种公鸡体形外貌及精液品质性状的聚类分析

本研究对种公鸡的体形外貌及精液品质共14个性状，用统计分析软件SPSS(Ver．11．0)进行了聚类分析，结果表明：在SPSS提供的聚类分析方法中，沃特氏(Ward’s method)聚类分析法把这些性状分为5类，能较全面反映性状实际情况。这一结果为种公鸡的体形外貌、精液品质的选育提供了科学依据。     

动物饲料国际贸易、养殖密度与环境氮磷平衡的关系

粮食和饲料的国际贸易促进了许多国家农业生产系统的专业化和集约化.专业化动物养殖越来越多地依赖进口大豆和玉米,虽然提高了动物生产力,但也促使作物和动物生产系统在空间上的分离.本文综述了几十年来全球范围内大豆和玉米的贸易变化,并将其与养殖密度和整个食品系统中营养平衡的变化联系起来.这一变化与不同的营养管理条例的差异和动物饲...     

四川猕猴桃灰霉病菌对4种杀菌剂的抗药性检测

为明确猕猴桃灰霉病菌对常见杀菌剂的抗药性状况,本试验于2016年-2018年调查统计了四川猕猴桃生产中防控灰霉病所用的药剂种类和施药频次,并从四川8个猕猴桃主产区采集病叶、病花和病果,经单孢分离获得122个灰葡萄孢Botrytis cinerea菌株,采用最低抑制浓度法(MIC)测定其对4种化学药剂嘧霉胺、咯菌腈、腐霉...     

取食不同猎物对黄带犀猎蝽生长发育和繁殖的影响

黄带犀猎蝽Sycanus croceovittatus可捕食多种害虫, 是农林业害虫生物防治的重要天敌昆虫?为评价黄粉虫Tenebrio molitor?果蝇Drosophila sp.?斜纹夜蛾Spodoptera litura和棉蚜Aphis gossypii 4种猎物作为规模化饲养黄带犀猎蝽的食物来源的效果, 在室内温度(25±1)℃, 相对湿度(60±5)%, 光周期L∥D=14 h∥10 h条件下, 测定了分别取食上述4种猎物的黄带犀猎蝽生长发育和繁殖的相关生物学参数?结果表明, 黄带犀猎蝽以这4种猎物为食均可完成1个世代, 且可以继续繁殖, 但猎物种类对其相关生物学参数有显著影响?取食斜纹夜蛾的黄带犀猎蝽成虫获得率(69.9±7.6)%, 若虫总历期(70.3±0.6) d, 产卵前期(21.5±0.5) d, 卵期(20.0±0.1) d, 单雌产卵量(213.4±22.7)粒, 卵孵化率(76.5±3.6)%?其若虫死亡率较低, 成虫获得率较高, 若虫发育历期最短, 各发育阶段的黄带犀猎蝽体重最重?与黄粉虫组相比, 其成虫产卵前期显著缩短, 卵孵化率显著提高, 但成虫寿命较短?说明斜纹夜蛾幼虫可作为室内扩繁黄带犀猎蝽的猎物?     

Research advances in genetics and breeding ofpopulus davidiana dode in China

In this paper a general introduction is given to research advances in genetics improvement and breeding of Chinese aspen (Populus davidiana Dode) in China. This introduction includes natural distribution and collection, conservation, gene diversity, provenance trial, crossing breeding, vegetative propagation and disease resistant etc. Based on the current situation of forest tree breeding in China, some strategic suggestions concerning the future development of Chinese aspen genetics improvement in China are presented, taking into consideration the existing domestic demands of forestry production and international trends in forest tree breeding. Responsible Editor: Chai Ruihai     

RAPD技术及其在农作物遗传育种中的应用

论述了RAPD技术的原理、意义及其在基因定位、遗传图谱的构建、亲缘关系和系统进化的研究、品种纯度的鉴定、体细胞杂种鉴定和目标基因的早期鉴定等方面应用于农作物育种的情况。由于RAPD技术简捷快速、花费少,虽有一定的局限性,但仍在基因组研究中发挥着不可替代的重要作用。     

新疆鬣蜥繁殖习性的研究

新疆鬣蜥Aga ina stoliczkana (Blanford)主要分布在塔里木盆地的边缘地区,1988年4—7月、9—10月,笔者在阿克苏农一师五团对其进行了野外定点观察,逐月共解剖标本80条,89年4月在室内解剖32条,合计112条(雌性58条、雄性54条),记录精巢、卵巢发育情况,将固定的精巢,做成石蜡切片,并结合人工饲养观察,对新疆鬣蜥繁殖进行了研究。     

KHAPLI在小麦抗病育种中的利用

普通小麦(Triticum aeslivum,2n=6x=42)与二粒小麦Khapli (T. dicoccum,2n=4x=28)杂交,因普通小麦品种不同,传递给杂交种的基因数也不同。抗贵白4号、16号和20号小种的两个显性抗白粉病基因,容易遗传给六倍体小麦遗传背景。抗贵白64号小种的可能有1个隐性基因,较难遗传给普通小麦的杂种后代。     

Privatization of Veterinary Services in Developing Countries: A Review

Increasing fiscal constraints on the government, a lackadaisical performance by public sector animal health and breeding services and pressure from donor partners have prompted the governments of various developing countries to rethink the role of the public sector in the provision of veterinary services. Various countries have started to implement, or have already implemented, privatization of some veterinary services. The results are mixed. It is established that private provision alone is not optimal, and a blend of private and public sector veterinary services is required to utilize the virtues of both.The privatization process has also begun in India. Certain state governments in India are pursuing a cost recovery approach and are encouraging private practitioners to cope with the financial constraints and to deliver broad and effective animal health and breeding services. This paper considers the global aspects of the privatization of veterinary services as well as the scenario in India, so as to gain an insight into the very complex and debatable issue of privatization of veterinary services.     

浅谈猪的健康养殖

随着我国养猪业的快速发展,猪病的发生率不断上升,对环境的污染不断严重,猪肉产品的质量也在不同程度上存在一些问题,影响了养猪业的可持续发展和人的健康。为实现养猪业安全、优质、高效和无公害生产,必须实施猪的健康养殖。本文提出了实现猪健康养殖的对策。