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B Gredler C Fuerst B Fuerst-Waltl H Schwarzenbacher J Sölkner 《Reproduction in domestic animals》2007,42(3):326-328
Genetic parameters were estimated for semen production traits collected in an Austrian AI centre in the years 2000-2004. In total, 12,746 ejaculates from 301 Austrian dual-purpose Simmental (Fleckvieh) AI bulls were examined considering different effects on ejaculate volume, sperm concentration, percentage of viable spermatozoa in the ejaculate, total spermatozoa per ejaculate and motility. The model for genetic parameter estimation included the fixed effects age of bull, collection interval, number of collections on collection day, bull handler, semen collector, year and month of collection, a random additive genetic component and a permanent environmental effect. Correlations between estimated breeding values for semen traits and male fertility from the routine evaluation were calculated. The fertility trait considered in the routine evaluation is non-return rate 90 for the first insemination. All semen production traits were moderately heritable. Heritabilities for volume, concentration, percentage of viable spermatozoa, total number of spermatozoa and motility were 0.18, 0.14, 0.10, 0.22 and 0.04, respectively. Correlations between breeding values for semen quality traits and routinely estimated breeding values for male fertility were low and ranged from 0.08 to 0.17 indicating that semen production traits are rather poor predictors of male fertility. 相似文献
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试验选用12头荷斯坦成年种公牛为试验牛,并随机分为四组。试验前期饲喂基础日粮,试验期添加不同剂量的酵母硒;90d时,采集种公牛的精液,并对精液量及精液品质进行检测。试验结果表明:日粮中适量添加硒能显著提高种公牛的精子冻前活率和冻后活率,并降低精子畸形率(P0.05),而对精液量、精子密度和精子顶体完整率无显著影响。 相似文献
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西门塔尔公牛精液品质季节性变化的分析 总被引:3,自引:0,他引:3
本文通过对8头西门塔尔公牛三年精液品质指标的统计,对其精液品质随季节变化的规律作了分析,并对变化的原车和生产实践中的有关问题进行了初步探讨。 相似文献
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本试验选择亚热带气候条件下广州地区的娟姗公牛和荷斯坦公牛各5头,比较两个品种公牛的精液品质(采精量、原精密度、原精活力、细管精液产量、冻后活力、低渗膨胀率及穿透率)。研究表明,荷斯坦公牛每次采精的采精量(16.14±0.06 mL)和细管精液产量(189.17±3.11支)都极显著地高于娟姗公牛(4.74±0.05 mL,158.46±2.64支)(P<0.01);娟姗公牛的原精密度(8.95±0.08亿/mL)极显著地高于荷斯坦公牛(8.32±0.07亿/mL;P<0.01);娟姗公牛原精活力(0.731±0.004)高于荷斯坦公牛(0.729±0.003),但两者差异不显著(P<0.05);娟姗公牛精液的冻后活力(0.355±0.003)极显著高于荷斯坦公牛(0.339±0.003;P<0.01);娟姗公牛冷冻精液的低渗膨胀率(34.50%±0.49%)显著高于荷斯坦公牛(31.21%±0.59%;P<0.01);娟姗公牛冷冻精液对去透明带仓鼠卵的穿透率(84.51%±13.83%)显著高于荷斯坦公牛(81.52%±6.13%;P<0.05)。 相似文献
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选择在广州地区亚热带气候条件下2岁~6岁的娟姗公牛5头,观察其精液品质(采精量、原精密度、原精活力以及细管精液产量)在全年不同月份的变化情况.结果表明:娟姗公牛的每次采精量和细管精液产量在气温较高的7~9月份会因为采精频率的减少而增加,10月份会因为周采精频率增加而使每次采精量和细管精液产量有明显减少;娟姗公牛的原精密度在气温适宜的2月份和采精频率较低的8月份会出现两个高峰值;娟姗公牛的原精活力在气温较高的月份会出现明显的下降趋势,2月份气温适宜时原精活力最好. 相似文献
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我国德系西门塔尔乳肉兼用牛推广情况及建议 总被引:1,自引:0,他引:1
2008年4月,根据农业部国际合作司与德国巴伐利亚州农林部签署的<关于推广应用德系西门塔尔(Fleckvieh)乳肉兼用牛种遗传物质和相关技术的合作协议>,中德双方具体实施单位-农业部全国畜牧总站和德国宝牛育种中心在北京联合举办了"德系西门塔尔(Fleckvieh)乳肉兼用牛推广项目"实施方案签字仪式暨新闻发布会.这标志着中德合作项目正式启动. 相似文献
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降温、平衡是冷冻精液生产过程中的重要环节。试验以本单位种公牛生产的精液为样本,使用低温平衡柜、测温仪、显微镜等仪器设备,研究降温、平衡对冷冻精液质量的影响。结果表明,采取一次稀释法,每盒中盛装细管精液适宜数量为100~300支;采取二次稀释法,每个烧杯中精液稀释后适宜容量为50~120mL.采取先灌装后降温、平衡,或先降温、平衡后灌装两种不同方法,对冷冻精液质量的影响差异不显著(P〉0.05)。在平衡柜温度为40℃环境下,精液从稀释后温度降至平衡温度的适宜时间为1~1.5h,平衡时间为3~4h。 相似文献
