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1.
伪狂犬病病毒野毒感染猪场的gE抗体阳性头胎母猪生产成绩调查 总被引：1，自引：1，他引：0
伪狂犬病（Pseudorabies，PR）是由伪狂犬病病毒（Pseudorabies virus，PRV）感染多种野生动物及家畜引起的急性、热性的高度接触性传染病。为掌握PRV隐性感染对头胎母猪生产成绩的影响，本研究跟踪调查某一PRV野毒阳性稳定万头母猪场中野毒gE抗体阴性和阳性的头胎母猪总产仔数、健仔数、弱仔数、死胎数、木乃伊胎数、仔猪初生窝重以及断奶活仔数、断奶合格仔数、仔猪断奶重等不同生产成绩指标，探索相同饲养条件下伪狂犬病对头胎母猪各生产指标的影响。结果发现，每头PRV野毒gE抗体阴性头胎母猪每窝平均可产11.96头活仔猪，比gE抗体阳性母猪每胎次多产活仔0.63头，以及每胎次可多提供0.18头断奶活仔，每胎次多提供0.28头断奶合格仔。虽然PRV野毒gE抗体阳性母猪所产仔猪初生均重及断奶均重均高于gE抗体阴性母猪所产仔猪，但gE抗体阴性母猪所产仔猪断奶合格率高于gE抗体阳性母猪，表明其断奶活仔整齐度更高。综上，PRV野毒gE抗体阳性的头胎母猪生产成绩低于gE抗体阴性母猪，伪狂犬病的净化可为猪场带来更高的经济效益，表明伪狂犬病的净化至关重要。 相似文献
2.
Jintao Wang Huansheng Han Wanning Liu Shinian Li Donghua Guo 《Journal of veterinary science (Suw?n-si, Korea)》2021,22(2)
BackgroundPseudorabies (PR), caused by the pseudorabies virus (PRV), is an endemic disease in some regions of China. Although there are many reports on epidemiological investigations into pseudorabies, information on PRV gI antibody dynamics in one pig farm is sparse.ObjectivesTo diagnose PR and analyze the course of PR eradication in one pig farm.MethodsTen brains and 1,513 serum samples from different groups of pigs in a pig farm were collected to detect PRV gE gene and PRV gI antibody presence using real-time polymerase chain reaction and enzyme-linked immunosorbent assay, respectively.ResultsThe July 2015 results indicated that almost all brain samples were PRV gE gene positive, but PRV gI antibody results in the serum samples of the same piglets were all negative. In the boar herd, from October 2015 to July 2018 three positive individuals were culled in October 2015, and the negative status of the remaining boars was maintained in the following tests. In the sow herd, the PRV gI antibody positive rate was always more than 70% from October 2015 to October 2017; however, it decreased to 27% in January 2018 but increased to 40% and 52% in April and July 2018, respectively. The PRV gI antibody positive rate in 100-day pigs markedly decreased in October 2016 and was maintained at less than 30% in the following tests. For 150-day pigs, the PRV gI antibody positive rate decreased notably to 10% in April 2017 and maintained a negative status from July 2017. The positive trend of PRV gI antibody with an increase in pig age remarkably decreased in three tests in 2018.ConclusionsThe results indicate that serological testing is not sensitive in the early stage of a PRV infection and that gilt introduction is a risk factor for a PRV-negative pig farm. The data on PRV gI antibody dynamics can provide reference information for pig farms wanting to eradicate PR. 相似文献
3.
HUANG Yuan CHEN Jing ZHAO Cui-ling CHEN Jin-liang XIANG Rong WANG Xiao-hu XIANG Hua HUANG Zhong 《中国畜牧兽医》2016,43(9):2461-2467
Due to variant strain,pseudorabies virus (PRV) has broken out again and spread in China since 2011.A swine farm in Guangdong province was found pseudorabies (PR) symptoms-like miscarriage after introduction.The study was carried out to identify and control the PR.Serum of sows with and without miscarriage were randomly collected and the PRV gB and gE were detected by ELISA method,and brain tissues of sick piglets were sampled and the PRV gH gene was tested by PCR.All the sows in the farm were emergently inoculated PRV variant strainin activated vaccine.Serum before and after immunization were collected and detected by ELISA and micro-serum neutralization test.ELISA results showed that gE antibody of all the breeding sows with miscarriage were positive,and that of sows without miscarriage showed weekly positive;The average gB ELISA S/P value of sows with miscarriage was as high as 4.0,while that of sows without miscarriage was over 3.0.PCR of 3 sick piglets were all positive and the sequence of gB gene was 100% identical to BJ-YT-2012,a wide variant stain in 2012. The result of detection of the sows serum at before and after immunization showed that the S/P value of gB rose up from 1.603 before immunization to 2.88 at four weeks after immunization,and the neutralizing antibody rose up from 1:24 to 1:213.This agreed with the results that the sows showed less probability of miscarriage since the first week after immunization and almost no miscarriage after two weeks after immunization.This study suggested that classical PRV vaccine was not effective in this case,while the vaccine made from the variant PRV strain was. 相似文献
4.
