共查询到20条相似文献,搜索用时 187 毫秒
1.
2.
3.
4.
<正>近年来,家禽发病规模和危害程度有逐年增大的趋势:禽类生长发育受阻、生产性能下降、疫苗免疫失败、继发感染、混合感染、交叉感染等情况日益增多,导致大批家禽死亡或淘汰,给养禽业造成了巨大的经济损失。究其原因,主要是由于家禽养殖过程中各种免疫抑制性因素的存在而引起。因此,消除家禽生产中广泛存在的各 相似文献
5.
6.
7.
8.
免疫接种是有效预防猪瘟发生的重要途径,通过有效免疫接种可大大降低猪瘟的发病率,从而提高养猪经济效益。但在猪瘟的免疫过程中存在一些不规范的因素,导致猪瘟免疫失败。认真分析免疫失败的原因,提出调整对策。 相似文献
9.
<正>疫苗免疫是预防控制动物传染病发生流行的有效措施之一,但是,在基层的免疫工作中,常常因为病原的变异、疫苗的质量、营养的环境、畜禽个体差异及其免疫水平、人员操作和免疫抑制因素等导致猪病免疫失败。因此,如何避免猪病免疫失败,充分确保疫苗的有效保护作用已成为当前防疫工作中急需解决的问题。本文将对猪病免疫失败的原因做一分析并提出相 相似文献
10.
从猪瘟疫苗的质量、免疫操作、免疫程序、猪群的饲养管理、健康状况以及药物及饲料添加剂等因素对猪瘟免疫的影响,进行猪瘟免疫失败的原因分析,从而提出对猪瘟免疫失败的防制对策,以控制猪瘟的地区散发性流行,促进养猪业的健康发展。 相似文献
11.
12.
13.
14.
15.
为研究饲料中不同苏氨酸水平对大口黑鲈生长性能、糖脂代谢、免疫及宠物级鸡肉粉利用率的影响,实验采用初始体质量为(4.16±0.06) g的大口黑鲈作为研究对象,设计3种等氮等脂的饲料:苏氨酸对照组(TC,65.0%鱼粉),低水平苏氨酸组(LT,65.0%宠物级鸡肉粉添加除苏氨酸以外的必需氨基酸含量至TC水平组)和苏氨酸添加组(TS,LT组添加苏氨酸含量至TC水平组),养殖实验开展8周。结果显示,与对照组相比,LT处理组饲料显著降低了大口黑鲈的生长性能、饲料效率和鱼体营养物质组成,饲料中添加苏氨酸可在一定程度上改善宠物级鸡肉粉完全替代鱼粉后导致的生长性能受限、饲料效率低下和鱼体营养物质组成降低等问题。宠物级鸡肉粉完全替代鱼粉还显著降低了血浆中营养成分和多种游离氨基酸的含量,饲料中添加晶体苏氨酸能够显著提高血浆中游离氨基酸的水平,使之与对照组间无显著性差异。mRNA水平上,饲料中添加苏氨酸可显著改善鸡肉粉完全替代鱼粉引起的肝脏中糖脂合成代谢抑制和分解代谢加剧的现象,同时添加苏氨酸也可显著降低细胞炎症因子的mRNA的表达水平。研究表明,饲料中适量苏氨酸的添加可在一定程度上提高大口黑鲈的生长性能... 相似文献
16.
全息生物技术在畜禽业中的应用 总被引:1,自引:0,他引:1
本文就动物养殖业中应用全息生物技术对公母猪的定域选种,哺乳动物睾丸、卵巢的再生,克隆技术,以及家禽种蛋和雏禽性别的鉴定等方面的研究作了阐述。特别是运用全息相关原理揭示了“阉割特异现象”产生的根本原因和根治技术,从而解决了“阉割”这项起源于中国的传统技术从历史上就一直悬而未决的弊端,使之扬长避短,不断臻于完善;否定了国内外许多学术权威关于“阉割特异现象是客观存在的”有关论断;并为克隆技术供体最佳年龄和部位的选择提出了新的思考;为养殖业中全息生物技术的应用扩开了新的视野。 相似文献
17.
18.
G Degani 《Aquaculture Research》2002,33(9):725-727
The apparent digestibility coefficient (ADC) of three diet ingredients serving as protein sources for adult sturgeon Acipenser guldenstadti × A. bester was studied using an inert marker in the feed and collecting the faeces by stripping. Each experimental diet contained a different protein source, fishmeal, soybean meal and poultry meal, making up 50% of the total, the other 50% being reference diet (28% fishmeal, 9% poultry meal, 24% soybean meal, 26% wheat flour, 8% poultry oil plus 0.5% vitamins, egg yolk, guar and chromic oxide). The digestibility of protein from fishmeal was 81.0%, from soybean meal 81.9% and from poultry meal 64.6%. Energy digestibility tests gave the following results: fishmeal 13.0 kJ g?1; soybean meal 12.1 kJ g?1; and poultry meal 10.2 kJ g?1. The differences in the ADC of various protein and carbohydrate sources are discussed. 相似文献
19.
Abstract— A pair of experiments were performed to assess amino acid supplementation of pet food grade poultry by‐product meal for utilization as the sole protein source for hybrid striped bass Morone chrysops×M. saxatilis. The first experiment determined the available amino acids from menhaden fishmeal and poultry by‐product meal for hybrid striped bass. The second experiment determined the efficacy of supplementing poultry by‐product meal with amino acids based on an ideal amino acid profile of hybrid striped bass muscle. The positive control diet contained 40% digestible protein solely from menhaden fishmeal and the negative control diet contained 40% digestible protein solely from pet food grade poultry by‐product meal. The negative control diet was additively supplemented with lysine, methionine, threonine, and leucine at 1.16,0.57,0.31 and 0.47% of the diet, respectively. Lysine supplementation alone did not improve fish performance based on any measured response. Moreover, the negative control diet and the lysine supplemented diet had lower weight gain and feed efficiency than the positive control diet. Supplementation of the diet containing pet food grade poultry by‐product with lysine and methionine; lysine, methionine, and threonine; or lysine, methionine, threonine, and leucine improved weight gain and feed efficiency above that of the negative control diet. The diet containing poultry by‐product supplemented with lysine, methionine, and threonine produced weight gains statistically indistinguishable from those of the positive control diet. Protein and energy retention efficiencies also improved with supplementation of at least lysine and methionine and were statistically indistinguishable from those observed in fish fed the positive control diet. Supplementation with lysine and methionine reduced the hepatosomatic index to levels similar to those found in fish fed the menhaden fishmeal diet. Intraperitoneal fat levels were similar among treatments (6.1‐6.6%) with the exception that fish fed the diet supplemented with lysine, methionine, and threonine exhibited lower (5.5%) fat levels. Supplementing the poultry by‐product meal diet with only lysine and methionine increased muscle ratio to levels equivalent to those found in fish fed the positive control (fishmeal) diet. In conclusion, amino acid supplementation of pet food grade poultry by‐product meal can be used to replace fishmeal in diets for hybrid striped bass without a reduction in fish performance. 相似文献
20.
中草药及其多糖在畜禽中应用的研究进展 总被引:1,自引:0,他引:1
中草药多糖一类多糖混合物,目前在治疗也预防家禽疾病方面越来越被人们重视,而且不需要休药期。文章以中草药多糖为研究对象,综述了预防以及治疗畜禽疾病上的应用,并对其提高畜禽机体免疫力做了简单阐述。 相似文献