富含硒钴锌的苜蓿青干草在牛羊饲喂中的效果     

李明  哈斯  介晓磊  郭孝  李建平  蒋士传 《家畜生态》2011,(4):34-37

通过在荷斯坦奶牛和杜泊羊日粮中添加5%高硒型、高硒钴型、高硒钴锌苜蓿青干草,研究3种苜蓿青干草对牛羊饲料转化和生产特点的影响。结果表明,功能型苜蓿青干草能够显著提高牛羊的饲料转化率,其中高硒钴和高硒钴锌苜蓿青干草有利于提高羊和牛的日增重,而高硒型青干草有利于提高荷斯坦奶牛的产奶量。  相似文献   

Frequency Hydraulic Aperture about Fracture Seepage in Rock Mass     

XU Guang xiang  HA Qiu-ling  ZHANG Yong xing 《保鲜与加工》2001,(5):50-55

The frequency aperture given in this paper is a new method that describes the fracture aperture composition. The aperture curve plays a role in describing the aperture distribution and uniformity. In particular, the frequency hydraulic aperture is of great importance in seepage analysis. It overcomes limitations of hydraulic aperture and mean aperture. Based on existing information, the result of example calculation shows that the hydraulic aperture e h equals to the median aperture e 50 . This paper also obtains that the frequency hydraulic aperture e sh equals to e 48 through finite element numerical modeling for various type of random fracture.  相似文献   

Connect Technique of Laminated Object Manufacturing Using Metallic Materials as Modeling Materials     

YI Shu ping  HA Jin  LIN Li hong  ZHANG Jin 《保鲜与加工》2002,(2):1

To solve some key problems existed in the manufacturing of metallic functional part via Laminated Object Manufacturing (LOM), a new technique using vacuum solid-state pressure diffusion weld technique to connect the metallic slice sheets is presented in this paper. The following conclusions can be draw from the experiments introduced specially: the size in the stack direction shrink at the rate of less than 1% and the shrinking is owed to regularly error, the atom-diffusion between two combined interface occurred clearly and new crystallites shaped meanwhile, shearing intension of well connected diffusion section is more than 100 MPa and micro hardness of well-knit portion is the same to matrix's. It can be proved from the result above that the vacuum solid-state pressure diffusion technique weld is a perfect technique for connecting metallic slice sheets used in the manufacturing of metallic functional part via LOM.  相似文献   

糖水龙葵果罐头制作工艺研究     

韩天龙  金明晓 《保鲜与加工》2006,6(2):33-34

通过单因素多水平、多因素多水平的正交实验对龙葵果实罐藏工艺进行研究,结果表明,加工条件为烫漂温度60℃,烫漂时间10min,糖水浓度60%,排气温度40℃,排气时间15min.在此条件下罐头产品感官与品质最佳.  相似文献   

动物溶菌酶基因的研究进展   总被引：1，自引：0，他引：1  

孙国庆  哈福  苗永旺  李大林 《中国牛业科学》2012,38(3):51-54,59

溶菌酶[Lysozyme(EC3.2.1.17),LYZ]是机体先天免疫系统中一个重要的效应分子,参与机体多种免疫反应,在溶菌过程中形成一个水解体系,破坏和消除侵入动物体内的病原,从而实现机体的免疫防御。它可以有效抑制葡萄球菌、大肠杆菌等一系列病原菌,是重要的奶牛乳房炎抗性因子之一。本文综述了溶菌酶基因的研究进展,包括其结构与进化、变异及应用前景等。  相似文献   

Arginine Levels Affect Growth and CSN3 Gene Expression of Dairy Cows Mammary Epithelial Cells in Vitro     

XU Bolin  WANG Mengzhi  ZHANG Xingfu  HA Si  WANG Chunyan  AO Changjin  WANG Hongrong 《动物营养学报》2012,24(5)

本试验旨在研究培养基中添加不同浓度的精氨酸( Arg)对乳腺上皮细胞体外增殖及κ-酪蛋白(CSN3)基因表达的影响.选用中国荷斯坦奶牛乳腺上皮细胞进行体外培养,以无Arg的培养基(0.00 mg/L)为对照(0组),试验培养基分别添加69.50(0.25组)、139.00(0.50组)、278.00(1.00组)、556.00(2.00组)、1 112.00(4.00组)和2 224.00 mg/L(8.00组)的精氨酸.结果表明:Arg能促进乳腺上皮细胞的增殖,24 h时,0.25～4.00组与0组相比均差异显著(P＜0.05),8.00组与0组相比差异不显著(P＞0.05);48和72 h时,各试验组与0组相比均差异显著(P＜0.05).Arg能促进CSN3基因的表达,各试验组与0组相比均差异显著(P＜0.05),当Arg浓度为556.00 mg/L时,CSN3基因表达量最高.结果提示,Arg对乳腺上皮细胞增殖及CSN3基因表达均具有明显的促进作用,且在Arg浓度为69.50～1112.00 mg/L时促细胞增殖效果较佳,在Arg浓度为556.00 mg/L时促CSN3基因表达作用最强.  相似文献   

CUE-MATE诱导新疆褐牛同期发情试验   总被引：1，自引：1，他引：0  

李静  王海军  哈克木  扎克尔 《中国牛业科学》2009,35(6)