2011年以来伪狂犬病病毒（PRV）变异株在中国大范围流行致伪狂犬病（PR）再次暴发。广东某猪场发生疑似PR引起母猪较大范围的流产,为此本试验展开对该病诊断和防控方法的研究。随机抽取流产和未流产母猪血清,应用ELISA检测PRV gE和gB抗体;同时采集发病仔猪脑组织PCR检测PRV gH片段。对全场母猪紧急接种PRV变异株灭活苗,分别应用ELISA和中和试验检测免疫前后的血清抗体。结果显示,已发生流产母猪血清PR gE抗体均为阳性,而未流产母猪血清抗体见弱阳性;流产母猪PRV gB抗体的S/P值高达4.0,未流产母猪也达3.3。PCR检测3头病仔的脑组织均为阳性,测序表明其gB基因与2012年流行毒株BJ-YT-2012序列相似性为100%。ELISA检测免疫灭活疫苗前母猪血清PRV gB抗体S/P值为1.603,免疫4周后升高到2.88;特别是中和抗体从1：24升高到1：213。这与免疫疫苗1周后母猪流产开始减少,2周后母猪少见流产的结果吻合。研究结果提示,PRV经典株疫苗产生的PRV gB抗体对变异株的保护作用不佳,而变异株疫苗的保护效果显著。 相似文献
5.
Steffen Hoy Jrg Bauer Catrin Borberg Leonie Chonsch Carmen Weirich 《Livestock Science》2009,126(1-3):69-72
The investigations were carried out with 484 sows from two farms (farm A: housing the sows in small groups of 8 animals each, farm B with a large group of 100 sows) and a total number of 982 inseminations. The number of agonistic interactions was registered for each sow during 48 h after mixing soon after weaning the piglets at farm A. The individual rank place in the social hierarchy was calculated on the basis of wins and defeats and the sows were divided in high and low ranking sows. At farm B the rank position was estimated on the basis of the daily feeding order at two electronic feeding stations (first half of the sows in the feeding order = high ranking, second half = low ranking). Additionally, the following parameters were recorded for each sow: parity, genotype, farrowing rate and litter size (total and alive born piglets). The analysis showed that sows with a high rank position had a significantly higher farrowing rate (88.8%) compared to group-mates with low rank places (82.8%, p = 0.051) (farm A). Sows with a high rank position reached a significantly higher litter size of total born piglets (12.66, 16.14 piglets per litter respectively) than the low-ranking group-mates (12.13, 14.83 piglets/litter respectively — farms A and B). When mixing sows, the time and the conditions (e.g. group size, space allowance per sow) have to be considered to prevent the negative influence of low rank order on fertility. 相似文献
6.
河南平顶山某猪场母猪出现较严重的流产和产死胎现象,且50日龄~70日龄仔猪出现神经症状,根据临床表现初步诊断为伪狂犬病。为排除猪繁殖与呼吸综合征和猪瘟,进行了实验室诊断。应用ELISA方法检测发病保育猪及母猪血清的伪狂犬病病毒野毒株gE抗体,并对发病仔猪病料进行了伪狂犬病病毒(PRV)、猪繁殖与呼吸综合征病毒(PRRSV)和猪瘟病毒(CSFV)的实时荧光定量PCR检测。结果显示,伪狂犬病病毒野毒抗体阳性,实时荧光定量PCR检测确定仔猪病料中PRV核酸阳性,PRRSV和CSFV核酸阴性。结合临床症状及实验室检测,确诊该猪场发生的是猪伪狂犬病。 相似文献
7.
