草坪草种子活力测定方法的比较研究

试验以常规贮藏8个月的6个品种草坪草种子为材料,采用幼苗生长测定、电导率测定、加速老化试验、模拟田间出苗率测定等4种方法测定种子活力。结果表明,不同品种草坪草种子活力存在显著差异,幼苗生长测定和加速老化试验的发芽率、简化活力指数均与模拟田间出苗率存在极显著正相关。研究认为,幼苗生长测定和加速老化试验,均是草坪草种子活力测定的较好方法。     

Evaluation of different cryoprotectants (CPAs) in boar semen cryopreservation

This study was performed to evaluate the use of dimethylacetamide (DMA) and dimethyl sulfoxide (DMSO) in boar sperm cryopreservation. Semen from eight boars was cryopreserved following treatment with 3, 5, and 7% DMA and DMSO, and 3% glycerol (control). After thawing, sperm conventional parameters and membrane integrities were evaluated. There were no significant differences among different DMA concentrations in all evaluations. Membrane intactness were higher in 5% and 7% DMSO than 3% DMSO (P<0.05). Sperm motility of 5% DMSO was lower than that of 3% glycerol (P<0.005), and membrane intactness were lower in 5% DMA and DMSO than 3% glycerol (P<0.05). DMA and DMSO didn't improve sperm quality and glycerol remains the most useful for boar sperm cryopreservation.     

ATP content and sperm motility of extended bovine semen under different storage conditions.

The effects of incubation temperature (+20 degrees C vs +35 degrees C) and media type on the ATP content and motility of spermatozoa were determined in fresh bovine semen in order to develop a method for assaying post-thaw quality. Semen was obtained from 3 bulls at 2 occasions. The spermatozoa were washed using a Ficoll-containing medium before being resuspended in each of 4 different media (I. 0.9% NaCl; II. Tris-buffer solution; III. seminal plasma; IV. seminal plasma+Tris-buffer solution) and incubated for 6 h. The least-squares means for ATP content were higher (p less than or equal to 0.05) at +20 degrees C than +35 degrees C for all media except no. I. By contrast, the least-squares means for sperm motility were higher (p less than or equal to 0.05) at +35 degrees C than at +20 degrees C in media II and III. A decrease over time in ATP content and motility at both temperatures was also observed. The single most important factor responsible for changes in ATP content and sperm motility was the temperature and the medium, respectively.     

牛结核病不同检测方法的比较研究

[目的]为达到迅速准确诊断牛结核病的目的,[方法]用2年时间对我国最常用的牛结核病检测方法进行了对比研究.[结果]试验结果表明,国标皮内变态反应试验(PPD)与皮内变态反应比较试验(SICTT)有较高符合率;国标皮内变态反应试验(PPD)阳性敏感性高于皮内变态反应比较试验(SICTT);皮内变态反应比较试验(SICTT...     

营养酸模种子在不同处理条件下的发芽对比试验研究

试验以营养酸模进口原种、培育原种、栽培用种及野生巴天酸模种作为试验用种，设置4个试验组，分别在不同温度（恒温湿置和变温浸泡）下和不同药物浸种（药物置床和药物浸种）预处理下进行了发芽对比试验。试验结果证实：恒温湿置和药物置床均不利于酸模种子萌发，只有在变温浸泡和药物浸种相配合下才能获得较高的发芽势和发芽率，万以变温20－60℃与0.25% SNF－1浸种剂相结合处理破除营养酸模种子休眠状态，可使其发芽率达到最高98．8％（P＜0．01），同时证实，课题组研制的SNF－1浸种剂是一种提高营养酸模种子发芽率的理想专用浸种剂。     

不同稀释剂对梅山猪精液冷冻保存效果的研究

为了探讨稀释剂对梅山猪精液冷冻保存效果的影响,本文选用3种不同的常温稀释液进行常温保存试验,结果发现配方Androhep(A)、Schonow(B)优于葡-柠-EDTA(C)。选用常温配方A、B与3种冷冻稀释液进行配伍组合试验,应用液氮熏蒸法制成试管冻精,结果表明:1A稀释液组合在精子活力和顶体完整率均优于其他组合,解冻后精子活率最高达0.55;不同时间点保存效果检测结果显示,解冻后精子活力和顶体完整率指标稳定。     

Comparative studies of the persistence of animal mycoplasmas under different environmental conditions

