Subcutaneous fatty acid composition of steers finished as weanlings or yearlings with and without growth promotants

Background: The current study evaluated the subcutaneous fatty acid(FA) composition of calf- and yearling-fed stee with or without growth promoting implants. Crossbred steers(n = 112; 267 ± 5.0 kg) of the same contemporary group were allocated to one of four production system and implant strategy based treatments in a completely randomized design with a 2 × 2 factorial arrangement of treatments.Results: There were no interactions(P 0.05) between production systems and growth promoting implants for the total and individual subcutaneous FA. Yearling as opposed to calf finishing reduced(P 0.05) subcutaneous proportions of C20:3n-6, trans(t)12-18:1, C14:0, several minor cis-monounsaturated FA(c-MUFA; c9-14:1, c11-16:1,c11-18:1, c12-18:1, c13-18:1, c9-20:1 and c11-20:1), and increased(P 0.05) subcutaneous proportions of t11c15-18:2,total and individual branched-chain FA. Subcutaneous fat from steers implanted with growth promotants had higher(P 0.05) proportions of total polyunsaturated FA(PUFA), total n-6 PUFA, C18:2n-6 and individual t-18:1isomers(t6 to t10) compared to non-implanted steers.Conclusions: Overall, current findings show that production systems and growth promotants led to only minor differences in subcutaneous FA composition of beef steers.     

牛环形泰勒虫病二温式PCR诊断方法的建立及初步应用

为建立特异、敏感、快速的二温式PCR诊断方法,根据牛环形泰勒虫裂殖子表面抗原(tams1)基因,设计了一对特异性引物,扩增出大小为154bp基因片段,经克隆、测序分析,与已知基因序列的相似性为96%。用建立的牛环形泰勒虫病二温式PCR诊断方法,对从新疆牛环形泰勒虫病流行地区采集的50份全血样品进行诊断,阳性率为88%,而血涂片检出的阳性率只有58%。经试验验证,该方法具有特异性高、敏感性强、重复性和稳定性好等优点。表明本试验所建立的二温式PCR诊断方法可用于牛环形泰勒虫病的临床诊断、隐性感染检测和流行病学调查。     

畜牧兽医行政执法中证据收集应注意的问题

针对当前畜牧兽医行政执法中出现的突出问题,阐述了执法中证据收集应注意的问题并提出了改进措施。     

森林采伐限额制度存在的问题及建议

森林采伐限额是采伐消耗森林、林木蓄积的最大限量。实行森林采伐限额管理是《森林法》确定的一项重要法律制度,是控制森林资源过量消耗的核心措施和加强森林可持续经营的关键手段。本文阐述了森林采伐限额的概念,分析了当前采伐制度存在的一些问题,提出了改进措施及具体做法,以寻求最佳的森林采伐管理制度,保护好国家珍贵而有限的森林资源,达到科学经营的目的。     

为何国内市场E0级木地板踪影难寻？

很长一段时间内，在国内木地板市场上，主要是强化木地板产品，只要是质量上上点档次、品牌影响较为稳定一些的，几乎都声称自己是“E0”级。一时间“本产品已经达到欧美发达国家E0级产品水平”、“本产品甲醛释放量为0”、“本产品属木地板系列最高等级——E0”等等耀人眼目的字眼跃然各强化木地板产品的柜台上、广告里或包装中。当大家都在喊“本老王的瓜最甜”之时，广大消费者倒是如堕十里云雾之中，搞不明白，为何都声称自己的产品是“E0”级，咋就少见有“E1”、“E2”级产品呢？     

Inclusion body disease in two captive Australian pythons (Morelia spilota variegata and Morelia spilota spilota)

Two captive Australian pythons, one carpet and one diamond python, presented with signs of central nervous system dysfunction. The carpet python was agitated. Its head was tilting and it was incoordinated and had convulsions. It was treated with antibiotics and anthelmintics but was eventually euthanased after failing to respond to therapy. The diamond python had flaccid paralysis of the caudal half. It was not treated and became disoriented and died. Hepatocytes from both pythons contained irregular 2 to 10 m m eosinophilic intracytoplasmic inclusion bodies. The brain of the diamond python was not available for examination. Occasional neurones in the carpet python brain contained similar inclusion bodies and other changes suggestive of viral infection. The clinical signs and histopathological findings in both pythons were consistent with boid inclusion body disease.     

单宁酶的研究进展

详细介绍了单宁酶的来源、生产、提取、纯化及其物理化学和生物学性质,并概述了它的固定化技术。