H Van Den Brand LCM Van Enckevort EM Van Der Hoeven B Kemp 《Reproduction in domestic animals》2009,44(6):884-888
Effects of dextrose plus lactose in sow’s feed were tested on subsequent reproductive performance and within litter birth weight variation. During the last week of gestation and lactation, sows were either fed a commercial lactation diet (Control: C), or an isocaloric diet containing 25 g/kg dextrose plus 25 g/kg lactose (Treatment: T). In the subsequent weaning‐to‐oestrus interval (WEI), all sows received the same amount of a commercial feed, but T sows were supplemented with 150 g dextrose plus 150 g lactose per day. Weight and backfat changes were recorded as well as litter characteristics during the treatment period and the subsequent parity. No significant effect of treatment was found on the subsequent reproductive performance, including the number of piglets born, although the number of live born piglets was 0.51 larger (p = 0.31) and weight of the live born piglets was 84 g higher in the T sows (p = 0.07) than in the C sows. When sows were categorized in sows with 12 or less and more than 12 total born piglets in the previous litter, treatment of sows with dextrose plus lactose resulted for the group with 12 or less piglets in a strong increase in subsequent total born piglets (13.97), whereas in the untreated sows the subsequent litter size was 11.89. In the group with more than 12 total born piglets, no effect of treatment was found (interaction between previous litter size and treatment p = 0.03). The within litter variation in birth weight in the subsequent litter was numerically lower in the T sows. We concluded that the use of dextrose and lactose during lactation and WEI seems to enhance litter size in sows with low previous litter size and seems to have the potential to reduce the within litter variation in birth weight. 相似文献
8.
为评估猪伪狂犬病病毒（Pseudorabies virus,PRV）灭活疫苗（HN1201-ΔgE株）免疫后对PRV流行毒株和经典毒株的保护效果,本研究对试验猪分别免疫PRV灭活疫苗（HN1201-ΔgE株）和PRV活疫苗（Bartha-K61）,免疫后第0、7、10、14、17、21、24和28天采血测定PRV gB抗体,并分别使用PRV流行毒株HN1201株和经典毒株闽A株测定免疫后第0、7、14、21和28天血清的中和抗体水平,于免疫后第28天分别使用HN1201株和闽A株攻毒并观察,之后测定体温,测定攻毒后第7和14天PRV gE抗体,及攻毒后0~8 d的排毒情况。结果显示,HN1201-ΔgE免疫组较Bartha-K61免疫组gB抗体和中和抗体产生早,且抗体水平较高。两个免疫组试验猪在攻毒后虽然均无明显临床症状,且免疫组织化学检测（IHC）组织中的病毒抗原均为阴性,但HN1201-ΔgE免疫组试验猪脏器未见任何病理损伤,Bartha-K61免疫组试验猪部分脏器具有病理损伤。与未免疫对照组相比,2个免疫组试验猪在HN1201株和闽A株攻毒后,gE抗体转阳时间晚且排毒率低,HN1201-ΔgE免疫组gE抗体水平整体均低于Bartha-K61免疫组,攻毒后排毒检测中,Bartha-K61免疫组于2个毒株攻毒后第3~5天可检测到排毒,而HN1201-ΔgE免疫组全程未检测到排毒。研究结果表明,灭活疫苗（HN1201-ΔgE株）对PRV流行毒株和经典毒株均可提供完全保护。 相似文献
9.
为了比较不同规模猪场不同胎次母猪繁殖力的高低,本研究采集了106家不同规模猪场母猪的详细生产数据。按母猪实际存栏头数将猪场划分为<1 000、1 000~5 000、5 000~10 000和≥10 000头4个规模,分析不同规模猪场母猪1~9胎次活仔率、健仔率、畸形仔率、死胎率、木乃伊率、断奶活仔率及窝均产总仔数、窝均产活仔数、窝均产健仔数、窝均产死胎数、窝均断奶活仔数、窝均出生个体重、窝均出生窝重等相关繁殖指标的差异。结果表明,在胎次相同的情况下,猪场活仔率、健仔率和断奶活仔率随着饲养规模的扩大呈逐渐升高的趋势,而畸形仔率、死胎率和木乃伊率则呈相反趋势。母猪实际存栏头数≥10 000头的猪场1~7胎次（第4胎除外）的活仔率、健仔率和断奶活仔率均显著高于<1 000头猪场（P<0.05）,而与其他两个规模猪场差异不显著（P>0.05）。母猪存栏数<1 000头的猪场1、2、3、5、7胎次的死胎率显著高于其他3个规模猪场（P<0.05）。各个胎次的窝均产总仔数、产活仔数、产健仔数、畸形仔数、死胎数、木乃伊数、出生窝重都随着猪场饲养规模的扩大呈逐渐降低的趋势。<1 000头的猪场第2、3胎的母猪窝均产总仔数、产活仔数、产死胎数、窝均断奶活仔数、窝均出生窝重均显著高于其他3个规模猪场（P<0.05）。综上,养殖规模对不同胎次母猪生产力均产生较大影响,中大规模猪场（≥1 000头）的母猪繁殖力整体上低于小规模猪场（<1 000头）,但仔猪的体况和成活率要优于小规模猪场。 相似文献
10.