A comparison of the persistence of mycoplasmas in animals was carried out. When inoculated into liquid media, strains of Mycoplasma bovis, M. arginini, Acholeplasma laidlawii, and A. axanthum persisted for 59-185 days post-inoculation. The survival periods were not significantly influenced by temperature (4, 30, 37 degrees C, and room temperature). The survival periods for M. bovigenitalium, M. gallisepticum, M. bovirhinis, and M. gateae ranged from <7 to 185 days depending on medium components and temperature. Further, it was determined that strains of M. bovigenitalium, M. bovis, M. bovirhinis, M. arginini, and A. laidlawii persisted in a dry paper disc for at most 28, 126, 154, 56 and over >168 days at 4 degrees C, respectively. At 4 degrees C, strains of M. gallisepticum, M. columborale, M. edwardii, M. felis, and M. gateae survived for at most 28, 21, 42, 28, 28 and 70 days, respectively. At 30 degrees C, strains of M. bovis, M. bovirhinis, M. arginini, A. laidlawii, and M. gallisepticum persisted for at most 28, 84, 56, >168 and 14 days, respectively, but strains of M. gallisepticum, M. columborale, M. edwardii, M. felis, M. gateae, and U. diversum did not survive for more than 14 days. In an outdoor environment, strains of M. bovirhinis and A. laidlawii survived for at most 28 and 14 days, respectively. Finally, it was found that 14 isolates of M. gallisepticum persisted for periods similar to those of the reference strains. The results under dry conditions at a variety of temperatures presented contribute to understanding the epizootiology of mycoplasmal infections in the field.     

天山马鹿细管冻精的制备和应用

选择16头天山马鹿种公鹿电刺激采精,通过探讨不同稀释液和甘油浓度等条件对精液冷冻处理的影响,拟建立一种天山马鹿精液冷冻的方法,并对冷冻精液品质和人工授精效果进行评定。结果表明:天山马鹿对电刺激采精有耐受性,麻醉保定的采精频率每周2次最佳,10月中旬精液品质最好;6%甘油的稀释液冷冻效果最优;细管冻精活率(48.14&#177;13.15)%,顶体完整率(56.34&#177;14.84)%;诱导同期发情和自然发情人工授精情期产羔率分别达到50.80%和78.50%。     

精液不同稀释方法对母羊受胎率的影响

通过对同品质的公羊精液做几种不同方法的稀释后人工授精 ,结果表明差异显著 (P <0 0 5 ) ,表明精液的不同稀释方法对羊的受胎率有显著影响     

不同冷冻方法对水牛体外生产胚胎冷冻效果的研究

本研究采用不同来源的体外生产胚胎(屠宰场卵巢IVF胚胎,OPU-IVF胚胎,SCNT胚胎),系统研究了不同冷冻方法对水牛体外生产胚胎冷冻效果的影响,以完善水牛体外生产胚胎冷冻方法,进一步提高胚胎冷冻效果。试验选用6～7日龄囊胚分别用不同的冷冻液和不同冷冻方法进行胚胎冷冻。玻璃化冷冻液分别为40%EG、25%EG+25%DMSO和20%EG+20%DMSO+0.5 mol/L蔗糖;程序化冷冻液分别为10%甘油和0.05 mol/L海藻糖+1.8 mol/L EG+0.4%BSA。结果表明:(1)在玻璃化冷冻中,无论何种胚胎不同冷冻液的冷冻效果有明显的差异,但均以20%EG+20%DMSO+0.5 mol/L蔗糖作为冷冻液的冷冻效果最好,并且高于程序化冷冻的存活率;而对于程序化冷冻,用10%甘油作为冷冻液,屠宰场卵巢IVF胚胎的冷冻后存活率略高于用0.05 mol/L海藻糖+1.8 mol/L EG+0.4%BSA的冷冻后存活率,但差异不显著(P>0.05)。(2)VF胚胎利用程序化冷冻胚胎解冻后,在0～24 h内有76.5%胚胎复活,高于玻璃化冷冻的复苏率(48.9%)(P<0.05);而与此相反,在24～48 h内,玻璃化冷冻胚胎的复苏率(42.6%)则高于程序化冷冻(23.5%)(P<0.05)。综上所述,各种来源的水牛体外生产胚胎均可进行冷冻保存,应用玻璃化冷冻的效果好于程序化冷冻,且以20%EG+20%DMSO+0.5 mol/L蔗糖作为冷冻液进行玻璃化冷冻效果最好,但程序化冷冻后的胚胎复苏速度明显快于玻璃化冷冻的速度。