共查询到20条相似文献,搜索用时 93 毫秒
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细菌性肠道感染是畜禽养殖过程中的常见疾病,易引起畜禽采食量下降、生产性能降低等问题,严重者甚至造成死亡。在养殖过程中多采用抗生素对其进行治疗,但由于抗生素长期大量使用,特别是不合理使用,使药物残留和细菌耐药性问题日益凸显。因此,发展安全可靠的抗生素替代品已然成为当今畜牧行业的研究热点。卵黄抗体(egg yolk immunoglobulins,IgY)是通过免疫接种产蛋鸡后,在蛋黄中表达的一种免疫球蛋白,可用于相应疾病的预防和治疗。IgY具有产量大、性质稳定、安全高效等诸多优点,目前IgY作为抗生素替代品已被广泛用于畜禽养殖过程中,并取得了显著的效果。文章介绍了IgY的分子结构、理化性质和作用机理,总结并比较了5种IgY提取方法的去脂率、抗体效价、总蛋白含量等指标,最后详细介绍了IgY在防治畜禽常见细菌性感染中的研究现状和应用前景,以期为IgY的高效生产及疾病防治提供研究依据和技术支持。 相似文献
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仔猪免疫能力低和腹泻是导致仔猪死亡率高的关键因素。因此,提高仔猪机体免疫九预防及治疗仔猪腹泻是提高仔猪成活率的关键。卵黄抗体(IgY)能迅速给仔猪提供被动免疫保护,并对肠道疾病具有有效预防及治疗作用。IgY能避免饲料中添加抗生素或某些化学合成药物所引起的药物残留和耐药性问题,具有绿色、高效、环保价值,对于畜禽业的健康持续快速发展有重要意义。这篇文章就卯黄抗体的形成、分子结构与功能、特点、作用机理及在仔猪生产中的应用作一综述。 相似文献
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卵黄抗体的特性及其在仔猪腹泻防治上的应用 总被引:3,自引:0,他引:3
仔猪腹泻是困扰养猪业的一大难题,早期断奶仔猪腹泻尤其严重.过去这一问题的解决通常是依赖抗生素或高免血清,但由于安全性和价格等因素影响了它们在养猪业的应用.卵黄抗体作为一种价格低廉、安全高效的新型兽药,在防治仔猪腹泻上展现出良好的应用前景.本文介绍了IgY的形成、分子结构、特点、吸收和转运以及IgY在防治仔猪腹泻上的应用. 相似文献
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夏俊钟 《国外畜牧学(猪与禽)》2016,(5):16-19
正卵黄抗体(IgY)作用广泛,今天主要介绍IgY在仔猪抗腹泻方面的应用。卵黄抗体的发现在二十世纪早期,而系统性研究发生在二十世纪七八十年代,这与困扰当时养猪业的仔猪腹泻有关。抗生素滥用问题和食品药物残留问题逐步受到关注,因此非抗生素保健治疗介质的开发越发受到重视。 相似文献
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鸡特异性卵黄免疫球蛋白(IgY)具有促进生长、预防仔猪腹泻等功能,并且不存在药物残留和抗药性等问题,是一种绿色、环保型饲料添加剂. 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引:1,自引:0,他引:1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. 相似文献
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嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.…… 相似文献
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