为了解猪伪狂犬病病毒(Pseudorabies virus,PRV)野毒株的特点,本研究对沈阳某养殖场疑似感染PRV的组织病料进行PCR鉴定、病毒分离和纯化、gD、gE基因序列测定及分析、动物回归实验。结果显示：分离株能在ST细胞中产生典型的细胞病变,且PCR显示为PRV阳性;通过gD、gE基因进行序列分析发现,分离株与2011年后分离的PRV变异株位于同一进化分支;氨基酸位点分析发现分离株与PRV变异株具有相同的变异模式。进一步研究其致病性,将纯化后的病毒液接种PRV抗体阴性21日龄健康仔猪,感染仔猪出现典型的PR症状,如呼吸困难、转圈、流涎和划水动作,且在试验期内仔猪全部发病(5/5),其中4头死亡(4/5)。综上,本研究成功分离到一株PRV变异株,将其命名为HP-SY2022。这一研究为丰富我国PRV分子流行病学及后续的免疫防控提供了参考。 相似文献
11.
Calsamiglia M Fraile L Espinal A Cuxart A Seminati C Martín M Mateu E Domingo M Segalés J 《Research in veterinary science》2007,82(3):299-304
Previous studies have described a "litter effect" associated with mortality in postweaning multisystemic wasting syndrome (PMWS) affected farms. The main objective of this study was to evaluate litter mortality in different PMWS affected farms and to characterize it in relation to three variables of the sow: parity, porcine circovirus type 2 (PCV2) infectious status and PCV2 antibody titres. The study was performed in seven farms that experienced PMWS in nurseries and/or fattening areas. Fifteen sows from each farm were randomly selected from the same farrowing batch. Serum samples were analyzed for antibodies to PCV2 and for genomic detection of PCV2. Four piglets from each sow (60 piglets per farm) were selected and ear-tagged at birth. Out of 420 initial piglets, 104 (25%) died. Sixty three of them (60%) were necropsied, and 40 (63%) diagnosed as PMWS based on case definition criteria. Our results show that sow PCV2 viremia was significantly related to piglet mortality since more piglets per litter died from viremic than from non-viremic sows. Additionally, a significantly greater proportion of animals died from sows that had low antibody titres against PCV2 (39% vs. 18% from sows with medium to high antibody titres). The present study, of exploratory nature, confirms previous results and further characterizes the so called "litter effect" by establishing that the sow PCV2 status had a significant effect on litter mortality in PMWS affected farms. 相似文献
12.
P Cowen S Li J S Guy G A Erickson D Blanchard 《American journal of veterinary research》1990,51(3):354-358
Pseudorabies virus (PRV) was isolated from 9 of 44 PRV-vaccinated seropositive sows on 5 of 11 farms. Although serum-neutralization antibody titers were 1:16 to 1:256, 28 virus isolates were obtained from tonsil, nasal, or buccal swab samples from 9 sows given 2 ml of dexamethasone/kg of body weight IM for 5 days. Pseudorabies virus was isolated from 6 of 20 sows (3 of 5 farms) given a killed-virus vaccination. Virus was obtained from 3 of 24 sows (2 of 6 farms) given modified-live virus and killed-virus vaccination. Evaluation of the 9 PRV with 5 restriction endonucleases revealed 4 PRV existing genotypes. The 9 isolated types of PRV appeared to be indistinguishable by Kpn I and BamHI restriction endonuclease analysis; however, when analyzed with Sal I, HinfI, and Pst I, isolates 7 (farm D), 8 (farm C), and 9 (farm B) had numerous differences. Isolates 1, 2, 3, and 4 (farm F) and 5 and 6 (farm G) appeared to be the same genotype when further analyzed with Pst I, HinfI, and Sal I. 相似文献
13.
