母猪繁殖障碍征的病因学研究

某猪场一批初产母猪发生流产、早产、死胎、死仔和木乃伊胎为主要表现的繁殖障碍征。调查发现繁殖障碍占调查胎数的 ５１７％ ,其中早产占 １０８％ ,一窝中部分死胎（仔）占 ６９６％ ,全窝死亡占 １９６％ 。在因繁殖障碍损失的胎、仔数中,死胎占６９７％ ,产后即死占 ２４９％ ,木乃伊和畸形占５４％ 。血清学检测结果显示：呼吸和繁殖障碍综合征、流行性乙型脑炎和布鲁氏菌病为阴性而细小病毒为阳性,故诊断为细小病毒感染所致。     

大白菜新品种中熟5号的选育

自交不亲和系 2 3 5 8s是从大陆型的洛阳大包头中选育的 ;优良自交不亲和系H 1 3 1是从海洋型的本地优质笔尾白的自然杂交后代中分离出的。两个亲本经过严格的抗病性鉴定 ,亲和指数测定 ,配合力分析 ,配制成优良的一代杂种中熟 5号。该品种高抗霜霉病、软腐病、黑斑病、菌核病和病毒病 ,比当地主栽品种增产 10 %以上 ,现已在福建省及其它南方地区大面积推广。     

2000－2010年中国退牧还草工程区生态系统宏观结构和质量及其动态变化

本研究以生态学理论为基础,以空间信息技术为支撑,基于遥感数据、气象数据和地面观测数据,通过多源数据融合、生态模型模拟和尺度转换手段,分析中国退牧还草综合治理工程区2000－2010年生态系统宏观结构和质量的时空分布及变化趋势,探讨生态系统变化的自然和人文驱动机制,为退牧还草工程的生态成效评估提供理论依据。研究结果表明,1）2000－2010年,草地生态系统面积保持平稳,生态系统宏观结构稳定,但局部区域仍存在草地与农田、湿地和荒漠间的相互转化;2）研究区草地退化趋势已得到初步遏制,植被覆盖度略有增长,叶面积指数略呈波动式增加,净初级生产力呈显著上升,草地植被呈现恢复转好态势,生态系统总体质量有所提高,生态环境向良性演变;3）研究区生态状况具有空间差异性,总体转好,局部变差,各亚区整体水平排序为内蒙古东部退化草原治理区＞青藏高原江河源退化草原治理区＞新疆退化草原治理区＞蒙甘宁西部退化草原治理区;4）退牧还草工程的实施有利于草地保护,气候暖湿化促进植被生长与恢复,人类活动干扰局部地区生态系统,三者共同影响研究区总体生态状况。     

宿根花卉的繁育及在西北地区园林中的应用

介绍了宿根花卉的繁育技术;根据宿根花卉的生态和形态特性合理配置,概述了其在各种类型园林景观中的应用。     

A pre-synchronization program at early postpartum might increase the chances of Bos indicus cows cycling prior to 50 days regardless of the length of calf separation

The aim of this study was to establish if pre-synchronization would enhance the number of animals cycling prior to conventional breeding at 45 days irrespective of the length of calf separation. Multiparous Bos indicus cows were allotted in four groups (n = 10). Control group (C) dams remained with their calves; groups G24, G48 and G72, which were partially weaned for 24, 48 and 72 h, respectively, were estrus synchronized using a controlled internal drug. These procedures were performed at 25 days and again at 45 days postpartum. The number of follicles, presence of a corpus luteum and back fat thickness (BFT) were determined by ultrasound. The proportion of cows with estrus and ovulation at day 25 postpartum was statistically different between the control and treated groups, with the values being 20, 60, 50 and 70 for the control, G24, G48 and G72 groups respectively (P < 0.05). At days 45 postpartum, the proportion of cows with estrus and ovulation was different in group G48 compared with the other groups (P <0.05). The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05). Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a regular body condition were significantly different regardless of whether the dams remained with their calves or were separated, regardless of the length of this event. It can be concluded that (1) a pre-synchronization program at day 25 could trigger the onset of ovarian activity and facilitate a breeding program at day 50 and (2) temporary weaning enhances the effect of a pre-synchronization program.     

水稻粳糯杂交新组合的选育及其特征特性

选用综合农艺性状优良的粳型寒丰糯（HFWx）,与同型的寒丰不育系（HFA）进行杂交、回交转育成粳型糯质新不育系寒丰糯A（HFwxA）,与自主选育的粳型糯质恢复系糯恢2号配组育成了杂交粳型糯稻新组合糯杂2号。小区试验和生产示范结果表明,该组合具有高产、优质、抗性强等特点。介绍了糯杂2号的选育经过、产量表现和特征特性。     

金州黑色标准水貂对中国养貂行业的影响

介绍了金州黑色标准水貂这一品种的培育过程和优良特性 ,阐述了该水貂新品种对推动中国水貂养殖行业的发展将起到很大的作用     

New Varieties of Populus tomentosa Carr. and Breeding Techniques

The main morphological characteristics, producing area and growth characteristics of sixteen new varieties of Chinese white poplar (Populus to-mentoso Carr. ) are reported, aiming at providing referernce for breeding and extension of new varieties.     

优质晚粳糯稻不育系绍糯9714A的特性与应用探讨

绍糯9714A系绍兴市农科院以滇Ⅰ型不育系7627A作母本,以绍糯9714为轮回父本,经多代回交转育而成,2005年9月通过浙江省科技厅组织的技术鉴定。绍糯9714A属半矮生类型品种,群体不育株率100%,败育花粉率99.95%,以染败为主,米质指标达部颁优质食用稻米二级标准以上。以绍糯9714A所配的粳糯杂交组合米质优、抗病性好,试种示范表现优良,增产显著。