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1.
以德系、法系安哥拉、沪２０７１ 系和ＧＳＡＢ兔为育种素材，通过合成杂交方式建立选育基础群，实施半开放式核心群世代选育，经过５ 个世代育成粗毛型兔新品系。新品系平均年产毛量１７０４ｇ，兔毛品质优良，粗毛率２０．１１％ ，料毛比４０．３３∶１，成年体重５．５ｋｇ，体长５５ｃｍ ，胸围４０ｃｍ ，平均窝产仔７．３６只，育成成活率９２％ 。适应性和抗病力较强，体质健壮，外貌整齐，遗传性稳定 相似文献
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粗毛型长毛兔选育研究 总被引：2，自引：1，他引：1
以杂交育种的方法，在德系长毛兔中导人粗毛率高的基因，经过三代以上的杂交，所获得杂种粗毛兔１２００只，平均粗毛率１４．０９％，年产毛量７４４克。从中途出粗毛率高、产毛量高的粗毛型兔２５０只进行横交固定，经过四个世代选育后已进入五世代，其生产性能如下：平均产活仔数７．２９±２．４８只，２１天泌乳力达２０８２±５８．５克，４２日龄断奶个体重达１０８０±１４５克，６月龄体重达３４０５±６５克，８月龄体重达４１４５±３４０克，１１月龄体重达４４００±３９２克，粗毛率达１５．５６％±４．９１％，产毛量达８８０±４０克，均达到和超过原定选育指标。粗毛型长毛兔经过八年的培育，其遗传性状已基本趋于稳定。运用半同胞组内内相关系数的方法测定：粗毛率的遗传力为０．１３４，产毛量的遗传力为０．２９５，与德系长毛兔产毛量遗传力０．３相近，初生个体重、２１天窝重、断奶个体重的遗传力分别为０．１１７、０．２３３、０．１６１，粗毛率与产毛量的遗传相关系数为０．１３１，表型相关系数为０．１４７，均呈正相关。 相似文献
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皖Ⅲ系长毛兔系统选育中产毛性能的研究 总被引：1，自引：1，他引：0
皖Ⅲ系长毛兔是在皖系粗毛型长毛兔的基础上，又经５个世代的继代选育而成。据五世代测定：其１１月龄产毛量达２５３．１９克；１１月龄粗毛度１５．１４％，参加繁殖１－２胎的周岁成年母兔的粗毛率达１７．５８％。１１月龄产毛量和粗毛率分别较皖系粗毛兔提高２２．５９％和１０．５９％。１１月龄毛纤维的长度、细度、强度及伸度，其粗毛分别为１１．４９ｃｍ、４５．１２μｍ、２３．４７克和４６．７２％，细毛分别为７．４０ 相似文献
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《中国牧业通讯》2000,(12):30
泰山长毛粗毛型兔高产品系是以德系安哥拉兔、GSAB肉兔、法系安哥拉、沪2071系兔为育种素材，采取合成系育种方法组建育种核心群，实施半开放式核心群育种和经改进的群体继代方法选育，历时6年培育而成。该品系具有明显优于现有兔种的5大特点： 1、体型大、生长快，11月龄体重5130克，成年体重平均5500克，体长55厘米，胸围40厘米，属大型长毛兔。 2、产毛量、产毛率高，平均单次剪毛量423克，年剪毛量1690克，产毛率达34.34％，料毛比达41.58％。 3、粗毛率高、毛品质好，平均粗毛率达20.11％，毛纤维长、韧度好，达到毛纺织业优级粗毛型兔毛标准。 相似文献
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从５０００余只杂种兔中,按公母比例１∶８选择３００余只体重大、产毛量高的个体进行横交固定,经过４个世代的选育,兔只（１１月龄）平均体重达５３８６克,年产毛量１４２４克,粗毛率１１．７４％,结块率２．２４％,胎产活仔７．２６只,料毛比４３∶１。种兔外貌特征一致,遗传性能稳定。现有核心群种兔１２００只,繁殖群７２００只,生产群２．５万余只,向省内外推广繁育２８万只,各项生产指标均达到或超过预定标准及全国家兔育种委员会制定的“德系长毛兔种兔鉴定标准”和“粗毛型长毛兔的选育指标”。 相似文献
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对用中系安哥拉兔导入德系安哥拉兔，唐行系长毛兔和粗毛型长毛兔血液中培育出的鲁西茌平长毛兔的兔毛品质进行了测定。结果表明：成年兔绒毛和粗毛的细度分别为１４．１１μｍ和４２．３１μｍ；成年公、母兔的粗毛率分别为１３．４０％和１３．６０％，毛镥长度分别为５．３８ｃｍ和５．３１ｃｍ（６５ｄ养毛期）。 相似文献
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对皖Ⅲ系长毛兔兔毛进行分析测定，结果：１１月龄产毛量和粗毛率分别为２５３．１９克（折合年产毛量１０１２．７６克）和１５．１４％；１１月龄毛纤维（养毛期９１天）的粗毛长度、细度、强度及伸度分别为１１．４９厘米、４５．１２微米、２３．４７克和４６．７２％，细毛分别为７．４０厘米、１４．８６微米、４．２３克和４４．９７％。 相似文献
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泰山粗毛型长毛兔高产核心群的组建 总被引：1，自引：1，他引：0
根据合成系育种原理,利用德系安哥拉兔产毛量高、被毛密度大的遗传基础,杂交导入ＧＳＡＢ兔粗毛率高、生长快、体重大的优良基因,经杂种一代横交或用德系安哥拉兔回交后,分离筛选得到毛密、体大、粗毛含量高的粗毛型兔,然后进一步同质迁入新法系安哥拉、沪２０７１系等粗毛型兔的高产基因,获得高产毛量、高粗毛率的理想型个体组建选育核心群。核心群基因来源及血统比例为德系安哥拉占３７．５％,ＧＳＡＢ占１２．５％,新法系和沪２０７１系分别占２５％。 相似文献
9.
