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本文对用最小抑菌浓度(MIC)、最小杀菌浓度(MBC)以及定量杀菌能力测定筛选出的4种消毒剂在规模化蛋鸡舍中消毒效果的影响因素进行研究,为建立规模化蛋鸡舍消毒程序提供依据。试验采用正交设计表L16(45)设计消毒种类、消毒浓度(mg/L)、喷雾量(mL/m3)、消毒时间(min)为影响消毒效果的因素,每个因素设计4个水平,用极差分析评价各因素对空气消毒效果的影响主次,用方差分析进行显著性检验。结果:消毒剂浓度对消毒效果影响极显著(P0.01);消毒剂种类对消毒效果影响极显著(P0.01);喷雾量对消毒效果影响显著(P0.05);消毒时间对消毒效果影响不显著(P0.05)。结果表明,在对规模化蛋鸡舍进行消毒时,使用同种消毒剂情况下浓度是影响消毒效果的主要因素。 相似文献
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为了解竹醋液对鸡场消毒、除臭效果，本研究选择3栋蛋鸡舍，分别开展了竹醋液不同喷淋浓度、喷淋强度和喷淋时间对鸡舍空气沉降菌杀灭和氨气、硫化氢臭气降解效果研究。结果显示，竹醋液原液稀释150倍，喷淋强度按150 mL/(m2/min),每日喷淋2次，每次喷淋20 min,可经济有效地对鸡舍进行带鸡消毒和除臭。 相似文献
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为研究冬季鸡舍环境因子对蛋鸡生产性能和蛋品质及血液指标的影响，试验以全封闭笼养蛋鸡舍为研究对象，2021年10—11月在鸡舍的前、中、后位置分别设置前试验组、中试验组和后试验组，每日监测鸡舍内环境因子（温度、相对湿度、CO2浓度、NH3浓度）和生产性能指标，分析试验第30天蛋品质和血液抗体指标的变化。结果显示：舍内3个试验组温度、CO2浓度和NH3浓度存在显著差异，中试验组温度和CO2浓度显著高于前、后试验组（P<0.05），后试验组NH3浓度显著高于前、中试验组（P<0.05），中、后试验组相对湿度显著高于前试验组（P<0.05）；后试验组蛋重显著高于前、中试验组（P<0.05），中试验组蛋壳厚度、IgA水平及IgG水平显著高于前、后试验组（P<0.05），中、后试验组IgM水平显著高于前试验组（P<0.05）；相关性分析结果显示，鸡舍内温度与CO2浓度呈显著正相关（P<0.01），相对湿度与NH3浓度呈显著正相关（P<0.01），温度和产蛋率呈显著负相关（P<0.01）。研究表明，鸡舍内不同位置环境参数与蛋鸡生产性能、蛋品质及血... 相似文献
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蚯蚓粪除鸡合臭气效果的试验报告 总被引：2，自引：0，他引：2
畜牧业的集约化饲养越来越普遍，畜禽臭气得不到有效的控制，影响了养殖业本身的发展，同时又危害人类健康。目前，除臭的方法主要有阻止臭气化合物的产生和降低臭气化合物的挥发两种。本文使用了蚯蚓粪作为鸡舍的垫料降低臭气化合物中主要污染气体氨气和硫化氢的挥发。对鸡的饲养环境有了重大改善。 相似文献
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《中国家禽》2021,(10)
为找到东北地区蛋鸡舍冬季保温和通风的平衡点,并将舍内环境条件控制在适合蛋鸡生长的范围内,试验对吉林省某蛋鸡舍温度、湿度、二氧化碳浓度、有害气体浓度和颗粒物浓度等环境因素进行连续监测,分析其分布规律和相互关系。结果显示:舍内平均温度22.1℃,平均相对湿度67%,不同监测点温湿度存在差异;平均氨气浓度为3.21 mg/m~3,其浓度和温度呈正相关,和相对湿度呈负相关;舍内颗粒物浓度分布情况为PM_1和PM_(2.5)浓度近风机端舍中远风机端,PM_(10)和TSP与之相反,即远风机端舍中近风机端;舍内CO_2平均浓度为8 576 mg/m~3,高于相关标准。基于CO_2浓度对试验鸡舍通风策略进行优化,得出该试验鸡舍最小通风量为0.56 m~3/h·kg,以及东北地区采用传送带清粪方式的蛋鸡舍应保证的冬季最小通风量为0.51～0.58 m~3/h·kg。 相似文献
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Ⅶ如何提高蛋壳质量随着良种蛋鸡的引入和集约化养鸡业的发展，对蛋壳质量的研究越来越深化．蛋壳质量的好坏，直接关系到蛋破损率和孵化率高低，关系到养鸡的经济效益．1影响蛋壳质量的因素影响蛋壳质量的因素很多，有营养性因素、药物性因素、鸡舍环境温度和某些疾病等．1.1营养性因素口粮中营养素直接影响蛋壳质量，如钙、磷的含量及比例，特别是维生素D。影响更大．若日粮中钙的含量不足，鸡产薄完蛋，软壳蛋，严重时产蛋减少，健康受损．1只年产300个蛋的母鸡，由蛋排出的钙量约680g，相当鸡只全身钙量的30倍．饲料中钙的吸收率一般为… 相似文献
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抑氨菌液改善笼养蛋鸡舍环境的效果 总被引：1，自引：0，他引：1
试验旨在研究不同频率喷洒抑氨菌液对笼养蛋鸡舍环境的影响。3间鸡舍分别饲有900只54周龄新杨褐、白羽(新杨绿、海兰灰)和海兰褐蛋鸡。试验1、2、3期分别按照3 d1次、2 d1次、1 d1次的频率以0.5%比例喷洒抑氨菌液;每天4次记录温度、湿度、NH3浓度和CO2浓度,并记录每日风机开关时间,测定硼酸吸收液中氨氮浓度和生理盐水中细菌和真菌数量。结果表明:NH3浓度、CO2浓度、吸收氨氮浓度、细菌和真菌数量不同程度地受到鸡舍内温度、湿度、风机运行时长和测定位置的影响;各环境参数受测定时风机开关状态的影响;鸡舍内NH3浓度在1~3 d内明显随鸡粪堆积时间的延长而升高;每天喷洒一次抑氨菌液能明显降低有害气体浓度。结果表明,笼养蛋鸡舍环境受多种因素的影响,每天喷洒1次抑氨菌液能明显改善舍内空气质量。结果表明,每天喷洒一次抑氨菌液能明显改善舍内空气质量。 相似文献
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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
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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
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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
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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
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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