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笼养蛋鸡疲劳综合症是青年母鸡的一种营养紊乱性骨骼疾病。随着饲料业提高了蛋鸡饲料中钙的水平,如今本病的发生率与30年前相比降低了许多,但本病所造成的蛋鸡死淘率在总死淘率中占的比例还很高。1发病特点本病多在炎热的夏季发生,高产蛋鸡在产蛋上升期至高峰期(140￣210日龄)发病,产蛋高峰过后不再出现,产蛋上升快的鸡群多发。发病时鸡群表现正常,采食、饮水、产蛋、精神都无明显异常变化,在晚上关灯时也无病鸡,而在早晨喂料时发现有死鸡,或有病鸡瘫在笼子里,若发现早,将病鸡放在舍外,自行产出1枚蛋或人工助产后便恢复正常,也不再发病。2症… 相似文献
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蛋鸡疲劳症又称笼养蛋鸡骨质疏松症,是笼养蛋鸡的一种全身性骨骼疾病,几乎发生在所有笼养产蛋鸡群中,产蛋期发病率为1%~10%,常发生于产蛋高峰期,是近几年来蛋鸡生产中最突出的条件病。发病鸡大多是进笼不久的新开产母鸡和高产鸡,夏 相似文献
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笼养海赛克斯产蛋鸡疲劳症的临床观察 总被引：2，自引：0，他引：2
笼养蛋鸡疲劳症简称ＣＬＦ，又称笼养蛋鸡骨质疏松症，是当前商品蛋鸡生产的一种严重的营养代谢病，近年来在我国一些集约化养鸡场时有发生。本文就发病鸡群的临床症状、病理变化、饲料营养以及血液生化指标的变化等方面进行分析。１发病概况扬州郊县某饲养场饲养不同日龄蛋鸡８０００只，其中海赛克斯产蛋母鸡３０００只。该鸡群从９０日龄上笼，预防免疫接种按正常程序进行。鸡群状况一直良好，喂的自配饲料，１４０日龄开产，开产后产蛋持续上升，至２２０日龄当产蛋率达到８５％的数天后，鸡群中部分鸡出现拉稀，薄壳蛋、破损蛋增加，蛋… 相似文献
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董永军 《养殖与饲料．饲料世界》2006,(5):44-44
笼养蛋鸡疲劳症，又称笼养蛋鸡骨质疏松症，是笼养蛋鸡特有的代谢性疾病，是由多种因素引起的成年蛋鸡骨钙进行性脱失，造成骨质疏松的一种营养不良性疾病。该病1954年首次发现于美国南部的一些地区，我国在上世纪90年代初发现此病。发病鸡大多是进笼不久的鸡或高产鸡。病鸡初期表现为腿软无力，站立困难，继而蹲卧不起，两腿麻痹，最后因脱水，衰竭而死亡。同时产蛋过程中出现软壳蛋、无壳蛋。 相似文献
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笼养蛋疲劳症又称笼养产蛋鸡骨质疏松症或笼养鸡瘫痪,美国称本病为产蛋鸡猝死症。该病是笼养鸡骨骼疾病中最严重的疾病之一,也是现代化蛋鸡生产中最突出的代谢病,发病鸡大多是进笼不久的鸡和高产鸡。它所造成的损失是多方面的,主要引起产蛋鸡的瘫痪、死亡以及产蛋下降,还影响鸡的屠宰加工。大中型鸡场发病率很高,发病严重的鸡群,每月损失超过10%,使生产受到巨大损失。1)临床症状。①最急性型发病鸡往往突然死亡,初开产的鸡群产蛋率在40%～60%时,死亡最多,死亡前无症状。表面健康、产蛋较好的鸡群,白天挑不出病鸡,但次日早晨可见到蛋鸡死亡。… 相似文献
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《中国畜牧兽医文摘》2012,(8)
<正>产蛋鸡猝死又称产蛋鸡疲劳综合症,是蛋鸡生产中常见的条件病。发病多是进笼不久的新开产和产蛋接近高峰期的母鸡,夏季和温度较高时易发,所以又称新开产母鸡病和蛋鸡夏季病。1流行特点1.1主要发生在产蛋鸡,以初产母鸡和产蛋上升期的鸡群多发。1.2出现死亡鸡一般多在夜间,白天看似鸡群无异常,但在早晨喂鸡时发现死鸡,而且是个大、健壮的鸡只死亡。1.3鸡笼里时常出现卧笼的瘫鸡、排不出蛋而难产的死鸡,伴随 相似文献
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笼养蛋鸡疲劳症的诊治 总被引：1，自引：0，他引：1
笼养蛋鸡疲劳症,又称笼养蛋鸡骨质疏松症,是笼养蛋鸡的一种全身性骨骼疾病,该病几乎发生在所有笼养产蛋鸡群中.它的临床症状主要是引起产蛋鸡的跛行、瘫痪、死亡及产蛋下降.发病的时间大多数是进笼不久和处在产蛋高峰期的鸡只,产蛋期的发病率一般为1%～10%,此病在国外称为"脆骨症". 相似文献
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产蛋疲劳症又称笼养产蛋鸡骨质疏松或笼养鸡瘫痪，是笼养鸡骨骼疾病中最严重的疾病之一，也是现代化蛋鸡生产中最突出的代谢病，主要引起产蛋鸡的瘫痪、死亡及产蛋下降。发病的大多是进笼不久的鸡和高产蛋鸡，夏季最容易发生。据1997～1999年对我市一些大、中型鸡场发病情况的调查结果表明，发病率很高，发病严重的鸡群，每月损失的鸡只超过10％。一、临诊症状产蛋疲劳症主要有以下三种表现形式，即最急性型、急性型和慢性型。1最急性型发病鸡往往突然死亡，初开产的鸡群产蛋率在40％～60％时，死亡最多，死亡之前看不出发病症状。在表面… 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