母猪病毒性繁殖障碍病之细小病毒病的诊断与防洽

猪细小病毒（porcine parvovirus,PPV）病是引起猪繁殖障碍的主要病原之一。本病临床症状主要表现为胚胎和胎儿的感染及死亡，呈现早产，流产．死胎，畸形和木乃伊、弱仔，产仔不足以及不孕等繁殖障碍．而母猪本身通常并不表现明显的临床症状。在健康猪场，PPV一旦传入猪群．初发发病的各胎母猪都可能发生流产死胎和木乃伊；在本病流行区内或猪场7月龄以后的初产母猪往往容易发生流产死胎和术乃伊等现象。     

母猪繁殖障碍疾病的诊断及防制

母猪的生产性能是养猪业发展的关键环节,但近几年母猪繁殖障碍疾病却困扰着各个种猪场、户,造成很大的经济损失.母猪繁殖障碍疾病,以妊娠母猪发生流产、早产、产死胎、木乃伊胎、畸形胎、少仔和各种不育症为主要特征.母猪繁殖障碍病因多而复杂,有非传染性因素,也有传染性的因素.     

繁殖障碍型猪瘟的诊断与防治

自 8 0年代以后 ,猪瘟无论是病原、流行形式 ,还是临床表现和病理变化 ,均发生了明显的改变 ,出现温和型 (非典型 )猪瘟 ,特别是怀孕母猪感染常呈带毒者 ,不表现明显的临诊症状 ,但怀孕的母猪常引起流产、死胎和木乃伊化 ,母猪表现持续性病毒血症等症状 ,给养猪业带来了巨大的经济损失 [1～ 3 ]。临诊上引起猪繁殖障碍的病因很多 ,尽早的确诊病因 ,对于及时采取措施防止繁殖障碍发生是非常关键的 ,基于此本文对引起母猪繁殖障碍型猪瘟进行了研究 ,报告如下。1　流行病学与症状　1 997年 5月至 1 998年 2月 ,山东省烟台市某猪场初产和经产母…     

青海省规模化猪场母猪繁殖障碍疾病的检测

近年来青海省猪场中母猪繁殖障碍性疾病不断增加，各猪场普遍存在母猪不育、流产、产死胎、弱胎、木乃伊胎和弱仔猪增多的情况，给养猪业带来了较大的经济损失。为了给今后的综合防制工作提供科学依据，笔者于2003年在该省2个种猪场中应用酶联免疫吸附试验(ELISA)、间接血凝试验(IHA)、     

母猪繁殖障碍病之猪衣原体病及其防治

猪衣原体病又称鹦鹉热（Psittacosis）或鸟疫（Ornithosis）,主要是由鹦鹉热衣原体引起的一种接触性人兽共患传染病。各种年龄的猪均能感染，但临床表现有所不同，母猪主要表现为流产、死胎．产弱仔传染性不育等繁殖障碍。     

一起慢性猪瘟引起的母猪繁殖障碍的诊治

1发病经过2003年2～6月,几个邻近的猪场发现初产母猪及经产母猪流产、死胎和初生乳猪短期内大量死亡的现象,且存活下来的仔猪被毛无光泽,皮肤色淡、发干、发育不良。场方技术员进行治疗,未见成效。笔者经过调查,此区此前发生过猪瘟,损失很大,通过接种猪瘟弱毒疫苗等,疫情得到了控制,因此,兽医防疫部门加强了对此地区猪群的细小病毒、伪狂犬、猪繁殖与呼吸系统综合症、乙型脑炎等疫病的防疫。据调查统计,在此期间,发生流产,死亡率达16.6%,初生仔猪死亡率达19.3%;还有整窝或一窝一头或几头仔猪有先天性肌肉震颤、共济失调、抽搐等现象。从发病…     

一起母猪繁殖障碍性疾病的诊断

菏泽某猪场母猪妊娠后期出现流产,产出死胎、木乃伊胎,伴有发热和呼吸道症状,仔猪有呼吸道症状且死亡率高。对发病猪场进行实地走访,观察症状、剖检观察病变并采集病料,经涂片染色镜检、金标卡检测和RT-PCR检测,结果表明该猪场的疫情由猪繁殖与呼吸综合征病毒、猪瘟病毒和弓形虫混合感染引起。     

一起母猪繁殖障碍疾病的诊治报告

以流产、产死胎、木乃伊胎及弱仔为主要特征的母猪繁殖障碍疾病给现代养猪业造成了重大的经济损失。引起母猪繁殖障碍的因素主要有两类:一类是由PRV、PPV、PRRSV、JEV、HCV和寄生虫等引起的传染性因素,另一类是由细菌、毒素、环境、营养和遗传等引起的非传染性因素。但是,往往以传染性因素(尤其是病毒)的影响更加令人关注。目前,虽然各个规模猪场对母猪都进行了常规的疫苗免疫,但引起     

