交配的

So one evolutionary consequence to keep an eye out for in Laysan albatross populations that have high rates of female-female pairs is the evolution of males that spend more time copulating with females to whom they are not permanently bonded, says Bailey.

因此，引人关注的莱桑信天翁种群当中出现高比例的雌雌配对现象，是雄鸟进化的结果，因为它们可以有更多的时间同那些关系并不永久的雌鸟交配，。贝利指出。

Each male ratwas paired with 2 female rats in proestrus when administration terminated. Femalerats were examined the next morning for the presence of sperm in vaginal smears andunderwent a cesarean section on day 13 of gestation. Then the reproductive indiceswere calculated as follows: copulation index, pregnancy index, and fertility index,which can evaluate male fertility directly. The sperm motility and morphology wereevaluated by computer-assisted sperm analysis, moreover, the caudaepididymal sperm ultramicrostructure were analyzed by transmission electronmicroscope, which can evaluate the influence on sperm maturation bydutasteride ; sperm survival rate was assessed by SYBR-14 and propidium iodidefluorescent staining; serumal dihydrotestosterone and testosterone of ratswere detected by enzyme-labeled immunoassay, which can evaluate the effecton androgenic levels; the weights of testes and epididymides, were determined byprecise electronic balance; histological examination of above tissues were evaluatedby HE staining and TEM, which can evaluate treatment on histology of reproductiveorgans by dutasteride.

给药结束后雄鼠与处于动情前期的雌鼠按2：1合笼，计算雌鼠的交配指数、受孕指数和生育指数，直接评价雄鼠生育力；采用计算机辅助精子分析系统分析大鼠附睾精子活力和形态，在此基础上合并使用透射电镜技术对各组附睾尾部精子进行透射电镜分析，评价度他雄胺对大鼠精子成熟的影响；采用SYBR-14和propidium iodide双重荧光染色计算精子存活率；采用Elisa法测定大鼠睾酮(testosterone， T)和双氢睾酮(dihydrotestosterone， DHT)血清浓度，评价度他雄胺对雄鼠雄激素水平的影响；采用精密电子天平对各组睾丸、附睾、前列腺和精囊进行称重，评价度他雄胺对大鼠生殖器官重量的影响；采用HE染色法对各组睾丸和附睾进行组织学分析，同时采用透射电镜技术对附睾上皮细胞超微结构进行分析，评价度他雄胺对大鼠主要生殖器官组织学的影响。

Planned mating can have a dramatic effect on the genetic progression of a dairy herd if the correct proven sires are selected.

如果正确的证明陛下被选择，计划了的交配能有在乳酪农场兽群的遗传基因的前进方面的戏剧性的效果。

But the red finch females who thought they were mating with an incompatible black-headed male had significantly more baby boys.

而红色头纹的雌胡锦鸟由于认为是和一只不相容的黑色头纹的雄胡锦鸟交配，则生下雄宝宝的数目要比雌宝宝的数目多得多。

On the other hand, in a relatively stable population, if all females mated with the flashiest guy, the charm of finches would become inbred.

另一方面，在一个数量相对稳定的群体中，如果所有的母鸟都和最华丽的公鸟交配，那么鸟儿的魅力都是与生俱来的。

Instead they were concerned about the putative effects of rural "degeneration" on the Nation and its food supply, as seen most glaringly in notorious stories about inbred, mentally defective families such as the Jukes and the Kallikaks.9 In order to counteract what they thought was the growing insularity, narrowness, and anarchy of rural life, they spent much of

与上述研究不同，他们关注的是假设的国家乡村&退化&的结果和食物供应问题，如臭名昭著的Jukes和Kallikaks这样的近亲交配、心理缺陷的家庭，这是个典型案例。

Once peahens start finding fan-shaped green tails with spots sexy, then it is in their interests to mate with the male with the best tail of that description.

一旦雌孔雀开始认为带有斑点的、扇状的绿色尾巴是迷人的，那么它们就乐于和符合这种描述而且拥有最美丽的尾巴的雄性交配。

Most genetic studies suggest that the Japanese eel is composed of a single panmictic population throughout East Asia . Therefore, international management is needed among the countries of China , Taiwan , Korea , and Japan , where glass eels recruit from a common stock and are used extensively for aquaculture.

很多遗传学研究认为日本鳗鲡由东亚地区的一些单一的群体随即交配来进行生殖的，因此，在东亚的中国，中华台北，韩国和日本这些国家和地区这些地方鳗苗来自同一个补充群体，而且还被广泛的用于养殖，因此更加需要统一的国际惯例条例来进行管理。

Neutering, of course, removes the ability of the male to produce sperm making successful mating impossible.

绝育的，当然，删除的能力的男性产生精子，使成功的交配是不可能的。

Imagine further that, as they pass each other above the polar ice-cap, the pilots of their respective Boeings, in defiance of regulations and technical feasibility, begin to execute a series of playful aerobatics criss-crossing, diving, soaring and looping, like a pair of mating bluebirds, so as thoroughly to entangle the aforesaid umbilical cords, before proceeding soberly on their way in the approved manner.

再想像下去，当他们在冰雪覆盖的极地上空交错而过时，两架波音飞机的驾驶员，不顾飞行规定和技术可行性，玩儿起了一系列的特技--交叉飞舞、俯冲、攀升、转圈，就像一对交配中的蓝色鸣鸟上下翻飞，以至于把前面所说的纽带彻底缠绕在一起，然后才回归正常的飞行方式。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