共查询到20条相似文献，搜索用时 187 毫秒
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1980年育成的甘肃高细毛羊是甘肃细毛羊产业当家品种,甘肃省皇城绵羊育种试验场（以下简称皇城羊场）是甘肃高山细毛羊的核心育种基地。甘肃高山细毛羊的育成,标志着甘肃省继新疆、内蒙、吉林之后的又一细毛羊育种成果,填补了我国高海拔地区细毛羊育种的空白。 相似文献
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甘肃高山细毛羊遗传参数估计 总被引：5，自引：0，他引：5
甘肃高山细毛羊遗传参数估计李文辉苏文娟保国俊（甘肃省皇城绵羊育种试验场７３４０３１甘肃高山细毛羊是在１９８０年育成的一个适应高寒牧区生态环境的毛肉兼用细毛羊品种。品种育成后又经１６年的选育提高，质量又明显上了一个新的台阶。随着该品种质量的提高育种工作... 相似文献
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<正> 在法国不仅国家科研单位,而且在一部分种子繁育场里(20个单位),按照长期或短期计划从事苜蓿育种工作。目前情况是品种育成后即停止育种工作,而育成的品种进一步完善,只在种子繁育体系中进行。在国家研究单位中包括国立农业科学研究院及所属的两个选种站,即“路增阳”和“蒙彼利埃”育种站。第一个育 相似文献
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2005年我国猪育种实践中若干问题的讨论 总被引：3，自引：0，他引：3
1 关于育种
过去很多人都抱怨．中国有很多育种专家．却没有育成很好的猪品种．从国外引进大量的种猪。实际上．中国有很多猪品种．有地方品种．也有很多育成品种。近20年中国普遍引入国外长白、大白、杜洛克种猪。引来以后怎么办？基本上是扩繁、销售、退化、再引种。因此．很多人认为引来品种出现很大分离．退化很快．那麽．对国外引入品种如何选育提高．使其适合于本地生产．这个工作是不是育种。2005年以来专家们特别明确了这一概念．“育种就是从遗传上改良．并使其经济效益实现最大化”．这样我们现在的所从事的工作就是育种．不一定追求一个新的品种的育成。大量经验表明．从国外引入品种．能够正常发情配种的母猪大约在70％．到第二代纯繁会出现严重分离现象,这就需要严格选择淘汰。 相似文献
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家禽开放核心群育种体系 总被引：2，自引：1，他引：1
现代家禽育种已不象过去培育标准化品种那样采用所谓标准育种法,而是在过去育成的标准品种或优良品种基础上选育或合成适应现代家禽生产的高产品系,通过品系杂交产生商品禽. 相似文献
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试验选择陕北白绒山羊繁育中心羊场的成年健康母羊（怀孕前期）16只,育成母羊13只,育成公羊13只,空腹称重。测定每只羊1d的采食量,计算其摄入的营养成分含量,并与原苏联绒用山羊饲养标准比较,进行饲养水平评价。结果显示,与饲养标准比较,陕北白绒山羊繁育中心羊场的育成母羊代谢能高2．68MJ,粗蛋白低59．29g,钙低3．00g,磷低1．52g;育成公羊代谢能高3．47MJ,粗蛋白低81．92g,钙低4．42g,磷低2．62g;成年母羊代谢能高2．51MJ,粗蛋白低91．33g,钙低3．09g,磷低1．93g。结合羊的体况综合评价饲养水平基本合理,但尚需要按饲养标准增加粗蛋白、钙、磷等营养物质的供给量。 相似文献
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我国是荔枝、龙眼的源产国,野生荔枝、龙眼资源丰富,有悠久的荔枝、龙眼栽培历史。随着社会的发展,原有的荔枝、龙眼品种难以满足市场需求,因此,选育符合市场需求的优良品种是发展荔枝、龙眼产业的重要任务。本文从不同育种方法,包括常规实生育种、杂交育种、分子标记辅助育种和生物技术育种四种育种方法及每种育种方法育出的品种,对荔枝、龙眼育种的进展进行了全面综述,并对今后荔枝、龙眼的育种发展进行了展望。 相似文献
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Donkeys are bred throughout the world and often play an important role in agriculture. They are also bred to produce mules. Traditionally, jacks are considered challenging to breed in domestic conditions, whether for natural breeding or semen collection using either jennies or mares. The donkey's natural sexual behaviour significantly differs from that of other domestic animals. This presents challenges for in‐hand donkey breeding, particularly on mule studs where normally only jacks and mares are kept for breeding. This article describes some of the authors' observations on sexual behaviour in donkeys and practical experience of some of the strategies employed to apply this knowledge to breeding management, in order to improve the success of using donkeys for both natural service and semen collection. 相似文献
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西门塔尔牛（Simmental）原产于瑞士西部的阿尔卑斯山区,主要产地为西门塔尔平原和萨能平原,是乳、肉、役兼用的大型品种。目前世界上许多国家也都引进西门塔尔牛在本国选育和培育,育成了本国的西门塔尔牛,并冠以该国国名而命名。本文主要介绍近几年西门塔尔牛育种、育肥和屠宰性能的最新研究进展的综述,以期为利用西门塔尔牛品种的养殖场和相关科研提供参考。 相似文献
