Is Resveratrol Effective in Protecting Stallion Cooled Semen?

The aim of this work was to evaluate the effect of resveratrol (RSV) during liquid storage of stallion sperm for 24 hours at either 10°C or 4°C. The antioxidant RSV was added to reduce the oxidative damage that occurs during cold storage. Aliquots of 2 mL of diluted semen were stored either at 4°C or 10°C under anaerobic conditions, in the absence (control group) or presence of RSV at different concentrations (10, 20, 40, and 80 μM). Sperm quality parameters were assessed at 0 hours and after 24 hours of storage. Resveratrol treatment did not affect sperm quality parameters at 0 hours. At 24-hour storage, a significant (P < .01) decrease of sperm quality was observed independently from RSV supplementation and storage temperature. A significant decrease of viable spermatozoa with high mitochondrial membrane potential (SYBR+/PI−/JC-1+) was evident at 24-hour storage in 40- and 80-μM RSV groups compared with control group. Moreover, a decline of total motility in 80-μM RSV group compared with the control group and a decrease of progressive motility and average path velocity in 80-μM RSV group compared with control and 20-μM RSV groups were observed. In conclusion, our findings demonstrate that RSV supplementation does not enhance sperm quality of stallion semen after 24 hours of storage. Moreover, 40- and 80-μM RSV concentrations could damage sperm functional status, probably acting as pro-oxidant. Finally, although 24-hour storage significantly affected most of the sperm quality parameters, no significant differences were found in groups maintained at 4°C or 10°C, suggesting that stallion semen could be equally preserved at these different temperatures.     

Application of Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry in Identification of Stallion Semen Bacterial Contamination

Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) is one of the cutting-edge methods currently applied in medical bacteriologic diagnostics. The aim of the study was to prove the possibility of applying MALDI-TOF MS to identify bacterial contamination in the ejaculate of stud stallions, which may cause infections to reproductive organs of mares following artificial insemination with cooled semen. A partial aim was to determine changes in the total count of microorganisms in long-term storage of ejaculate after its treatment with gentamicin and also without antimicrobial medication. Aerobic cultivation on Columbia agar was used to examine 26 semen samples from 13 horses; 31 different species of bacteria were isolated, which were identified by MALDI-TOF MS. The most frequently detected species came from Aerococcaceae, Staphylococcaceae, and Micrococcaceae families. The results of our work confirm that MALDI-TOF MS is a quick alternative method for identifying bacterial species that may contaminate stallion semen.     

火鸡精液液态低温保存

本文研究了3种稀释液在0～5℃下保存火鸡精液的效果及稀释液pH值、稀释比例和卵黄浓度对精子存活力的影响。原精及稀释精液Ⅰ、Ⅱ、Ⅲ不保存时,受精率分别为71.7％,64.03％,63.29％和63.77％(P<0.05);在0～5℃下保存48h后,原精完全丧失受精率(0％),而稀释精液Ⅰ、Ⅱ、Ⅲ的受精率分别为52.40％,45.30％和20.33％(P<0.01)。火鸡精液在0～5℃保存过程中,pH值降低,原精比稀释精液降低程度大。在本研究条件下,pH6.5和1:3稀释最适合于火鸡精子的存活,稀释液中添加5％或10％卵黄可提高火鸡精子的存活力。     

保存温度和不同种类稀释液对猪精液品质的影响

猪精液在室温保存时,含庆大霉素的稀释液保存效果优于含青、链霉素的稀释液,两种稀释液在保存72h时,精子活率、顶体完整率、GOT和LDH活性以及存活指数差异极显著(P<0.01).低温保存时,含蜂蜜和卵黄的稀释液对防精子冷刺激、维持精子活率的效果比含葡萄糖、奶粉的稀释液理想.在冷冻保存条件下,以含2%甘油的稀释液保存效果最佳.液态保存(室温、低温)的猪精液,LDH活性随精子活率下降而下降;pH值则都呈先上升后下降的变化趋势.室温保存主要是引起精子顶体脊膨大和保存后期的顶体前端膨大;低温保存主要引起顶体前部膨大和保存后期的少数顶体脱落;冷冻保存主要是造成顶体的膨大程度加大和顶体脱落.3种保存条件都造成精子线粒体透性增强.液态保存和冷冻保存精液的精清GOT活性与顶体完整率无显著相关性(P>0.05).     

鸵鸟精液品质及精液低温保存条件的研究

测定鸵鸟精液生理指标 ,结果表明 ,鸵鸟的射精量为 0 1 7～ 2 0 3mL ,精液 pH6 7～7 3,精子密度为 1 5 7～ 48 0亿 /mL ,原精液精子畸形率 3 0 9%～ 1 3 3% ,精子活率范围0 78～ 0 92。对鸵鸟精液用不同稀释液稀释后低温保存效果比较研究 ,初步获得在 0～ 5℃时用改进MEM液作稀释液以 1∶2比例稀释后 ,精子在设计的条件下存活时间平均约 72h ,而相应原精液或 0 85 %NaCl液作 1∶2稀释的精液在同样条件下精子仅能存活约 2 4h     

稀释粉对猪精液常温保存效果的研究

为了开发猪精液常温保存新型稀释粉,通过检测精子活率、质膜完整性、顶体完整性以及超氧化物歧化酶(SOD)活性、过氧化氢(H2O2)和丙二醛(MDA)产生量等指标,分析常温保存稀释粉对猪精液的保存效果的影响。结果表明,在常温保存条件下,自配稀释粉保存猪精液5d时间内,精子活率平均为0.63,精子顶体完整率和质膜完整率分别达到78.4%和48.6%;SOD活力、H2O2产生量和MDA产生量分别是177.39IU/mL、86.28mmol/mL和9.36nmol/mL,可以在生产实践当中应用。     

家禽精子迁移率Mobility是反映家禽精液质量的重要指标

精子活率是精子的重要特性,传统精子活率的评价方法并不代表精子在家禽机体内生殖道的真实运动情况,具有主观性的特点,准确性差。精子迁移率Mobility的测定方法模拟精子在母鸡体内液体环境和温度下的运动情况,能够反映精子在体内真正的活力。从37只纯种白洛克公鸡中挑选出具有不同精子迁移率Mobility的高、低2组,每组5只公鸡,其精子迁移率分别为1.103,0.219,相应的受精率分别为83.7%、76.8%(P<0.05)。结果表明:精子迁移率Mobility反映了不同家禽个体精液质量的差异,是预测人工授精效果的一个重要指标。     

Stallion Sperm Selection: Past,Present, and Future Trends

Although several selection techniques are available for processing spermatozoa, only colloid centrifugation has been used to any extent in this field, starting with density gradient centrifugation and progressing more recently to single-layer centrifugation (SLC). SLC through a species-specific colloid has been shown to be effective in selecting spermatozoa with good motility and normal morphology from stallion semen. The method is easier to use and less time-consuming than density gradient centrifugation, and has been scaled-up to allow whole ejaculates to be processed in a practical manner. The potential applications of SLC in equine breeding are as follows: to improve sperm quality in artificial insemination doses for “problem” ejaculates, to increase the shelf life of normal sperm doses, to remove pathogens (viruses, bacteria), to improve cryosurvival by removing dead and dying spermatozoa before freezing or after thawing, to select spermatozoa for intracytoplasmic sperm injection, and to aid conservation breeding.