母猪繁殖障碍疾病的诊断及防制

近几年来我国各地种猪场发展较快 ,但母猪繁殖障碍疾病困扰着各个种猪场。据调查母猪繁殖障碍疾病在各种猪场有不同程度存在。母猪繁殖障碍病因多而复杂 ,有非传染性因素 ,也有传染性的因素。本文主要叙述由病原微生物导致的母猪繁殖障碍疾病 ,也是当今重要致病因素。包括有猪伪狂犬病、猪细小病毒感染、母猪繁殖与呼吸综合征、猪乙型脑炎、猪瘟、猪布鲁氏菌病和猪衣原体病等。重点阐述各种疾病的流行特点、特征性的临床症状和病理变化 ,以及各种疾病的诊断方法 ,并且提出综合防制方法     

妊娠母猪营养研究进展

中国规模化猪场母猪年提供的断奶仔猪数(PSY)及产肉量比欧美发达国家低30%～40%,究其原因在于品种选育、营养与饲养管理、疾病防控等各环节的不足。妊娠母猪的受胎率、早期胚胎存活、胎儿的生长发育受到营养及饲养管理的显著影响,是决定母猪繁殖效率的关键原因。国际国内考察营养对妊娠母猪繁殖性能的影响所涉及的营养素以能量、氨基酸、功能性添加物为主,而维生素、微量元素方面的研究较少。本文重点综述了近年来营养对妊娠母猪繁殖力的调控效应,为养猪生产者制定合理的营养与饲养管理程序提供参考。     

紫花苜蓿对母猪生产性能的影响

紫花苜蓿Medicago sativa粗蛋白含量高,氨基酸平衡,粗纤维利用率高,且含有丰富的维生素、矿物质,其中的β-胡萝卜素、维生素E、维生素B2、叶酸和硒等可以降低母猪胚胎死亡率,增加窝产仔数,延长母猪的利用年限。因此,在母猪饲粮中添加适量紫花苜蓿鲜草或草粉代替部分精料,能降低饲料成本,提高母猪的生产性能。研究主要综述了紫花苜蓿粗纤维和几种重要维生素对母猪生产性能的影响。     

母猪衣原体病的诊断与防治

近年来 ,关于母猪流产报道不少 ,一般认为由乙型脑炎、或细小病毒、布鲁氏菌病、繁殖障碍型猪瘟、伪狂犬病以及“蓝耳病”等引起。呼吸系统疾病通常认为由猪肺疫、沙门氏菌、霉形体肺炎、萎缩性鼻炎以及链球菌性肺炎等引起。至于猪衣原体性流产和衣原体性肺炎报道甚少。 1 999年 1 0月份 ,福建省莆田市某猪场繁殖母猪突然发生流产、死产、早产。起初因治疗不力 ,终呈肺部病变而死亡。后经采样送检至湖北省农科院畜牧兽医研究所实验室诊断为猪衣原体病。1　发病情况该场共饲养瘦肉型良种母猪 2 92头 ,公猪 5头 ,年可上市肉猪 6 0 0 0多头。母…     

Genetic parameters for reproduction and production traits of Landrace sows in Thailand

Data from Thai Landrace sows were used to estimate genetic parameters for reproduction and production traits in first and later parities. The reproduction traits investigated were total number of piglets born per litter (TB), number of stillborn piglets (SB), and number of piglets born alive but dead within 24 h (BAD). The reproduction data pertained to 12,603 litters born between 1993 and 2005. The production measures were ADG and backfat thickness (BF); these were recorded in 4,163 boars and 15,171 gilts. Analyses were carried out with a multivariate animal model using average information REML procedures. Heritability estimates of reproduction traits for first parity were 0.03 +/- 0.02 for TB, 0.04 +/- 0.02 for SB, and 0.06 +/- 0.02 for BAD. For later parities, they were 0.07 +/- 0.01 for TB, 0.03 +/- 0.04 for SB, and 0.02 +/- 0.01 for BAD. Heritability estimates for production traits were 0.38 +/- 0.02 for ADG and 0.61 +/- 0.02 for BF. Genetic correlations between ADG and TB tended to be favorable, and genetic correlations between BF and TB tended to be unfavorable in all parities. However, BF was genetically correlated unfavorably with SB in later parities, and the genetic correlations between TB and BAD tended to be unfavorable in all parities. The genetic correlations of TB, SB, and BAD between first and later parities were 0.85 +/- 0.13, 0.79 +/- 0.16, and 0.71 +/- 0.24, respectively. Selection for high growth rate will probably increase TB, and selection for low BF will decrease TB and increase SB. The results obtained also indicated that BAD will increase if there is selection pressure for high TB.     

