维生素E对果蝇生育力和寿命的影响

为了探讨不同浓度维生素E对果蝇生育力及果蝇寿命的影响,试验在果蝇培养基中加入了不同浓度维生素E,观察其对果蝇生育力、羽化延续时间及寿命的影响.结果表明:随着培养基中维生素E浓度的升高,果蝇生育力在F1、F2、F3代均升高(P<0.05或P<0.01),而果蝇的羽化延续时间没有明显变化(P>0.05);培养基中添加维生素...     

不同性比例对丝羽乌骨鸡生育力效果研究

本试验研究证明,丝羽乌骨种鸡公母性比为1:20及1:22时,所产种蛋的受精率与出雏率跟目前公认的l:10￣1:12的性比例比较无明显差异。因此认为,l:20￣1:22的性比例即可保证较高的生育力,又可降低养鸡成本,最为适宜。     

公畜不育的临床检查方法

导致公畜不育和生育力低下的疾病一般很容易检查出来,但是有些不见明显外部症状或呈慢性经过的生殖系统疾病在临床上,特别是在发病初期往往被忽略,以致于对生育力造成影响。1询问病史并查阅配种记录除了解品种、年龄、饲养管理状况之外,应特别注意了解病史。例如,包皮和阴茎的损伤可能引起粘     

西红柿汤有助提高男性生育力

英国科学家日前公布的一项研究显示，每天喝西红柿汤能增加人体对番茄红素的吸收，从而有助于提高男性生育力。研究人员发现，这些男子精液中番茄红素含量分别增长7％～12％不等。目前已知不育男性精液中番茄红素含量较低。因此，研究人员认为，男性生育力增强与番茄红素含量增高有关。     

咖啡因对果蝇生物学效应的研究

为了探讨咖啡因对果蝇寿命、生育力和体重的影响,试验采用向培养基中添加咖啡因饲喂果蝇的方法对其进行研究。结果表明:在培养基中添加咖啡因能显著缩短果蝇平均寿命,与对照组相比,0.5,1.0,3.0 g/L浓度组雌果蝇平均寿命分别缩短了18.20%、51.35%、73.57%,雄果蝇平均寿命分别缩短了16.30%、58.96%、75.54%,差异均极显著(P<0.01);饲喂咖啡因后F1和F2代果蝇数量与对照组相比,分别下降了33.03%、71.04%、88.69%和49.05%、70.95%、90.71%,差异均极显著(P<0.01);试验组果蝇的平均体重均呈先上升后下降的趋势,但在饲喂咖啡因后,各试验组果蝇的平均体重比对照组下降快。     

新审定通过的茶叶品种

一、苏茶120鉴定编号:苏鉴茶201001。来源与类型:由江苏省无锡市茶叶品种研究所从实生福鼎系统选育,2008年育成。属无性系、小乔木型、中叶类、特早生茶叶品种,适宜苏南地区种植。(1)产量水平及特征特性。鲜叶产量较高,每亩达209.5千克,较福鼎大白茶增产3.6%。芽叶生育力和持嫩性强,一芽二叶期4月6～7日,较福鼎大白茶     

母猪的科学饲养管理

1要选好种母猪种母猪 应当从青年公母猪交配所产的2-4胎春季断奶仔猪中进行选留（后备母猪）,选留这个时期的仔母猪生长快,生育力强。在后备母猪6～8月龄时选繁殖用的种母猪,应当选留生长快、饲料报酬高、四肢开阔、乳头发育均匀良好的母猪。     

Temperature Difference Between the Air and Organs of Rice Plant and Its Relation to Spikelet Fertility

Based on the experiment of measuring panicles and leaves, air temperature, and humidity above the canopy of rice cultivars after heading in 2005 and 2006, we investigated the temperature difference （TD） between the air and organs of rice plant and its relationship with spikelet fertility. The results showed that TDs between the air and organs of rice varied with air temperature, air humidity, and plant type. For similar air humidity, TDs were lower at the air temperature of 28.5℃ than at higher temperature of 35.5℃, whereas for the same air temperature, the TDs decreased as the air humidity increased. TDs were also affected by plant type of the cultivars. Erect panicle cultivars showed higher TDs than those with droopy panicles under similar climatic conditions, and cultivars with panicles above flag leaf （PAFL） had higher TDs than those with panicles below the flag leaf （PBFL）. Cultivars grown in a location with lower air humidity and higher temperature, such as Taoyuan, China, had higher spikelet fertility than those in higher humidity under the similar air temperature during the grain filling stage. This is partially attributed to the larger TDs under the lower humidity. Rowspacing and the ratio of basal-tillering to panicle-spikelet fertilizer showed a significant influence on TD and subsequently on spikelet fertility, suggesting the possibility of increasing spikelet fertility by agronomic management.     

营养物质对绵羊繁殖的影响

营养物质对绵羊正常的生理机能是必需的,一切的营养物质对羊的繁殖总有着直接或间接的影响。在养羊生产上,常见的营养缺乏,如饲料能量的缺乏、蛋白质缺乏、维生素缺乏和矿物质缺乏等症均可引起繁殖障碍。另外,营养过剩也会使绵羊的生育力下降,以致绵羊出现营养性不育。1能量在养羊生产上,碳水化合物是动物日粮