北京鸭

They spent spring, summer and autumn together, when coming in the winter, mallard people the place that flies to warmth has been to a winter, and Beijing duck still stays on unitive lake, be in to put on the ice by aspic finally on the face.

它们一起度过了春天、夏天和秋天，冬天来临的时候，野鸭们飞到温暖的地方去过冬，而北京鸭则还留在团结湖上，最后被冻在冰面上。

Beijing duck is one kind of food in Beijing.

北京鸭在北京是最受欢迎的食物之一。

The life-cycle of C.baileyi in Beijing duck and in the CAM of chicken embryowas studied with both the light-microscope and the Nomarski interference-contrastmicroscopy.The results indicated that the life-cycle within duck was simillar tothat of CAM.It included excystation, merogony,gamogonyand sporogony.The thin-walled oocyst was first observed and described in China.

借助普通光学显微镜和微分干涉显微镜对C.baileyi在北京鸭体内的生活史和在鸡胚绒毛尿囊膜上的生活史进行了较详细的研究，结果表明：C.baileyi在北京鸭体内和在CAM上的生活史相同，主要包括"脱囊—裂殖生殖—配子生殖—孢子生殖"四个阶段。

Transfecting efficiency of menggu sheep is 52%,Beijing duck is 23%,Qingyuan flesh chicken is 33%,zang chicken is 20%,langshan chicken is 19%.

转染率分别为蒙古羊52%、北京鸭23%、清远麻鸡33%、藏鸡20%、狼山鸡19%。

Hybrid of Jingding duck, Beijing Duck and muscovy is being as a promising broiler strain of white feather, high meat production and quality.

生产性能居国际先进水平。金定鸭、北京鸭和番鸭三元杂交的后代，获得亲代的高产、羽色和肉质优势。

A pair of oligonucleotide primers were designed according to the conserved region of MC1R gene of gallus, coturnix japonica, anser caerulescens, and pavo cristatus.

本研究根据鸡、鹌鹑、雪雁、孔雀等MC1R基因同源序列的保守区设计1对引物，以半番鸭、北京鸭总DNA 为模板，PCR扩增，克隆测序。

In order to clone the VIP gene in the gastrointestinal tract from beijing duck, one pair of specific primers to VIP gene was designed and synthesized according to the chick sequence (X80906). Encoding VIP cDNA fragments were amplified by RT-PCR from the total RNA in the Proventriculus, the Duodenum and the Jejunum of Beijing duck. Their PCR products were ligated into pGEM-T easy vector, which was transformed into E. coil JM109. Positive bacteria clones were screened and identified by PCR method and digested with the double restriction enzyme EcoRⅠ. The sequence of VIP gene fragment was also determined and analyzed.

为从北京鸭胃肠道中扩增血管活性肠肽基因，根据鸡VIP基因（GenBank登录号X80906），设计了一对简并引物，从北京鸭腺胃、十二指肠和空肠提取总RNA，通过反转录－聚合酶链反应扩增，将从腺胃、十二指肠和空肠中扩增出的产物克隆到pGEM-Teasy载体上，导入大肠杆菌JM109，阳性克隆经双酶切鉴定后测序，将测序结果与鸡和鹅（GenBank登录号为DQ023161）的VIP基因进行同源性比较。

The results show that : pig species include Large White, Landrace, Duroc pigs and swine; cattle varieties of Simmental, Shorthorn and Brahman cattle, of Jersey cattle; sheep varieties Boer goats; duck, duck varieties, Cherry Valley Duck, Shaoxing Duck; Chicken varieties are emerging sanhuang, Guangxi top soil chicken, Ma top emerging chicken, black plume bamboo silk chickens and other species.

研究结果表明：（1）猪的品种主要包括大白猪、长白猪、杜洛克猪和香猪；牛的品种有西门塔尔牛、短角牛、婆罗门牛、娟姗牛；羊的品种有波尔山羊；鸭的品种有北京鸭、樱桃谷肉鸭、绍兴麻鸭；鸡的品种有新兴三黄鸡、广西土顶鸡、新兴麻顶鸡、黑羽竹丝鸡等品种。

The results demonstrated that MC1R gene of bird was relatively conserved. The results of phylogenetic analysis showed that consanguinity relations between mule duck, anas platyrhynchos and branta bernicla, anser caerulescens, anser canagica were close.The status of them were confirmed on zoologyl by means of molecular method.

可见禽类的MC1R 基因编码区序列具有高度的保守性；系统进化分析表明，半番鸭、北京鸭与雪雁、黑雁、皇雁亲缘关系相近，从分子角度验证了它们在动物学分类上的地位。

Beijing duck ; Metabolizable energy ; Direct method ; Difference method

北京鸭；代谢能；直接法；差量法

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。