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不同季节和气候条件对种公牛精液品质的影响的研究 总被引:1,自引:0,他引:1
[目的]研究不同季节气候条件对种公牛精液品质的影响。[方法]从采精种公牛中随机抽出5头,选取气温最高(7月份)最低(1月份)和适中温度(4,9月份)进行试验,分别对不同时期所采得的精液进行检测。[结果]在最高温度月份7月份(25℃)时5头种公牛的平均精液量为5.88mL,原精活率67.2%,精液密度16.64亿/mL,冻后活率33.8%,生产冻精数143.4剂,精子畸形率23%。1月份环境温度平均在-11.2℃时,5头种公牛的精液量平均为5.7mL,原精活率66.8%,精液密度13.3亿/mL,冻后活率37.4%,生产冻精数为275.8剂,精子畸形率17.8%。在4,9月份环境温度12℃时精液量为6.6mL,原精活率73.2%,精液密度16.92亿/mL,冻后活率41.8%,生产冻精数404.4剂,精子畸形率12.6%。精液量之间差异显著(P〈0.05),原精活率之间差异显著(P〈0.05),精子畸形率之间差异显著(P〈0.05)。冻后活率和冻精生产数差异不显著。[结论]环境温度过高或者过低都会影响精液品质,种公牛在适宜的温度下生产的精液品质也会更加优良,种公牛在温度较高的条件下生产精液品质比在低温条件下还要差,种公牛最适宜的生产温度为12℃~16℃。 相似文献
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研究按季节和品种对种公牛采精记录进行方差分析,分别比较了季节对夏洛来、西门塔尔、利木赞、红安格斯、荷斯坦种公牛和弗莱维赫6个品种鲜精液品质的影响以及相同季节下的6个品种精液品质间的差异。分析了在季节和品种的双重条件下,精液品质间的相关性。结果表明:(1)西门塔尔、夏洛来和荷斯坦种公牛的单次射精量随季节变化排序均依次是:夏季秋季春季冬季。(2)西门塔尔、夏洛来、利木赞和红安格斯的鲜精子密度随季节变化排序依次是:春季夏季冬季秋季,且这四个品种鲜精子密度在四季的排序均为:西门塔尔夏洛来利木赞红安格斯。(3)各品种种公牛四季鲜精子活力排序均依次是:冬季春季秋季夏季;各品种种公牛鲜精子活力在四季的排序均为:利木赞夏洛来弗莱维赫、西门塔尔荷斯坦红安格斯;各品种夏季鲜精子活力均极显著低于其它三个季节(P0.01)。(4)荷斯坦种公牛鲜精子活力夏季占春季活力比率最高为(0.54/0.59),利木赞次之(0.5/0.63),弗莱维赫第三(0.47/0.6),安格斯最低(0.34/0.49)。(5)红安格斯的单次射精量、精子密度和精子活力在相同季节下都低于其它5个品种。(6)在不同季节不同品种下,种公牛的射精量与鲜精子密度和鲜精子活力的相关系数分别是0.006和~0.019,鲜精子密度和鲜精子活力的相关系数是0.253。 相似文献
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P. Christensen P.B. BrockhoffArticle no.: H. Lehn-Jensen 《Reproduction in domestic animals》1999,34(6):503-507
Contents
The value of routine evaluation of bull semen was analysed for 117 AI bulls placed in two studs. Data from semen analysis of a total of 1635 ejaculates was compared statistically with the nonreturn rates of the bulls. The semen parameters which were significantly correlated to nonreturn rates were the motility of the freshly collected ejaculates (p = 0.0140) and post-thaw motility (p = 0.0075). The total number of motile sperm in the inseminate ranged from 10.9 to 19.3 × 106 and according to previous reports the effects of low motility should be fully 'compensated' when doses above 10 × 106 sperm/dose are used for insemination. In conclusion, the motility of freshly collected semen does not appear to be 'compensation' and a low percentage of motile sperm in an ejaculate may indicate other dysfunctions of the population of motile cells. Furthermore, post-thaw motility appears to correlate significantly with nonreturn rates. The largest proportion of the variation was explained by the breed of the bull and stud (42.2% of the variation), whereas the two motility parameters explained 10% of the total variation in nonreturn rates. Objective and precise evaluation of sperm motility in combination with other semen traits are needed to improve breeding efficiency. Although microscopic evaluation of sperm motility correlates with nonreturn rates of bulls, the methods are subjectively assessed and inaccurate and therefore do not allow a satisfactory prediction of fertility. 相似文献
The value of routine evaluation of bull semen was analysed for 117 AI bulls placed in two studs. Data from semen analysis of a total of 1635 ejaculates was compared statistically with the nonreturn rates of the bulls. The semen parameters which were significantly correlated to nonreturn rates were the motility of the freshly collected ejaculates (p = 0.0140) and post-thaw motility (p = 0.0075). The total number of motile sperm in the inseminate ranged from 10.9 to 19.3 × 10
