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本研究以白萨福克羊为父本,藏系绵羊为母本,通过白藏杂交提高产肉性能。在自然放牧条件下,经测定,12月龄白-藏羊活重比藏系绵羊高6.82%,差异显著(P0.05),胸围极显著大于藏羊(P0.01);胴体重提高12.36%,净肉重13.28%,净肉率提高6.02%,屠宰率提高7.50%,差异显著(P0.05);眼肌面积提高1.65%,差异不显著(P0.05);GR值差异极显著(P0.01);后腿肉重提高18.02%,胸下肉降低21.13%,颈肉重提高95.24%,差异均极显著(P0.01);腰肉提高4.08%,肋肉提高6.90%,肩胛肉重提高6.30%,差异显著(P0.05)。大腿肌肉厚提高58.54%,腰脂厚降低23.08%,差异均极显著(P0.01);背脂厚度、胴体长、胴体深、胴体胸深、胴体后腿长、胴体后腿宽、腰部肌肉厚均差异不显著(P0.05)。白-藏羊与藏系绵羊相比,剪切力、失水率、熟肉率差异均显著(P0.05)。 相似文献
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阿勒泰羊是新疆阿勒泰地区的古老羊系,哈萨克绵羊品种的优良分支,在绵羊分类上尾肥臀羊品种,是新疆肉脂兼用的地方良种,是我区绵羊品种资源中珍贵的畜种。近十多年来,由于无计划地引种,阿勒泰羊本品种选育和保种工作跟不上,对该品种繁殖保存是极大的威胁。因此,对阿勒泰羊品种资源 相似文献
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为了在非繁殖季节判断绵羊的发情状况,试验以新疆高海拔地区中国美利奴羊为研究对象,采用酶联免疫测定(ELISA)法测定绵羊血清中雌二醇(E2)、孕酮(P4)、促卵泡素(FSH)、促黄体生成素(LH)的含量,研究激素诱导发情羊、发情症状不明显羊、不发情羊体内激素分泌规律的差异。结果表明:激素诱导发情羊的E2含量比不发情羊高,差异显著(P<0.05);但是在P4、FSH、LH水平上,激素诱导发情羊要低于不发情羊,差异不显著(P>0.05)。发情羊与发情不明显羊在4种激素含量上差异不显著(P>0.05),说明公羊试情存在一定缺陷,而通过测定E2含量判定绵羊发情状态将成为未来研究的重点。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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