪屠宰性状与从江香猪差异极显著(P0. 01),优于从江香猪而劣于苏太猪;香×苏F2代杂交猪肌肉失水率、肌内脂肪含量与从江香猪、苏太猪差异极显著(P0. 01);香×苏F2代杂交猪肝脏、脾脏和肾脏系数与从江香猪和苏太猪均差异显著(P0. 05)。说明香×苏F2代杂交猪既发挥了苏太猪生长速度快、瘦肉率高的特性,又基本上保持了从江香猪的优良肉质特性。     

夏秋用蚕品种诸5、诸6的选育

我们经过几年的努力,选育出诸5、诸6夏秋用品种,兹将诸5、诸6的选育及其一代杂种鉴定的概况简述于后。首先,依据选育目标选配亲本,即以综合性状优良的现行夏秋用品种东34、苏12为基础,与现行春用品种华合、东肥分别配成中系东34×华合为诸5,日系苏12×东肥为诸6。这样选配的设想是,使华合、东肥较强的配合力和丰产性的基因,通过杂交,分     

2018年春季湖北蚕区桑蚕新品种实验室鉴定报告

2018年春季,以菁松×皓月作为对照,对苏婴×熙阳、鲁87×鲁88、Z831×Z842共3对桑蚕新品种进行了实验室鉴定。观察了解新品种在催青、饲养中的性状表现,调查这几对品种的茧质及丝质成绩,概述其综合经济性状。     

2017年春季北方蚕区桑蚕新品种实验室鉴定 (安康点)报告

2017年春季,对桑蚕品种苏婴×熙阳进行了实验室鉴定.结合蚕期表现、茧期调查、丝质鉴定等,总结参鉴品种在安康试验点的饲育情况和性状特点.     

多丝量蚕新品种"和山1号"的育成

以菁松、皓月为基本骨干,配制四元杂种,通过配合力测定,选育出"和山1号"新品种.杂交种实验室鉴定"和山1号"四元杂交万蚕产茧量21.49 kg、万蚕产茧层量5.093 kg,鲜茧出丝率18.4%分别比对照种菁松×皓月高7.40%、11.03%和4.66%;解舒率、纤度、净度、解舒丝长等主要丝质成绩与对照种菁松×皓月相仿,是一对高产、优质、好养、茧形匀正,综合经济性状优良的多丝量蚕新品种.     

绵羊FGF5基因Exon 3多态性对毛用性状的影响

为探寻不同细毛羊品种FGF5基因多态性及其对毛用性状的影响,采用PCR-SSCP方法对苏博美利奴羊和东北细毛羊两个群体的FGF5基因Exon 3区进行了多态性分析,并在苏博美利奴羊群体中对不同基因型个体与其毛用性状进行了差异显著性分析。结果表明:苏博美利奴羊群体FGF5基因Exon 3区存在5种基因型,分别是DD、EE、FF、DE和EF,而东北细毛羊群体只存在DD、EE和DE三种基因型;苏博美利奴羊F等位基因由CDs区c.618和c.733多态位点构成,其中c.733位点C-G突变导致E等位基因型个体氨基酸L-V变异。苏博美利奴羊群体只有FF基因型个体在产毛量指标上显著高于DD基因型个体(P0.05)。不同毛用绵羊品种FGF5基因多态性及其与毛用性状相关性的研究可为利用FGF5基因进行毛用性状选育奠定基础。     

蚕桑新品种苏12×苏13(及反交)性状及饲养要点

一、品种性状: 本品种是中国系统日本系统与二化性多丝量品种的一代交什种,经过五九、六零年两年试养证明可以在广东第一造和第七造饲养。丝量、丝质此瀛文×华十还要优胜。 1.新品种苏_(12)×苏_(13)卵色全都黑褐色,孵化齐,一股分二天收蚁达95％左右,每张蚕种收蚁量达七公分以上。 2.斑纹是普通斑,刚饷食时油泽少,到盛食期油     

张杂谷替代玉米在育肥猪中的应用研究

为了拓宽张杂谷的应用渠道,在生猪育肥阶段开展了张杂谷替代部分玉米的试验研究。选择"杜×长×大"三元育肥猪,日粮中用张杂谷分别替代0、25%、30%、35%的玉米,研究其对育肥猪生长性能及胴体和肉质性状的影响。结果表明,替代比例为25%和30%时,育肥猪日增重高于对照组,分别提高了8.08%和8.36%,差异显著;料重比低于对照组,分别降低6.46%和4.76%;替代比例达到35%时,对育肥猪的生长性能产生了不利影响;对育肥猪胴体和肉质性状影响方面,3个试验组和对照组没有明显差异。综合考虑生产性能和经济效益情况,替代比例25%时最佳。     

2018年春季北方蚕区桑蚕新品种实验室鉴定(山西点)报告

2018年春,山西省蚕业科学研究院对9801×9802、鲁87×鲁88、苏婴×熙阳3对桑蚕新品种进行了实验室鉴定。这3对品种的茧层率、四项经济性状、上车率均高于对照品种,死笼率、普通茧重量百分率、解舒率均低于对照品种。苏婴×熙阳茧丝纤度细,缫丝成绩好。     

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。     

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。     

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.     

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.     

獭兔睾丸的组织学观察

家兔作为一种实验动物 ,推动了繁殖技术的发展。本试验通过对不同年龄公獭兔的睾丸进行组织学观察、测定 ,研究精子的发生规律 ,为系统地进行繁殖生理工作提供依据。1　材料与方法选 60日龄、75日龄、90日龄 3个年龄公獭兔各5只 ,用外科手术法摘取两侧睾丸 ,放入 Bouin氏液中固定 ,二甲苯透明 ,石蜡包埋 ,切成 5～ 8μm切片 ,H.E.染色。在显微镜下观察 ,并进行定量组织学指标测定及差异性比较。2　结果和讨论2 .1　睾丸定量组织学指标的测定结果　见表 1。表 1　獭兔睾丸定量组织学指标　　　μm,个 /精细管60日龄 75日龄 90日龄曲细精管…     

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。     

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.