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《水禽世界》2015,(7)
为了更好地对京海黄鸡配套系繁殖性能进行选择育种,对京海黄鸡杂交配套系(B♂×(F♂×J♀)简称:FBJ)繁殖性状进行了相关分析。数据来自连续四个世代配套系孵化成绩数据记录,对产蛋周、种蛋合格率、毛蛋率、种蛋受精率、入孵蛋孵化率、受精蛋孵化率和健雏率等孵化性能进行了相关分析,同时对后4个指标进行了相关分析并建立了种蛋受精率对孵化率、健雏率等的回归方程6个,结果表明:杂交配套系FBJ入孵蛋孵化率、受精蛋孵化率与受精率之间的相关系数分别为0.997、0.918,且相关极显著;入孵蛋孵化率与受精蛋孵化率之间相关系数为0.938,相关极显著;产蛋周与种蛋合格率、受精蛋孵化率之间为负相关,相关系数分别为-0.369、-0.398,且相关显著,研究结果为京海黄鸡繁殖性能测定和育种提供了参考依据。 相似文献
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供温不均会降低鹅蛋孵化率徐强（河北省乐亭县畜牧局０６３６００）某孵化场采取机孵、摊孵结合（前２３天机孵，２３天后上摊孵），孵化雏鹅两批。第一批入孵种蛋８２０枚，受精率８２．５％，上摊照蛋受精蛋存活９５．７％；第二批入孵８１２枚，受精率８５．１％，上摊... 相似文献
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仙湖肉鸭A系种蛋重与蛋形指数对孵化效果的影响 总被引：1，自引：0，他引：1
将仙湖肉鸭A系种蛋按蛋重分为7组、按蛋形指数大小分为6组,在相同条件下孵化,结果表明,蛋重不仅对孵化率、死胚率影响较大,而且对受精率亦有影响。当蛋重在95～99g(D组)时,孵化效果最好,种蛋受精率96.18%,受精蛋孵化率高达83.86%,入孵蛋孵化率达80.66%。当蛋重大于110g时,种蛋受精率下降至89.74%,受精蛋孵化率下降至71.43%,入孵蛋孵化率下降至64.10%;当蛋重小于85g时,受精蛋孵化率、入孵蛋孵化率分别下降至73.02%和71.88%。蛋形指数对孵化率、死胚率影响也较大,当蛋形指数为0.66～0.74时,受精蛋孵化率达80%以上,入孵蛋孵化率达76%以上,死胚率小于15%,孵化效果较好,且与其它各组差异显著。 相似文献
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我校科研禽场孵化房孵化樱桃谷鸭种蛋已多年,在实践中逐步掌握了一些孵化技术,取得了较好的孵化效果。1991年入孵樱桃谷鸭种蛋86批,共计519374枚,其中受精蛋423452枚,种蛋受精率81.53%;孵出雏鸭396169只,受精蛋孵化率98.56%,其中健雏392502只,占99.07%,取得了较好的经济效益。我校孵化房不但孵化率较高,而且各批孵化成绩比较稳定,全年86批种蛋中,受精 相似文献
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从种蛋贮存室里随机称取1000枚乌骨鸡种蛋,根据蛋重不同分为三组,第一组为48．5克以上,第二组为43～48．5克,第三组为43克以下,将这三组蛋进行同批入孵。结果表明第二组种蛋在受精率、早期死胚率、受精蛋孵化率、入孵蛋孵化率、健雏率、死胚率等孵化效果的指标上对其他两组有显著差异。 相似文献
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一、孵化率变化的情况我场1982年饲养星布罗种鸡900只,于同年11月16日开始孵化,每7—10天入孵一批。种蛋每天送蛋库保管,孵化室备有保温、降温设施及小型发电设备,保证机器正常运转。根据实际孵化成绩,1—15批种蛋受精率、受精蛋的孵化率、各检死胎率,统计如: 相似文献
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《中国家禽》2020,(6)
为比较单阶段大箱体孵化器与多阶段巷道式孵化器对海兰褐父母代种蛋孵化性能的影响,将279 804个来源于37～45周龄海兰褐父母代的合格种蛋随机分成两组,单阶段组共入孵129024个、多阶段组共入孵150 780个。两组种蛋同一天入孵,出壳后分别统计两组各周龄的孵化率及1日龄健母雏的体重和体长等。结果显示:随着周龄的增加,单阶段组受精蛋孵化率和受精蛋健母雏率更高。在43和45周龄,单阶段组受精蛋孵化率极显著高于多阶段组(P0.01),受精蛋健母雏率显著高于多阶段组(P0.05);单阶段组1日龄健母雏的体重和体长极显著高于多阶段组(P0.01)。研究表明:不同孵化模式对海兰褐父母代种蛋孵化性能有影响;使用单阶段大箱体孵化来自43周龄后海兰褐父母代的种蛋,可同时获得更高的受精蛋孵化率和健母雏率及更优的生产性能。 相似文献
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《水禽世界》1984,(2)
孵化 (一)种蛋合格率;数占产蛋总数的百分比。指种母禽在规定的产蛋期内所产符合本品种、品系要求的种蛋种蛋合格率(%)=合格种蛋数产蛋总数X 100(二)受精率:受精蛋占入孵蛋的百分比。血圈、血线蛋按受精蛋计算;散黄蛋按无精蛋计算。受精率(%)=受精蛋数入孵蛋数X 100(三)孵化率(出雏率):1.受精蛋孵化率:出雏数占受精蛋数的百分比。受精蛋孵化率(%)=出雏数受精蛋数X 1002.入孵蛋孵化率:出雏数占.入孵蛋数的百分比。入孵蛋孵化率(%)=出雏数入孵蛋数X 100健雏指适时出壳、绒毛正常,脐比分百的数雏出占。数者禽形雏畸康1无健、指泼 :活率神雏精… 相似文献
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Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
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Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
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在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
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