To determine the effect of within-litter neonatal-weight variation on pre-weaning mortality and weight gain, we analyzed piglet survival and weight gain within 400 litters from 10 commercial farms. Neonatal-weight variation (independent of mean neonatal weight, litter size and sow parity) was associated with pre-weaning survival and weaning-weight variation-but not with mean weaning weight. Neonatal piglets with weights well below the range of most of the litter (low-birth-weight piglets) had an increased risk of dying and were unable to obtain normal weight gains by weaning if they survived. These piglets experienced lower survival and poorer weight gain in larger litters. These piglets also tended to have lower survival but normal (albeit low) weaning weights if they survived in litters from middle-aged and old sows. High neonatal-weight variation resulted in lower survival and more variable weaning weights. Small piglets had a greater risk for poor survival and weight gain compared to their heavier litter-mates (a disadvantage that was exacerbated in large litters). 相似文献
14.
母猪产死胎、弱胎和断奶仔猪腹泻是兽医临床养猪业亟待解决的问题。为了响应国家在养殖业中执行的“减抗替抗”政策,本文基于中医辩证论治,探讨中草药复方芪英汤、子甘汤分别对母猪繁殖性能和断奶仔猪生长性能的影响。对同期发情的母猪(35头)和同期断奶仔猪(140头)进行中药方剂预混饲料的饲养方式,分别持续饲养至分娩结束、30 d,同时记录母猪分娩数据包括窝均出生仔猪数、窝均重、窝均死胎数、死胎率等,仔猪生长数据包括初重、末重、料肉比和腹泻率,通过酶联免疫吸附方法(ELISA)、荧光定量PCR(RT-PCR)检测母猪血清中IL-6、IL-1β、TNF-α、IgG、IgA、IgM和断奶仔猪血清中IgA的分泌情况以及母猪圆环病毒2型、伪狂犬病病毒、猪繁殖与呼吸综合征病毒及抗体来确定母猪免疫力情况。结果表明,芪英汤可以显著降低妊娠母猪炎性因子IL-6、TNF-α分泌水平,降低低胎次母猪生产新生仔猪死胎率、弱胎率、死亡率,分别下降1.96%、5.83%、8.25%,提高母猪的繁殖性能。子甘汤和芪英汤联用能够显著提高仔猪断奶后期IgA水平,降低腹泻率和料肉比, 提高生长性能,降低断奶仔猪血液中白细胞水平,红细胞恢复到正常水平。综上,中药复方芪英汤和子甘汤有助于提高母猪繁殖性能和恢复断奶仔猪生长性能。 相似文献
15.
本文系对103头360窝太湖猪的繁殖性能进行系统研究。结果是60头母猪在6个繁殖周期中共繁殖360窝,平均繁殖周期158.33天,年产仔2.31胎。窝产仔16.35头,活仔15.10头,35日龄断奶育成14.44头,窝重83.48公斤。每头母猪年产仔37.69头,年产活仔34.81头,年提供断奶仔猪33.29头。其中窝产仔达到18头以上,出现1胎或连续4胎高产的母猪69头,占试验母猪群66.99％。 相似文献
16.
