<正>微生态制剂又名益生素、促生素、生菌剂以及活菌剂等,是近年来新兴的一类饲料添加剂。它由多种有益微生物及其代谢产物和生长促进物质组成,能有效促进动物体调节肠道微生态平衡,增强机体免疫功能,并能高效转化饲料,改善生产性

<正>随着畜禽养殖业的集约化发展,抗菌药物作为饲料添加剂在促进畜禽生长、增强机体抵抗力,提高畜禽生产性能等方面发挥了重要作用,给畜禽养殖业带来了巨大的经济效益。抗菌药物饲料添加剂包括抗生素和化学合成抗菌药物添加剂两

采用正交试验L1(645)设计不同的发酵条件,观察不同发酵条件下植物乳杆菌N3对断奶仔猪料的pH值及乳酸菌、大肠杆菌、沙门氏菌数量的影响。试验设置为发酵时间(t)、接种量、发酵温度、pH值及湿度5因素4水平。初步得出结论:接种量10%(108CFU/ml),温度37℃,湿度65%,时间48h,pH值6.5时,饲料中有益菌乳酸菌含量较多,有害菌大肠杆菌含量较少。

随着畜禽养殖业的集约化发展,抗菌药物作为饲料添加剂在促进畜禽生长、增强机体抵抗力,提高畜禽生产性能等方面发挥了重要作用,给畜禽养殖业带来了巨大的经济效益.

<正>目前,大部分饲养场在仔猪养殖方面采用早期断奶的方法,目的是提高母猪的利用率,但却将仔猪推进了困境,一般仔猪在出生14～21d时断奶,对外界的适应能力差。断奶后,首先是仔猪的饮食发生了变化,由母乳直接变为粗硬的干料,因而减少了采食量。

目前,大部分饲养场在仔猪养殖方面采用早期断奶的方法,目的是提高母猪的利用率,但却将仔猪推进了困境,一般仔猪在出生14～21 d时断奶,对外界的适应能力差.断奶后,首先是仔猪的饮食发生了变化,由母乳直接变为粗硬的干料,因而减少了采食量.

The biological characteristics of a Lactobacillus plantarum(N3) were studied.The results showed that it was able to endure high temperature of 80~85 ℃ and high steam pressure of 0.20 kg/cm2,to decompose corn starch into lactic acid directly by 7.05%(36 h) and 8.19%(48 h),to endure the acid conditions by pH value 4.5.The total number of alive Lactobacillus plantarum was 4.1×106 CFU/g in the artificial gastric juice.It was sensitive to antibiotics,such as Aureomycin,Terramycin,Furazolidone and Norfloxacin,but it wasn't sensitive to the medicaments of preventing mildew.Above all,Lactobacillus plantarum(N3) was a better probiotics production germ.

The feeding experiment and the digestion trial were conducted to evaluate the nutrition value of piglet diet fermented by Lactobacillus plantarum N3′ FLF on weaning piglets. The production performance, serum biochemical parameter, histological parameter and apparent digestibility of nutrition components were determined to discuss the affecting mechanisms of Lactobacillus plantarum N3′ FLF on the performance of weaning piglets.

小肽能完整地被吸收并以二、三肽形式进入血液循环,小肽在蛋白质营养和生理调节中有着重要作用。本文就小肽的研究简史、吸收机制、生物学功能及在仔猪营养中的应用作一概述,重点阐述了当前国内外对小肽在仔猪营养中的应用研究。

黑素浓缩素(MCH)是由19个氨基酸残基组成的神经肽,最先从鲑鱼脑垂体内分离得到。MCH曾认为仅与黑色素的代谢有关,通过多年的研究,MCH的作用机制已基本清楚,主要认为MCH是通过2个受体起调控作用。参与多种生理过程,而目前研究的热点主要是MCH在调节进食行为和能量代谢方面的作用。MCH是至今所知的唯一一个剔除该基因就导致消瘦的下丘脑肽,MCH可提高采食和增重,可能与肥胖综合征的发病有关。结合国内外的研究情况,文章就MCH的研究概况、作用机制、生理功能以及与其它相关神经肽的关系进行综述,并初步探讨了MCH应用于动物生产中的作用和前景。

饲料蛋白质经胃肠道消化酶作用后,除降解为氨基酸外,更多的是以二、三肽的形式被吸收,才能达到最佳生产状态.本文根据生产实践和有关资料就小肽在仔猪营养中的应用研究进展作如下叙述.

采用正交试验L1(645)筛选出植物乳杆菌N3发酵断奶仔猪料的最佳发酵时间、接种量、发酵温度、pH值和湿度。试验结果显示,5因素对乳酸产率的影响次序依次为:接种量>温度>湿度>时间>pH值;最佳发酵条件为:接种量10%(108CFU/ml)、温度37℃、湿度65%、时间48h、pH值6.5。

The feeding experiment and the digestion trial were conducted with weaning piglets,which evaluated the nutritional value of lactobacillus plantarum.Compared with the control group,the final weight and the serum total protein in the trial group were significantly improved by 13.85%(P0.05)and 16.31%(P0.05),respectively;but the serum urea nitrogen decreased by 36.21%(P0.05).The trial group had improved the cell immunity level,the CD~+_4 and CD~+_4/CD~+_8 were improved by 22.22% and 16.95%,respectively.The lactic acid bacteria contents of the jejunum and the cecum in the trial group were improved by 9.65% and 18.11%,but the E.coli contents of the jejunum and the cecum decreasd by 9.26% and 12.32%,the Salmonella contents of the jejunum and the cecum decreasd by 5.93% and 17.58%;the villus length in the small intestine raised by 44.36%,while the gastric pits altitude in the fundic gland improved by 17.74%.

<span id="ChDivSummary" name="ChDivSummary" class="abstract-text">&lt;正&gt; 蜡样芽胞杆菌的生化、血清和噬菌体分型工作,不仅是本菌食物中毒流行病学调查的手段,而且也是本菌胃肠道外感染用于传染源追踪的有力工具。现就国内若干地区110株蜡样芽胞杆菌食物中毒菌株（以下简称蜡毒株）调查分析如下。材料和方法一、试验菌株;用作分型的110株蜡毒株,系全国蜡样芽胞杆菌检验方法科研协作组提供,分别来自十三个地区的食品卫生监督检验</span>