西杂牛产奶性能分析及提高产奶量的措施

本文对烟台西杂牛的产奶性能进行了分析,找出了差距及存在的潜力,提出了提高产奶量的措施 。     

Effects of Clenbuterol,Genotype,and Feeding Method on Bodyweight Gain of Meat Rabbits

Four-factor and three-level orthogonal experimental design(L9(3^4)) was used in the experiment.The effects of three genotypes:germany SAB three-bred-cross rabbits(S2),New Zealand purebred (N),and crossbred rabbits (ON);three levels of Clenbuterol treatment:1 ng.g^-1,2 ng.g^-1 and 3 ng.g^-1,and three feeding methods:5-day,7-day and 10-day withdrawal period after two weeks of feeding Clenbuterol(CL) on bodyweight gain were evaluated.CL apparently improved average daily gain (ADG) of rabbits.70-day ADG of 5-day and 10-day withdrawal were higher than that of 7-day withdrawal,70-day ADG of S2 genotype was significantly higher than that of the control and N geknotype was significant.Genotype,additive dose and feeding method had significant effects on overall-stage ADG.ON genotype,2 ng.g^-1 dose and 5-day withdrawal feeding method was the best.Responses of different genotype to Clenbuterol appeared different at experimental prophase or whole experimental period.     

Aromatic Acids and Leucine Derivatives Produced from the Deep-Sea Actinomycetes Streptomyces chumphonensis SCSIO15079 with Antihyperlipidemic Activities

Six new aromatic acids (1–6) and three new leucine derivatives containing an unusual oxime moiety (7–9) were isolated and identified from the deep-sea-derived actinomycetes strain Streptomyces chumphonensis SCSIO15079, together with two known compounds (10–11). The structures of 1–9 including absolute configurations were determined by detailed NMR, MS, and experimental and calculated electronic circular dichroism spectroscopic analyses. Compounds 1–9 were evaluated for their antimicrobial and cytotoxicity activities, as well as their effects on intracellular lipid accumulation in HepG2 cells. Compounds 3 and 4, with the most potent inhibitory activity on intracellular lipid accumulation at 10 μM, were revealed with potential antihyperlipidemic effects, although the mechanism needs to be further studied.     

南方集体林区人工用材林按面积限额进行采伐管理的改革探索

针对南方集体林区林权制度改革后人工用材林的经营特点,提出在南方集体林区实施按面积限额进行林木采伐控制管理,并在分析按面积限额进行采伐管理重要意义的基础上,进一步阐述了按面积限额进行采伐管理的实施办法和相应的配套措施。     

集体林权制度改革后林木采伐管理面临的问题及对策

随着林权制度改革的不断深入,发现了采伐纠纷、伐区监管困难、指标难以落实、林木采伐管理各种矛盾日益突显等问题,亟待解决。在深入调研的基础上分析了林权制度改革后林木采伐管理面临的问题,提出相应管理对策,为林业决策和管理部门提供参考和借鉴。     

珍珠长毛兔生长发育特性的研究

从珍珠长毛兔Ｆ４、Ｆ５选育群中，随机选出５７４只，对其生长发育进行测定，结果表明，在相同的环境中，该兔Ｆ４和Ｆ５代生长发育的各项指标差异不显著（Ｐ＞００５），该兔早期生长发育快，４０日龄断奶至３月龄，平均日增重４４２８ｇ，３月龄体重３２ｋｇ。８月龄体重４３ｋｇ，体型大，产毛量高，８月龄第３次剪毛时为３５５ｇ（９０ｄ养毛期），估计年产毛量１４２０ｇ。粗毛率为２２％。     

祁连山典型灌丛植物根系化学计量特征及其与土壤理化因子的关系

为了揭示植物根系养分含量及其化学计量特征与土壤因子之间的关系,选择祁连山大野口流域的甘青锦鸡儿(Caragana tangutica)、鲜黄小檗(Berberis diaphana)、金露梅(Potentilla fruticosa)、鬼箭锦鸡儿(Caragana jubata)和吉拉柳(Salix gilashani...     

章鱼(Octopus)及头足类(Caphalopoda)的生产和消费对章鱼养殖的影响

通过对世界章鱼及头足类的生产和消费进行分析发现，阿根廷、摩洛哥、日本是头足类主要生产国，其中，摩洛哥、日本是章鱼主要生产国。世界的头足类消费国主要为日本、韩国、阿根廷等，其中日本是章鱼的主要消费国，其次为韩国等。上世纪章鱼产量逐渐提高．2000年达到顶峰。此后逐年下降，价格逐渐上扬。头足类。特别是章鱼的消费，与地区性和民族性有关，地中海区域及东亚和东南亚是消费章鱼及头足类的主要区域。头足类，特别是章鱼的消费，与国家的经济发展水平有关。随着东亚及东南亚，特别是中国的经济发展，头足类，特别是章鱼的消费量将逐渐增大。为了解决资源减少和消费量增大的矛盾，进行章鱼的人工养殖将是必然．作为世界加工厂的中国。为了满足逐渐增大的章鱼加工原料的需求，更应该进行真蛸的研究和养殖。     

垂直轴风力机概述

指出了风力机分为水平轴风力机与垂直轴风力机,随着对风能利用率要求的提高,垂直轴风力机以其独特的优势逐渐成为风力研究的重点领域。介绍了垂直轴风力机的主要类型、简要的发展历程以及国内外学者目前的一些研究现状,分析了垂直轴风力机发展所遇到的一些问题及今后可行的研究方向。