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采用不同犊牛培育方法,考察对传统饲养条件、高效繁育技术条件下对后代公犊牛及育成种公牛生长发育的影响。研究结果表明:与传统对照组相比,犊牛培育组犊牛成活率、初选合格率、复选合格率和定选合格率分别为100.00%、95.00%、87.50%和80.00%,比传统对照组分别提高17.65%、26.67%、40%和60%,差异显著(P<0.05);与培育对照组相比,犊牛培育组的犊牛成活率、初选合格率、复选合格率和定选合格率分别提高5.27%、11.77%、12.91%和18.52%,差异显著(P<0.05)。采用犊牛培育技术,后代犊牛及育成牛生长发育各项指标较对照组明显增加,有效提高牦牛种公牛培育合格率,从而为大量生产优质牦牛种公牛提供一条切实有效的生产方式。 相似文献
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云南热带雨林地区野猪生物学特性与驯养方法 总被引：1，自引：0，他引：1
为了解云南热带雨林地区野猪的生物学特性与驯化技术,探讨野猪的规模化养殖与开发利用。通过野外实地调查和收集2~4个月体重约5~8 kg的16头野猪,按试验要求与同等体重家猪人工混养驯化2年时间,将试验中观察的野猪部分生物学特性和驯化方法进行总结,整理成可供推广应用的野猪驯化管理模式。结果表明:西双版纳热带雨林地区野猪适应性强,喜集群活动,驯化后性情和食性会发生改变,可全年发情,提高繁殖性能和生长速度。在增加防护措施和户外运动场所的基础上,可参照家猪饲养方法,对纯种野猪进行家养或将纯种公野猪与母家猪进行杂交利用,开发生产无公害优质野杂猪。 相似文献
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The reproductive performance (fertility and prolificacy) of Finnish Landrace (Finn) and Suffolk sheep on an accelerated breeding program was evaluated. Both breeds were contained in each of two separate flocks housed indoors year-round on expanded metal floors in windowless buildings. The two flocks were bred alternately at 4-mo intervals in January, May and September. The sheep were exposed to either an abrupt (ALR) or constant (CLR) lighting regimen. Data from nine breedings during a 4-yr period were considered. Fertility was significantly higher for ewes in the ALR lighting regimen. Fertility was lower for ewes bred in September. For ewes that had lambed from breeding 8 mo earlier, fertility was higher for Finn ewes than for Suffolk ewes; however, similar fertility levels were observed in both breeds if the ewes had not lambed following the previous breeding. Higher prolificacy was observed in the Finn ewes than in the Suffolk ewes, but the differences in prolificacy varied with the month of breeding. The probability of a ewe having more than one lamb was significantly higher for Finn ewes than for Suffolk ewes in both January and May breedings, but was similar in September breedings. Incorporating the Finnish Landrace breed into an accelerated breeding program for sheep maintained indoors year-round is a practical way to increase the number of lambs born. Controlling daylength and dividing the flock into smaller flocks are also practical procedures to increase lamb production. 相似文献
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Tobias KM 《Journal of the American Animal Hospital Association》2003,39(4):385-389
A hereditary basis for congenital portosystemic shunts (PSS) in Yorkshire terriers was explored through record and pedigree analysis and a breeding trial. The odds ratio for PSS in Yorkshire terriers was 35.9 times greater than for all other breeds combined. Wright's coefficient of inbreeding was approximately twice as high for Yorkshire terriers with PSS as compared to normal members of the breed (P=0.09). No common ancestors were found that were significant to the PSS group. Two affected Yorkshire terriers were bred and produced two normal puppies. Congenital PSS appears to be hereditary in Yorkshire terriers; however, the mechanism of inheritance has yet to be elucidated. 相似文献