Experimental reproduction of swine infertility and respiratory syndrome in pregnant sows.

The purpose of this study was to experimentally reproduce swine infertility and respiratory syndrome (SIRS). Six multiparous sows were intranasally inoculated at 93 days of gestation with lung homogenates from clinically affected pigs, and 3 additional sows were similarly inoculated with a virus isolated in cell culture from the lung homogenate (SIRS virus, isolate ATCC VR-2332). Inoculated sows developed transient anorexia, farrowed up to 7 days prematurely, and delivered a mean of 5.8 live pigs and 6.0 dead fetuses/litter. Clinical signs of disease were not observed in 3 sham-inoculated control sows that delivered a mean of 12.7 live pigs and 0.3 stillborn fetuses/litter. The SIRS virus was isolated from 50 of 76 live-born and stillborn fetuses from the 9 infected litters. Virus was not isolated from 26 autolyzed fetuses or 15 control pigs. Six of 9 inoculated sows developed neutralizing antibodies to SIRS virus. The reproductive effects found in these experiments were identical to those found in field cases. On the basis of our findings, virus isolate ATCC VR-2332 causes the reproductive failure associated with SIRS.     

配种前营养水平对母猪繁殖性能的影响

提高母猪繁殖性能可带来巨大的经济效益。母猪的繁殖性能与卵泡发育相关。配种前营养水平对母猪繁殖性能有重要的影响。文章综述配种前营养水平对后备母猪和哺乳母猪与卵泡发育相关的繁殖性能的影响。     

复合植物提取物对妊娠母猪繁殖性能的影响

为研究复合植物提取物对妊娠母猪繁殖性能的影响,试验选取40头妊娠85 d大长二元母猪,随机分为对照组、植物提取物组(1000 mg/kg),每头猪为一个重复,试验期为妊娠85 d至分娩。结果表明:植物提取物组仔猪初生重较对照组提高7.6%(P<0.05),并且植物提取物组高初生重仔猪的比例增加(P<0.01),低初生重仔猪的比例减少(P<0.05)。综上,复合植物提取物可提高仔猪初生重,改善仔猪均匀度,提高母猪的繁殖性能。     

调整妊娠母猪预混料营养组成对繁殖机能的影响

本试验通过调整了妊娠母猪预混料的营养组成,考察该预混料对妊娠母猪繁殖机能的影响。1材料与方法1.1试验动物及分组在安徽省合肥市郊区种猪场选取健康、胎次相近(5～7胎)、体重相差不大(170～205kg)的母猪160头(其中长白猪84头、大白猪60头、杜洛克猪16头)。将母猪分成8个批次投入试验,每个批次20头,按品种、胎次、体重等参数配对分成对照与试验两组,每组猪为10头。饲养试验每个批次从母猪发情配种日至仔猪28日龄断奶时结束。1.2饲粮组成对照组母猪1%预混料按我国现行饲养标准配制,试验组在对照组1%预混料基础上调整了维生素E、维生素B2、…     

Genetic parameters and trends for production and reproduction traits in Thai Landrace sows

Data from Thai Landrace sows were used to estimate the genetic parameters and trends for production and reproduction traits, over the first four parities. The reproduction traits investigated were age at first conception (AFC), total number of piglets born per litter (TB) and weaning to first service interval (WSI). The reproduction data was gathered from 9194 litters born between 1993 and 2005. The production measures were average daily gain (ADG) and backfat thickness (BF). These were recorded from 4163 boars and 15 171 gilts. Analyses were carried out using a multivariate animal model inputting average information restricted maximum likelihood procedures. Heritability estimates on the reproduction traits for AFC was 0.21, for TB in the first four parities it ranged from 0.02 to 0.11 and for WSI over the first three parities it ranged from 0.16 to 0.18. Heritability estimates for production traits were: 0.31 (ADG) and 0.45 (BF). AFC was genetically correlated favorably with TB (− 0.48) and WSI (0.35) in the first parity. Genetic trends were 4.71 g, − 0.23 mm and 0.23 days per year for ADG, BF and AFC respectively. There was no genetic progress for the other traits. It was concluded that selection for low AFC will increase TB and decrease WSI. The results further revealed that the ongoing selection being used improved growth rate and reduced backfat thickness. However, there was no genetic improvement in TB.