不同血统含量对粗毛型长毛兔主要生产性能的影响和探讨 总被引：1，自引：1，他引：0
对粗毛型长毛兔育群主要生产性能与导入的新西兰（Ｎ）ＳＡＢ（Ｓ）法系安哥拉兔（Ｆ）德系安哥拉兔血统（Ｇ）含量的多少进行了分析，结果表明：不同生产性能群体之间，不同血统类型含量在存在着明显的差异，Ｓ血统导入提高了粗毛率和成年体重，但对产毛量有负面影响；Ｎ血统的导入可提高粗毛率；Ｆ，Ｇ血统对粗毛率，年产毛量，８月龄体重未产生显著影响。 相似文献
10.
利用通径分析的原理和方法，对皖系粗毛型长毛兔选育群三、四、五世代１１月龄粗毛率进行通径分析。结果发现５、８、１１月龄粗毛率分别为１０．７３±１．３３％、１２．５６±１．７５％、１３．０５±２．０７％，相互呈中等以上正相关；５、８月龄粗毛率与相应的体重、产毛量呈弱负相关（Ｐ＜０．０５）；１１月龄粗毛率与相应的体重、产毛量相关不显著（Ｐ＞０．０５）；直接影响１１月龄毛率最大的性状是８月龄粗毛率，其相关和通径系数较高（ｒ（ｙｘ６）＝０．７０３４，Ｐ（ｙｘ６）＝０．），其次为５月龄产毛量和粗毛率，其他性状影响较小。因此，选育粗毛型长毛兔应以８月龄粗毛率为主要选种依据。 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. 相似文献
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M. Masko M. Domino K. Skierbiszewska Ł. Zdrojkowski T. Jasinski Z. Gajewski 《Equine Veterinary Education》2020,32(12):654-663
Complications in late gestation are challenging problems for the equine clinician and are causes of considerable distress to owners. Health problems in a pregnant mare in each stage of gestation can adversely affect the pregnancy. It is important to obtain a thorough history and perform a detailed and systematic examination of the pregnant mare so that the mare may be classified as normal or high-risk. However, even after a thorough examination, practitioners may face problems with the interpretation and assessment of risk. Normal mares should foal in the stable or pasture. Mares classified as having a high-risk pregnancy need to be monitored precisely for signs of oncoming foaling with attendance of trained personnel when labour begins. A valuable method for monitoring of the high-risk mare is assessing fetoplacental well-being. Fetoplacental well-being is most accurately assessed with ultrasonography as well as several available hormone profiles. We are proposing our scoring system of the mare's health, which may be useful in the assessment of risk during pregnancy and help clinicians to decide whether sending the mare to the clinic is reasonable or unnecessary. 相似文献
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为了找出支配鸡胆囊交感节后神经元的分布规律,选用体重1.5 kg～2.5 kg的成年母鸡6只,将CT-HRP溶液注入胆囊壁,动物存活3 d～4 d后,经左心室灌流固定,取内脏神经节、肾上腺神经节以及双侧胸、腰和荐段交感干神经节,制成50 μm的连续冰冻切片,TMB法呈色反应,置明视野显微镜下观片统计.结果发现,支配鸡胆囊的交感传出神经元胞体位于内脏神经节(占41.1%)、肾上腺神经节(占40.5%)和T2～T7交感干神经节(占18.4%),在交感干神经节中标记细胞的峰值位于T5、T6交感干神经节.所有的标记细胞以位于右侧的占优势. 相似文献
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Webbon P 《Equine veterinary journal》2012,44(1):8-12
The understanding and application of genetics have grown extremely quickly since it has become possible to sequence the whole genome of an organism. The human genome sequence was completed in 2001 and that of the horse in 2007. The significance of this is that it makes it more feasible to explain how both genetically simple and complex traits are transmitted from one generation to the next and, therefore, to make informed breeding decisions, modify how horses are managed and trained to minimise the risk of disease and injury, and improve methods of prevention, diagnosis and treatment of many conditions. The science of genetics/genomics will continue to grow internationally, limited only by the funds available. The application of the science to man, horses and other species raises very complex moral and commercial issues. Thoroughbred breeders are perceived by some as resistant to change, but their apparent intransigence is often based on a genuine concern for the integrity of the breed. By taking control of the application of the advances in genetics, the Thoroughbred industry potentially has the opportunity to improve both the health and performance of Thoroughbreds. If, however, the science is applied in an uncoordinated manner, driven by commercial interests with no underlying concern for the horses themselves, there is a very real risk that breeders, the Thoroughbred breed and individual horses will all suffer as a consequence. 相似文献
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犊牛腹泻与肠道菌群的变化 总被引：1，自引：0，他引：1
本文检测腹泻犊牛的直肠内8种主要正常菌群的变化,并与健康犊牛进行对比。结果发现,犊牛腹泻时,大肠杆菌、双岐杆菌和乳杆菌变化较大,而其它菌群变化较小。腹泻或将腹泻时,大肠杆菌数增加,双岐杆菌和乳杆菌数下降。腹泻康复或即将康复时,大肠杆菌减少,双岐杆菌、乳杆菌数增加。 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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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献