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日粮补锌对荷斯坦种公牛精液品质的影响 总被引:1,自引:0,他引:1
试验选用6头荷斯坦种公牛,研究了锌对性反射时间、精液品质、精清酶活性及血、精清锌与睾酮浓度的影响。结果表明:添加锌能显著提高精液的鲜精活力、精子密度、冻后精子活力和顶体完整率(P<0.05);性反射时间明显减少(P<0.01);鲜精精清中AKP和GOT活性组间差异不显著,但LDH活性2组显著高于1组(P<0.05);冻后精清AKP、GOT和LDH活性组间差异不显著(P>0.05)。添加锌能显著提高血清锌浓度(P<0.01),但对精清锌含量的影响不明显(P>0.05)。血清睾酮浓度1组显著高于2组(P<0.05),而精清睾酮浓度组间差异不显著(P>0.05)。 相似文献
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热应激对种公牛精液品质的影响 总被引:1,自引:0,他引:1
任何生物都依赖于其所处的环境 ,它对气候变化的适应及利用有效资源的能力是其存活的关键 ,因此 ,各种环境因子均可造成动物的生理应激 ,从而给动物的生产带来不利影响 ,牛也不例外。从经济角度看 ,在各种应激反应中 ,对牛影响最大的是热应激 ,而热应激对牛生殖机能会产生非常重要的影响。在热应激的作用下 ,种公牛的精液品质和受精率均显著下降 ,体内的一些血液生化指标也会发生明显变化。本文参考近年来国内外研究热应激的文献 ,论述了其对公牛繁殖性能的影响 ,以便于生产中制定缓解种公牛热应激的技术措施。1 热应激对种公牛繁殖机能的… 相似文献
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本文分析了陕西省秦川牛场秦川牛群近交及其对初生重、断奶重及哺乳期成活率的影响,并采用标准群体遗传学模型分析了秦川牛的致死当量。研究发现,30多年来秦川牛群平均近交系数呈明显的上升趋势,而且近交对成活率、初生重及断奶重均有一定危害;秦川牛群体的隐性有害基因含量较少,平均每个个体约携带2.05个致死当量。 相似文献
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选择胚胎移植获得的德系西门塔尔公牛11头,对其0~30月龄的体型外貌、生长发育、精液生产能力、抗病性及环境适应能力进行观察,分析其在山东地区的适应性。结果表明:其体型外貌特征符合本品系特征,外貌评分达特级;平均初生重46.32 kg,30月龄平均体重达955.45 kg,整个观察期平均日增重1.06 kg;30月龄体高达152.55 cm,体斜长172.73 cm,胸围、腹围与管围分别达到233.82、262.09和25.64 cm,睾丸围达41.23 cm;平均采精量6.60 mL,精子密度7.35亿个/mL,精子平均活力为56.23%,精液利用率67.99%,平均制冻数量28 642支;观察期无重大疾病发生。综上所述,德系西门塔尔种公牛在山东地区饲养达到了培育目的,适合在该地区推广。 相似文献
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AJ Michael C Alexopoulos EA Pontiki DJ Hadjipavlou‐Litina P Saratsis HN Ververidis CM Boscos 《Reproduction in domestic animals》2010,45(2):201-207
The objective of this study was to evaluate the quality of chilled dog semen processed with extenders containing various concentrations of N‐acetyl‐L‐cysteine (NAC). Ejaculates from five dogs were collected, pooled and evaluated for concentration, motility, rapid steady forward movement (RSF‐movement), viability, acrosomal integrity and by the hypo‐osmotic swelling test (HOST). In addition, superoxide anion (O2‐?) production, hydroxyl radicals (OH?) and total reactive oxygen species (tROS) were determined. The pool was divided into five aliquots, which were diluted to a final concentration of 66.66 × 106 spermatozoa/ml with Tris‐glucose‐egg yolk extender containing one of the following concentrations of NAC (0, 0.5, 1, 2.5 or 5 mm ). The semen aliquots were chilled and preserved at 4°C. Semen quality was evaluated after rewarming at 72 h. Sperm motility was significantly higher with the 0.5 mm concentration compared with the control group (p = 0.001). Rapid steady forward movement was higher with the 0.5 and 1 mm concentrations compared with the control and 5 mm group (p < 0.001). Viability and HOST percentages were not significantly altered. Compared with the control, the 5 mm concentration showed significantly reduced percentages of spermatozoa with normal acrosomes (p = 0.049). None of the ROS values at 72 h were significantly affected by the presence of NAC in semen extenders, although all NAC concentrations showed lower O2‐? and OH? values compared with the control. Only the concentrations of 1 and 5 mm inhibited the significant increase of tROS values after 72 h, compared with the fresh semen value. In conclusion, NAC supplementation of semen extenders is beneficial to semen motility of canine spermatozoa during chilling with the 0.5 mm concentration being the most effective, although no significant ROS inhibition was observed at 72 h. 相似文献