工厂化水产养殖水质预测预警系统的设计

在对养殖水质需求分析的基础上,设计了一种水质在线实时预测预警系统。该系统具有以下功能:水质实时信息和预测信息的查询、水质预警、水质预警设置和用户管理。在多媒体可视化界面的引导下,信息操作人员可以根据养殖场的实际情况,进行各种预警指标的设定和预警方式的设置。该系统较好地解决了工厂化养殖过程中水质监测预警问题,方便了用户对养殖用水水质的监控和管理。     

Leucoencephalomyelopathy in Australian Rottweiler dogs

Clinical and pathological studies of a neurological disorder of 3 adult Rottweiler dogs are described. Dogs developed proprioceptive losses involving the limbs, leading to progressively worsening ataxia and hypermetria. Blood and CSF fluid analyses were normal and radiographs and myelograms showed no compressive lesions of the spinal cord. At necropsy, severe demyelination of the dorsal and lateral funiculi of the cervical spinal cord was visible grossly. Microscopically there was more extensive, symmetrical involvement of the spinal cord and brain than was apparent grossly, with demyelination of white matter tracts and sparing of axons in affected areas. These changes were considered diagnostic for leucoencephalomyelopathy. This condition has not been previously reported in Australia, and is probably transmitted genetically, presumably as an autosomal recessive trait.     

内蒙古镶黄旗草原生态环境退化原因及可持续发展

以内蒙古自治区草原生态环境严重恶化、经济落后的镶黄旗为研究对象，通过对制约镶黄旗草原生态系统可持续发展的因素进行分析，并结合镶黄旗实际情况，提出适合该区域草原生态环境及经济可持续发展的思路和对策。     

奶牛隐性乳房炎的研究进展

奶牛乳房炎是奶牛常见、多发的疾病之一,严重制约着奶牛养殖业的发展,文章对奶牛乳房炎的病因、发病机理、临床症状、诊断方法及防治措施等进行了综述,这将对内蒙古自治区奶牛养殖业的发展产生积极影响.     

华北土石山区森林枯落物与土壤水文效应研究

以河北省易县崇陵小流域3种不同林分的枯落物层和土壤层为研究对象,对其水文效应进行初步研究。结果表明:3种林分枯落物蓄积量差异较大,侧柏枯落物蓄积量最大,高达57.9t/hm2,油松枯落物蓄积量次之,为29.8t/hm2,刺槐枯落物蓄积量最小,是28.7t/hm2;3种林分枯落物中,侧柏林的枯落物持水能力最强,为114.5t/hm2,油松林的枯落物持最小,仅为60.1t/hm2;3种林分下土壤的平均容重和总孔隙度差别不大,容重的变化范围在1.46~1.66g/cm3;总孔隙度均偏低,具体表现为:侧柏(30.86%)油松(29.31%)刺槐(27.1%);3种林分林下土壤持水能力有所差异,表现为:侧柏油松刺槐。土壤持水能力与各林分林下土壤的孔隙度大小呈正相关,即土壤孔隙度越大,土壤的持水能力越强;3种林分的土壤稳渗速率相差较大,表现为:刺槐(10.50mm/min)油松(2.80mm/min)侧柏(0.80mm/min)。     

西南矮马矮小性状基因SHOX的克隆测序和多态性研究

本研究首次克隆出西南马矮小性状基因完整第二外显子序列,GenBank登录号为EU556739;通过PCR-SSCP方法对8个品种150匹马的该序列做了多态性分析,在P2位点上268处有1个G→A的突变,和431处有1个T→G的突变导致了等位基因B变为等位基因A.该位点除云南文山马(WS)的优势基因型和优势等位基因分别为AB型和B外,其余类群马均为BB型和B.云南丘北马(QB)、云南文山马(WS)、云南大理马(DL)、建昌马(JC)和设特兰马(ST)在P2位点上处于Hardy-Weinberg平衡状态.     

日粮中添加不同锰、锌源对肉鸡生长性能及免疫机能的影响

将216只1日龄健康艾维茵肉鸡随机分为4个处理组,试验期7周。处理组日粮分别在锰含量为37.66mg/kg、锌含量为21.87mg/kg的基础日粮中添加不同的锰源与不同的锌源,其中处理1组为无机锰 无机锌,处理2组为有机锰 无机锌,处理3组为无机锰 有机锰 无机锌,处理4组为无机锰 有机锰 无机锌 有机锌,研究不同锰、锌源对肉鸡生长性能及免疫机能的影响。结果表明,氨基酸螯合锰部分或全部替代日粮中的无机锰,肉鸡生长速度及饲料转化效率有增加的趋势,氨基酸螯合锰、锌同时替代无机锰、锌,肉鸡的生长速度显著增加(p<0.05),饲料转化率也有增加的趋势。氨基酸螯合锰、锌与无机锰、锌相比,有促进机体免疫机能的趋势。     

Soil Physicochemical Changes Following Buffelgrass Establishment in Mexico

Clearing brush from rangeland and seeding it to buffelgrass (Cenchrus ciliaris L.) is a popular range improvement practice in Mexico, but no data are available on the effects of these practices on soil properties. Twenty-nine study sites were randomly selected across 3 major climatic regions in Mexico: 13 in the northwest, 11 in the northeast, and 5 in the southeast. Soils under buffelgrass stands more than 10 years old and on adjacent virgin rangelands were sampled at 0-10, 10-20, and 20-30 cm depths to quantify sand, silt, clay, organic C, total N, pH, EC, CEC, available P, and exchangeable Ca2+, Mg2+, Na+, and K+.Because soil variables were not significantly (P 0.05) different among depths, only data from the surface horizon received further analysis. Soils in the northwest had higher (P 0.05) sand content and were particularly low in total N (0.08%), Ca2+, and K+, while soils of wetter and warmer southeast Mexico were significantly (P 0.05) higher than the other two regions in measures of soil fertility such as organic C (10 times higher), total N, and CEC (both at least 3 times higher). Long-term buffelgrass establishment had the most effect on soils in the southeast and no significant effect (P0.1) on soils of northeast Mexico. Soil organic C and total N both declined (P 0.025) by about 40% under buffelgrass pastures in the southeast; excgangeable Ca2+ decreased (P=0.027) by 21% in the same region, and Mg2+ declined (P=0.03) by 36% under buffelgrass in the northwest. Soil P did not respond to buffelgrass establishment. The findings of this study suggest that high forage yields following conversion of rangeland to buffelgrass pasture will be less sustainable in subtropical regions with high rainfall (mean of 1070 mm in this study) than in the semiarid zone with inherently poorer soils.     

Ultrasound Guided Transplantation of Enriched and Cryopreserved Spermatogonial Cell Suspension in Goats

Spermatogonial stem cells transplantation provides a unique approach for studying spermatogenesis. Initially developed in mice, this technique has now been extended in farm animals and provides an alternative means to preserve valuable male germ line and to produce transgenic animals. The aim of this study was to enrich type A spermatogonial cells amongst the isolated cells from goat testis, to cryopreserve these enriched populations of cells and their subsequent transplantation in unrelated recipient goats under ultrasound guidance. The cells were isolated enzymatically and enriched by differential plating and separation on discontinuous percoll gradient. Ultrasound guided injection of trypan blue dye into rete testis resulted in 20–30% filling of the seminiferous tubules. Prior to transplantation, the cells were labelled with a fluorescent dye to trace donor cells in recipient seminiferous tubules after transplantation. The fluorescent‐labelled cells were observed up to 12 weeks after transplantation.