Locomotion Score and Its Impacts on Production Performance and Blood Routine Indexes in Chinese Holstein

To investigate the influencing factors of locomotion score (LS) and its impacts on production performance and blood routine index in Holstein,body condition score (BCS),LS and DHI (dairy herd improvement) of 1 486 lactating cows from two dairy farms,and the blood routine indexes of 101 lactating cows from one farm in Beijing were measured.The fixed model was used to analyze the impacts of herd,parity and lactation stage on LS,and the impacts of LS and BCS on daily milk yield,somatic cell score,milk composition and blood routine indexes in dairy cows.The results showed that both parity and lactation stage had significant impacts on LS.The LS increased with the increase of parit,the LS increased by 0.71 from first lactation to fifth and above lactation.The LS of cow in lactation stage Ⅲ(100-199 d) and Ⅵ (after 350 d) were significantly higher than cow in stage Ⅱ (45-99 d)(P<0.05),and both were higher than 2.The LS had no significant impacts on daily milk yield,milk composition and somatic cell score (P>0.05).However,the milk yield of the cow with LS≥4 was the lowest,and a decrease of 2.29 kg was found compared with the cow with LS=1.Among the various blood routine indexes,LS had significant impacts on red blood cell count,hemoglobin content,mean corpuscular hemoglobin concentration and lymphocyte count (P<0.05),and had no significant impacts on white blood cell count (P>0.05).With the increase of LS,the red blood cell count,hemoglobin content,mean corpuscular hemoglobin concentration and lymphocyte count of cows decreased with different extents.There were some problems on the body immunity and hematopoiesis of cows with poor LS.In dairy farm,regular evaluation of LS could be used to find the management problems of feet and legs,which had a great significance to reduce the loss of production performance and early culling caused by hoof disease.     

GIS支持下的区域中低产耕地评价与改良利用对策

借助GIS和数学模型集成技术,评价荔城区中低产耕地及其障碍因素,结果表明全区中、低产耕地面积分别为2293.39公顷和1594.97公顷, 分别占保护区耕地总面积的25.49%和17.72%; 中产耕地主要分布于北高和新度镇,而低产耕地则主要分布于北高镇; 中产耕地主要限制因素为旱限制、缺钙限制、瘠瘦限制、缺钾限制、缺磷限制和酸限制,分别占中产耕地总面积的88.76%、18.26%、15.48%、8.18%、7.91%和6.53%,低产耕地主要限制因素为旱限制、缺钙限制、瘠瘦限制、障碍层限制、渍涝限制、盐碱限制和酸限制,分别占低产耕地总面积的96.98%、58.31%、54.89%、18.90%、18.47%、18.47%和16.28%。在中低产耕地及其障碍因素评价的基础上,提出了区域中低产耕地的改良利用对策。     

对抓好营林生产管理工作的几点认识

从4个方面论述了亚布力林业局营林生产管理工作的有效措施。     

Habitat relationships with fish assemblages in minimally disturbed Great Plains regions

Abstract – Effects of local environmental influences on the structure of fish assemblages were evaluated from 159 sites in two regions of the Great Plains with limited anthropogenic disturbance. These regions offered an opportunity to evaluate the structure and variation of streams and fish assemblages within the Great Plains. We used canonical correspondence analyses to determine the influence of environmental conditions on species abundances, species occurrences and assemblage characteristics. Analysis of regions separately indicated that similar environmental factors structured streams and fish assemblages, despite differences in environmental conditions and species composition between regions. Variance in fish abundance and assemblage characteristics from both regions was best explained by metrics of stream size and associated metrics (width, depth, conductivity and instream cover). Our results provide a framework and reference for conditions and assemblage structure in North American prairie streams.     

春作——两系法杂交水稻早秋制——秋菜栽培模式初探

阐述了“春作——培两优特青早秋制——秋菜”栽培模式的科学依据和优点，并具体提出了几种主要的搭配模式，探讨了每种模式的适应范围、品种搭配、栽培管理技术，强调了培两优特青早秋制要培育双强亲本、灵活调节花期和综合防治稻粒黑粉病等几个技术环节。     

云南肉牛生产体系建设

本文根据云南省肉牛生产现状和特点，对云南省肉牛生产体系建设作了全面论述。     

鱼类休闲食品的研制

本文主要介绍了用新鲜或冻藏草鱼制作鱼肉松和五香鱼干的制作工艺，对制品的风味，工艺条件，包装材料，包装方法作了较详细的研究，根据多次实验的结果，找出了最佳工艺条件，制成了味道醇美，咸中带甜，鲜美可口，营养丰富的鱼肉制品。     

淡水鱼肝脏中维生素A1,A2含量的研究

本试验建立了用高效液相色谱法同时测定淡水鱼肝脏中的ＶＡ１和ＶＡ２的方法。以μ－Ｐｏｒａｓｉｌ３．９ｎｍ×１５０ｍｍ（Ｗａｔｅｒｓ Ｃｏ．）为色谱柱，正己烷：乙醚（８７：１３）为流动相，紫外３５０ｎｍ，荧光Ｅｘ３２５ｎｍ，Ｅｍ４８０ｎｍ双道检测，ＶＡ１和ＶＡ２的保留时间分别为２６．２５ｍｉｎ和２８．００ｍｉｎ。采用不同波长条件下的紫外吸收特性，对ＶＡ２予以定性，以ＶＡ１为内标物对ＶＡ２予以定量。实验     

莴苣叶子沼气发酵潜力的研究

本实验以莴苣叶子为原料,采用批量发酵工艺,进行发酵产沼气实验,实验结果表明,莴苣叶子是一种较好的沼气发酵原料,其沼气发酵潜力为747mL/gTS,809mL/gVS。