Evaluation of rabbit excreta as an ingredient in broiler diets

1. Dry rabbit excreta were found to contain 188.1 g crude protein, 6.6 g non‐protein nitrogen, 0.3 g ammonia, 89.8 g moisture, 8.0 g ether extractives, 135.2 g crude fibre, 266.9 g ash and 19.18 MJ gross energy/kg. Methionine and lysine contents were 3.95 and 4.29 g/100 g protein, respectively.

2. In one experiment, 0, 50, 100 or 200 g rabbit excreta/kg were substituted for maize in a broiler diet. Chickens receiving the diet containing 200 g rabbit excreta/kg gained significantly less weight to 8 weeks of age than those receiving other diets.

3. In a second experiment, 0, 100, 150 or 200 g rabbit excreta/kg were substituted primarily for maize in a broiler diet to provide equal energy and protein contents. Weight gains to 8 weeks of birds receiving these diets did not differ significantly. The uncorrected metabolisable energy content of the excreta was 9.15 MJ/kg.

4. There were no gross pathological changes in the birds fed on the experimental diets.     

不同倍性西瓜的叶表皮微形态特征比较

扫描电镜观察结果表明,随着西瓜倍性的增加,叶片保卫细胞和表皮细胞增大,叶片单位面积上的气孔和表皮细胞的数目减少,细胞的大小与西瓜倍性呈正相关,单位面积上的细胞数目与西瓜倍性呈负相关。通过FDA荧光记数法观察,4x、3x和2x的叶片保卫细胞中的叶绿体数目分别为19.9±3.4,15.9±2.2,11.5±1.5,其比例约为4∶3∶2,与西瓜的倍性一致。根据此方法可以快速有效地对西瓜倍性进行早期鉴定。     

武定鸡红细胞免疫功能研究及其意义

应用红细胞Ｃ３ｂ受体花环（Ｃ３ｂＲＲ）和免疫复合物花环（ＩＣＲ）试验,证实武定鸡红细胞表面存在补体Ｃ３ｂ受体（Ｃ３ｂｒｃｃｃｐｔｏｒ,Ｃ３ｂＲ）,表明红细胞免疫系统（Ｒｃｄｃｃｌｉｍｍｕｎｅｓｙｓｔｅｍ,ＲＣＩＳ）的概念亦适用于这种动物。武定鸡的ＲＣＩＳ有其独特之处,文中对武定鸡红细胞Ｃ３ｂＲＲ和ＩＣＲ分别代表红细胞表面Ｃ３ｂ“空位”和“占位”状态的含义做出了新的解释。     

两个SNP位点的遗传多样性及其与鸡生长性状的关联

试验分析了1号染色体上2个SNP位点(rs15279778、rs14837036)的多样性及其与鸡生长性状的相关性.结果表明:rs15279778和鸡的早期生长性状显著相关,其对表型方差的贡献率均值为11.65%.rs15279778可应用于鸡早期生长性状的标记辅助选择.     

Real-time adaptive irrigation scheduling under a limited water supply

The problem of real-time irrigation scheduling under limited water supply is considered. The goal is to develop an irrigation operation policy which maximizes crop yields and is responsive to current season changes in weather and other variables. Because irrigation decisions are sequential and dependent on crop and soil water status, and also because crop yields can only be known at the end of the season, the decisions are arrived at by a two-stage process. In the first or the design stage, irrigations are planned for the entire season at weekly intervals using historical data and an optimal irrigation scheduling model. In the second stage, the decisions for the subsequent weeks are revised each week after updating the status of the system with real time data up to that week and solving the irrigation optimization model once again for the new conditions. Thus, each week an irrigation decision is made, the entire planning horizon is kept in view. The procedure is illustrated by application to a case study.     

江苏地区小麦赤霉病菌种群检测与抗药性分析

本研究旨在检测江苏地区小麦赤霉病菌的种群组成与对传统杀菌剂单剂的抗性严重度。以江苏溧阳、通州和盐城地区小麦赤霉病菌子囊孢子为试材,鉴定其优势种群,检测对多菌灵、戊唑醇和咪鲜胺的抗性。结果表明：江苏地区小麦赤霉病菌株中全部检测到亚细亚镰孢,是绝对优势种群;禾谷镰孢占比最高是溧阳地区的14%,最低是通州地区的8%,平均占比为11.33%,显著低于亚细亚镰孢占比;江苏地区小麦赤霉病菌对多菌灵的抗性频率介于26.3%~54.5%;未检测到戊唑醇和咪鲜胺具有抗性的赤霉菌株。综上,江苏地区小麦赤霉病菌优势种群是亚细亚镰孢,其对多菌灵单剂已产生严重抗性,未发现对戊唑醇和咪鲜胺产生抗性。     

黑果枸杞LrDREB1基因克隆及其在非生物胁迫下的表达分析

DREB(Dehydrate responsive element binding factor)转录因子是植物非生物逆境适应中的关键调节因子,该类转录因子具有保守的AP2/EREBP结构域,在低温、高盐等非生物逆境胁迫下,可调控下游逆境应答基因的表达,对增强植物的抗逆能力有重要作用。黑果枸杞具有极强的耐干旱、盐碱能力,为研究黑果枸杞DREB类基因在低温、盐碱响应中的功能,本研究以强抗盐灌木黑果枸杞总RNA为模板,基于前期转录组测序拼接序列,利用RT-PCR方法克隆得到一条DREB基因。该基因含有一个1116 bp的开放阅读框,编码372个氨基酸。系统进化树分析显示,Lr DREB1基因属于DREB亚家族A2组成员,与拟南芥AtDREB2B、AtDREB2E具有较高的相似性。荧光定量PCR结果显示,Lr DREB1受盐胁迫、ABA胁迫和低温胁迫诱导表达,可能参与依赖ABA的信号转导途径,调节黑果枸杞抗盐响应。本研究通过对黑果枸杞LrDREB1基因的克隆、序列分析和表达分析,为研究Lr DREB1的功能及黑果枸杞抗盐机理提供了帮助。     

浙南沿海羊栖菜繁殖生物学的初步研究

本文研究了羊栖菜的有性生殖和营养繁殖。前者包括生殖托的发生、精卵的排放及合子的发育与环境因子的关系。后者主要为定株观察假根再生芽的发生。本研究为羊栖菜的人工育苗和资源保护提供了科学依据。     

计算法测量电阻应变原理的试验分析

介绍了计算法测量电阻应变的原理及试验,着重分析了试验结果,验证了测量原理．