[目的]为了探索新疆褐牛同期发情处理的有效时间段和最佳处理方法.[方法]采用CUE-MATE孕酮栓+PGF2α法进行新疆褐牛同期发情试验,[结果]表明:同期发情主要集中在取栓后的2 d,平均发情率为72.5%,情期受胎率为66.7%;3月的同期发情率显著高于5月和7月(P＜0.05),达到90.8%,但情期受胎率低于5月和7月,为61.0%,差异不显著(P＞0.05);母牛卵巢上以有黄体的同期发情率最高,达到95.3%,其次是有卵泡的,无黄体、卵泡的最低,三者差异显著(P＜0.05);有卵泡的情期受胎率略高于有黄体的,差异不显著(P＞0.05),无黄体、卵泡的同期发情率和受胎率都最低,差异显著(P＜0.05);育成牛的同期发情率略高于经产牛,为92%,差异不显著(P＞0.05);育成牛的情期受胎率显著高于经产牛(P＜0.05),为73.9%.[结论]环境温度、营养水平及母牛卵巢上有无黄体、卵泡影响发情率的高低,CUE-MATE孕酮栓+PGF2α法可用于诱导新疆褐牛的同期发情.  相似文献   

辐照对冷却猪、鸡肉中细菌ATP发光强度的影响     

居华  哈益明  王锋  刘书亮 《核农学报》2010,24(4):761-765

采用ATP发光法检测辐照对冷却猪、鸡肉ATP发光强度的影响,并对其他试验因素是否对样品ATP发光强度产生影响进行了分析。结果表明:ATP标准品的浓度与发光强度呈显著的正相关,ATP标准品发光强度与辐照剂量表现为显著的负相关;辐照冷却肉的细菌ATP发光强度随辐照剂量的变化趋势呈现为倒"S"形特征,其中6.0kGy辐照时发光强度最大,4.0、8.0kGy剂量辐照时强度最小;无菌水、灭菌样品未对ATP发光强度造成干扰,而未辐照大肠杆菌浓度与ATP发光强度之间呈显著线性正相关,相关系数达到0.9437。  相似文献   

Effects of intensified training and subsequent reduced training on glucose metabolism rate and peripheral insulin sensitivity in Standardbreds     

E de Graaf-Roelfsema  HA Keizer  E van Breda  ID Wijnberg  JH van der Kolk 《American journal of veterinary research》2012,73(9):1386-1393

Objective-To determine the influence of intensified training and subsequent reduced training on glucose metabolism rate and peripheral insulin sensitivity in horses and identify potential markers indicative of early overtraining. Animals-12 Standardbred geldings. Procedures-Horses underwent 4 phases of treadmill-based training. In phase 1, horses were habituated to the treadmill. In phase 2, endurance training was alternated with high-intensity exercise training. In phase 3, horses were divided into control and intensified training groups. In the intensified training group, training intensity, duration, and frequency were further increased via a protocol to induce overtraining; in the control group, these factors remained unaltered. In phase 4, training intensity was reduced. Standardized exercise tests were performed after each phase and hyperinsulinemic euglycemic clamp (HEC) tests were performed after phases 2, 3, and 4. Results-10 of 12 horses completed the study. Dissociation between mean glucose metabolism rate and mean glucose metabolism rate-to-plasma insulin concentration ratio (M:I) was evident in the intensified training group during steady state of HEC testing after phases 3 and 4. After phase 4, mean glucose metabolism rate was significantly decreased (from 31.1 ± 6.8 μmol/kg/min to 18.1 ± 3.4 μmol/kg/min), as was M:I (from 1.05 ± 0.31 to 0.62 ± 0.17) during steady state in the intensified training group, compared with phase 3 values for the same horses. Conclusions and Clinical Relevance-Dissociation between the glucose metabolism rate and M:I in horses that underwent intensified training may reflect non-insulin-dependent increases in glucose metabolism.  相似文献   

Preliminary Trial: Motility Comparisons of a Unique Freezing Technology (UFT) to Liquid Nitrogen Mist Methodology for Cryopreservation of Porcine Spermatozoa     

HA Goolsby  JR Blanton  PZ Cotter  SD Prien 《Reproduction in domestic animals》2004,39(5):328-332

The motility outcomes of boar semen frozen with newly developed freezing techniques using a new unique freezing technology (UFT) compared with traditional liquid nitrogen methodology were investigated with the intent of improving current fertility outcomes using semen. The UFT is an electronically controlled cooling chamber that houses an organic fluid bath that can be maintained at temperatures below 0 degrees C without solidifying to freeze samples. Four ejaculates from four different boars were collected for this trial. Samples were handled consistently during the pre- and post-freeze processing. From each ejaculate, samples were separated into eight cryopreservation treatment groups, six UFT variations and two control liquid nitrogen groups, immediately before freezing, in replicates of two. After the initial cryopreservation was complete, all samples were stored in liquid nitrogen for at least 48 h. Post-thaw motilities and original motility return percentages were assessed on a random, individual-sample basis. After the initial evaluations, samples from two boars were recollected and frozen using the UFT for breeding purposes. Four sows were bred with the UFT frozen semen to confirm fertility capability. When assessing the individual UFT techniques, all of six UFT techniques had improved post-thaw motilities. However, treatments F (micro = 29%, return micro = 37%) and J (micro = 27%, return micro = 34%) showed the highest statistical improvement for post-thaw (p < 0.05) and original motility percent returns (p < 0.05) when compared with either the control cryo-tube (micro = 15%, return micro = 19%) or straw groups (micro = 12%, return micro = 16%). The UFT semen had a 50% conception rate, with an average of seven piglets from the sows that farrowed. Our preliminary data suggest a higher motility return with a slower pre-freeze phase below the freezing point before the acceleration to liquid nitrogen temperatures. The preliminary data suggest that the UFT could be utilized as a potential cryopreservation option for boar semen.  相似文献