An investigation of the effects of level of nutrition, both in lactation and from weaning to remating, on subsequent litter size and associated reproductive characteristics in the early-weaned sow is reported. Subjects were 75 sows in 5 groups. In 4 of the groups the sows were weaned after a 10-day lactation period. Group 5 was weaned following a 42-day gestation. The control group was fed up to 6.3 kg/day during lactation and 2.7 kg/day from weaning to remating. The 4 early-weaned groups were each fed differently. In lactation and during the inverval from weaning to remating they were fed either 2 or 4 kg/day. The group receiving only 2 kg/day during each period lost more weight than the others (p less than .05). Weight loss in lactation was significantly (p less than .001) affected by feeding. Sows weaned after a 10-day lactation period farrowed 2.7 piglets/litter less in the next parity than sows weaned after a 6-week lactation period. Weight losses during lactation were not related to subsequent litter size. Level of nutrition from weaning to remating in these tests had no influence on subsequent litter size. The early-weaned sow, even with large fluctuations in weight change over the period from parturition to remating, did not alter their ceiling for litter size. It seems unlikely that ovulation rate is the major factor limiting litter size in the early-weaned sow. Results suggest that embryo mortality following ovulation and coitus is increased in the early-weaned sow and that this effect then manifests itself as a ceiling to subsequent litter size. 相似文献
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为观察复方中草药制剂对母猪分娩和泌乳效果的影响,试验选择妊娠80-90 d的68头妊娠母猪,按配种日龄、胎次、体况、品种随机均分为中草药制剂组和对照组,每组34头,每头母猪为1个重复。两组基础饲粮相同,中草药制剂组在基础饲粮中按每吨300 g添加中草药制剂,试验期为妊娠80 d至断奶。结果表明,与对照组相比,中草药制剂组窝均产活仔数和断奶窝均仔猪数分别提高0.93头（P＜0.05）和1.09头（P＜0.01）;产活仔率和健仔率分别提高5.91和4.52个百分点;仔猪初生个体均重、断奶个体均重、仔猪平均日增重分别提高0.05 kg、0.5 kg、22.6 g,差异均显著（P＜0.05）。中草药制剂可有效提高母猪分娩质量和泌乳水平。 相似文献
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When sows and their litters are kept outdoors, much of the responsibility for the litter is shifted from the herdsman to the sow compared to when the sows are kept indoors. Therefore, the maternal ability, including maternal behaviour, is believed to be important in outdoor piglet production. The aim of this study was to describe maternal traits in conventionally bred first-parity sows kept outdoors. Nursing behaviour, sow activity, sow body reserves, litter size and piglet growth were studied in 40 first-parity sows during a seven week long lactation. The sows were kept in groups outdoors. Sow activity (lying down or active) and nursing behaviour (nursing frequency, nursing duration and nursing terminator) were recorded on videotapes at four days post partum (pp) and directly observed at four and six weeks pp. Cross suckling was observed at four and six weeks pp. Sows were weighed and measured for backfat depth five days before farrowing, two weeks pp and at weaning seven weeks pp. Piglets were weighed at four days pp, at two weeks pp and at weaning. We concluded that sow nursing behaviour and activity are individual characteristics repeatable within sows' late lactation. Less active sows are more available for suckling. Light and thin sows have an earlier and more progressed weaning process than heavier, fatter sows. A significant positive relation was found between sow appetite in early lactation and piglet growth until weaning. Sow nursing behaviour is not important for piglet growth when sows and piglets are held in groups, piglets have access to sow feed and piglets are weaned as late as at seven weeks of age. 相似文献
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Wei Yao Hongliang Zhao Jie Li Zhijun Wang Yuhuang Han Shuren Dong Yuejiang Wang Fenglai Wang 《畜牧与生物技术杂志(英文版)》2011,2(3):141-152
This experiment was conducted to investigate the effects of different ratios of n-6:n-3 polyunsaturated fatty acids (PUFA) in sow diets on the performance of lactating sows and their piglets at low digestible energy intakes.Twenty-one pregnant Landrace sows were assigned to one of three diets from day 108 of gestation until weaning (26 to 29 d),containing n-6∶n-3 PUFA ratios of 3∶1,8∶1 and 11∶1.The effects on sow and litter production traits and on sow body condition were examined.There were no differences among treatments in daily feed intakes or in changes in sow weight and back-fat levels during lactation.Litter size,litter weight at birth and weaning and litter average daily weight gain were also unaffected by treatment.As expected,large differences were observed in n-6 and n-3 fatty acids in the colostrum and plasma of sows and piglets (P ＜ 0.01 ).The ratio of n-6∶n-3 PUFA the diet was positively correlated with those in colostrum,sow plasma and piglet plasma ( R2 =0.55,0.80 and 0.80,respectively).Sow plasma insulin and IGF-I levels at weaning were unaffected by the treatments.Plasma leptin ( P ＜ 0.05) concentrations were increased in sows fed the diet with a n-6∶ n-3 ratio of 8∶1.Immunoglobulin concentrations in colostrum were not altered by dietary treatment.Plasma IgG concentrations at d 14 were highest in piglets from sows fed the 8∶1 ratio of n-6∶n-3.Furthermore,this group had the highest IgA concentrations at day 21 of lactation compared with the other two groups ( P ＜ 0.05 ).In summary,our study demonstrated that at low digestible energy levels,altering the ratio of n-6∶n-3 PUFA in the diets for lactating sows affected immune components and the fatty acid composition of lactating sows and their piglets.Further studies are needed to examine whether higher levels of fat supplementation than those used in the present study ( 1.5％ ) can successfully enhance performance. 相似文献