共查询到20条相似文献，搜索用时 531 毫秒
1.
2.
试验旨在研究 Penergetic-T 对种公牛精液品质的影响,选择 120 头健康无疾病的西门塔尔种公牛随机分为试验组和对照组,每组 60头,每头牛为 1个重复。对照组饲喂基础日粮,试验组在基础日粮中添加 0.25 g(/ d 头)Penergetic-T,共饲喂 90 d,检测射精量、精子密度、冻精产量及精子活力、精子畸形率。结果表明:饲料中添加 Penergetic-T 种公牛鲜精的射精量、精子密度、冻后产量、精子活力及畸形率均优于对照组,且差异显著。说明,饲料中添加 Penergetic-T 可显著提高种公牛的精液品质与冻精产量,给种公牛站带来更多的经济价值。 相似文献
3.
酵母硒对种公牛精液品质影响的研究 总被引：1，自引：1，他引：0
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
4.
本试验旨在探讨在新疆褐牛种公牛日粮中添加不同水平N-氨甲酰谷氨酸(NCG)对其精浆激素水平及射精量和精液品质的影响。将20头新疆褐牛种公牛随机分为4组,每组5头,对照组饲喂基础日粮,试验Ⅰ组、试验Ⅱ组和试验Ⅲ组在基础日粮中每天分别添加15 g、30 g、45 g NCG,试验期为90 d。试验期内每周对试验牛进行采精,并测定其射精量、精子密度和精子活力;试验期第0、30、60和90 d对种公牛精液进行采集,并检测精浆中精氨酸、尿素和NO含量。结果发现,种公牛日粮中添加不同水平NCG,其射精量和精液品质均优于对照组;45 g/d N-氨甲酰谷氨酸(NCG)的添加量,能够显著提高新疆褐牛种公牛精液品质。种公牛日粮中添加45 g/d NCG试验至90 d,可有效提高种公牛精浆中精氨酸和NO含量,降低尿素浓度。 相似文献
5.
蜂花粉对热应激种公鸡精液品质及内分泌机能的影响 总被引：7，自引：0，他引：7
选用44只48周龄新扬州鸡公鸡随机分成4组，每组11只，对照组饲喂基础日粮，分别在基础日粮中添加0.5%，1.0%，1.5%的蜂花粉，作为试验Ⅰ、Ⅱ、Ⅲ组探讨蜂花粉对种公鸡精液品质及内分泌机能的影响。结果表明：日粮中添加1.0%，1.5%的蜂花粉均能显著提高公鸡的精液量、精子活力和精子密度，而对公鸡的精子畸形率和精液的Ph值影响不明显；与对照组相比，添加1.5%蜂花粉的试验Ⅲ组的公鸡血浆中三碘甲腺原氨酸（T3）、皮质醇含量显著降低，甲状腺素（T4）显著升高。上述结果提示；在热应激条件下，日粮中添加一定量的蜂花粉可有效缓解热应激，显著提高夏季种公鸡的繁殖性能并影响其内分泌机能。 相似文献
6.
本研究旨在评估硒来源对肉公牛生长性能、精液品质及血液指标的影响。试验将48头体重平均值为（355.43±3.18）kg的公牛随机分为3组，每组4个重复，每个重复4头。对照组饲喂基础全混合日粮（不添加硒），无机硒组饲喂基础全混合日粮+0.2 mg/kg硒（以亚硒酸钠形式），有机硒组饲喂基础全混合日粮+0.2 mg/kg硒（以硒代蛋氨酸形式）。试验持续10周。结果：有机硒组1～35 d肉牛平均日增重显著高于对照组（P＜0.05），但料重比显著降低（P＜0.05）。有机硒组肉牛在整个试验期的平均日增重显著高于对照组和无机硒组（P＜0.05），但料重比均显著低于其他两组（P＜0.05）。无机硒组和有机硒组肉牛的精液量、活精、精子浓度和精子输出占比均显著高于对照组（P＜0.05），同时有机硒组肉牛精子活力显著高于对照组（P＜0.05）。有机硒组肉牛精浆果糖浓度及血清硒浓度最高（P＜0.05），但有机硒和无机硒组精浆总蛋白、胆固醇浓度显著低于对照组（P＜0.05），但血清睾酮浓度显著高于对照组（P＜0.05）。结论：日粮添加0.2 mg/kg有机硒可以提高精液的各项指标，同时有机硒比无机硒更能有效改善精液质量和血清成分。
[关键词] 硒|肉牛|生长性能|精液品质|血液指标 相似文献
7.
选取31头年龄相近的健康荷斯坦种公牛,分别在2017年1、2、3月份饲喂三组不同日粮(精粗比43:57、37:63、33:67)。通过测定平均采精量、精子活力、精子密度,比较分析不同精粗比日粮对种公牛精液品质的影响。结果显示:平均采精量随日粮精粗比的降低而提高,饲喂精粗比33:67的日粮时平均采精量最高;平均精子活力随日粮精粗比的降低呈现不同程度的增加,其中饲喂精粗比37:63的日粮时平均精子活力最高,但各组间差异不显著;饲喂精粗比37:63日粮时种公牛的平均精子密度最高,显著高于精粗比43:57日粮,但与33:67组差异不大。试验结果表明:饲喂不同精粗比日粮对荷斯坦种公牛精液品质有一定影响,以精粗比37:63的日粮饲喂效果最好。 相似文献
8.
选用80只50周龄尼克T种公鸡随机分成Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ组,每组16只。Ⅰ、Ⅱ组为对照组,分别饲喂基础日粮和基础日粮添加鸡蛋,Ⅲ、Ⅳ、Ⅴ组为试验组,分别饲喂在基础日粮的基础上添加1%、2%、3%中草药复方添加剂的日粮,研究中草药复方添加剂对繁殖后期种公鸡精液品质的影响。结果表明,日粮中添加中草药复方添加剂能显著提高种公鸡的精液量和精子活力,降低精子畸形率,其中2%添加组效果最明显。说明在繁殖后期种公鸡日粮中添加一定量的中草药复方添加剂可以显著提高种公鸡的精液品质。 相似文献
9.
《养殖与饲料．饲料世界》2020,(1)
将20头大约克种公猪随机分为对照组和试验组,对照组饲喂基础日粮,试验组在基础日粮中添加1%中草药,研究复方中草药添加剂对种公猪精液量和精液品质的影响。试验结果表明,与对照组相比,试验组的精液量、精子活力、精子密度均显著提高,精子畸形率显著降低。说明在种公猪基础日粮中添加1%中草药可显著改善种公猪的射精量和精液品质。 相似文献
10.
为探究败酱草粉对采精应激公羊体况和精液品质的影响，选择体质健康的2～3岁健康公羊15只，随机分为5组进行试验。试验周期为30 d，试验期间测定5组公羊的采食量、饮水量和体重变化，在显微镜下观察并检测精液品质。结果显示：在公羊饲料中添加败酱草粉能够提高公羊的采食量与饮水量；并且提高公羊精子质量，其中败酱草粉处理3组最明显，采精量与对照组相比极显著升高（P<0.01），精子活力与对照组相比显著上升（P<0.05），精子密度与对照组相比极显著升高（P<0.01），精子畸形率与对照组相比极显著降低（P<0.01）。结果表明：在公羊日粮中添加12%败酱草粉能够缓解采精刺激应激，提高精液品质，并对败酱草粉的添加量有剂量依赖性。 相似文献
11.
12.
13.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
16.
以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
17.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
18.
19.
20.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献