Functional amino acid supplementation,regardless of dietary protein content,improves growth performance and immune status of weaned pigs challenged with Salmonella Typhimurium

High dietary protein may increase susceptibility of weaned pigs to enteric pathogens. Dietary supplementation with functional amino acids (FAA) may improve growth performance of pigs during disease challenge. The objective of this study was to evaluate the interactive effects of dietary protein content and FAA supplementation above requirements for growth on performance and immune response of weaned pigs challenged with Salmonella. Sixty-four mixed-sex weanling pigs (13.9 ± 0.82 kg) were randomly assigned to dietary treatments in a 2 × 2 factorial arrangement with low (LP) or high protein (HP) content and basal (AA–) or FAA profile (AA+; Thr, Met, and Trp at 120% of requirements) as factors. After a 7-d adaptation period, pigs were inoculated with either a sterile saline solution (CT) or saline solution containing Salmonella Typhimurium (ST; 3.3 × 10⁹ CFU/mL). Growth performance, body temperature, fecal score, acute-phase proteins, oxidant/antioxidant balance, ST shedding score in feces and intestinal colonization, fecal and digesta myeloperoxidase (MPO), and plasma urea nitrogen (PUN) were measured pre- and postinoculation. There were no dietary effects on any measures pre-inoculation or post-CT inoculation (P > 0.05). Inoculation with ST increased body temperature and fecal score (P < 0.05), serum haptoglobin, plasma superoxide dismutase (SOD), malondialdehyde (MDA), PUN, and fecal MPO, and decreased serum albumin and plasma reduced glutathione (GSH):oxidized glutathione (GSSG) compared with CT pigs (P < 0.05). ST-inoculation reduced average daily gain (ADG) and feed intake (ADFI) vs. CT pigs (P < 0.05) but was increased by AA+ vs. AA– in ST pigs (P < 0.05). Serum albumin and GSH:GSSG were increased while haptoglobin and SOD were decreased in ST-inoculated pigs fed AA+ vs. AA– (P < 0.05). PUN was higher in HP vs. LP-fed pigs postinoculation (P < 0.05). Fecal ST score was increased in ST-inoculated pigs on days 1 and 2 postinoculation and declined by day 6 (P < 0.05) in all pigs while the overall score was reduced in AA+ vs. AA– pigs (P < 0.05). Cecal digesta ST score was higher in HP vs. LP-fed pigs and were lower in AA+ compared with AA– fed pigs in the colon (P < 0.05). Fecal and digesta MPO were reduced in ST pigs fed AA+ vs. AA– (P < 0.05). These results demonstrate a positive effect of FAA supplementation, with minimal effects of dietary protein, on performance and immune status in weaned pigs challenged with Salmonella.     

The effect of fermented persimmon shell diet supplementation on the growth performance and blood parameters in finishing pigs

The objective of the present study was to investigate the effects of fermented persimmon shell diet (FPSD) supplementation on growth performance and blood parameters in 96 Berkshire pigs. The FPSD was made from persimmon shell and mixed with rice bran and barley bran. Samples of FPSD on day 0 (D0) and day 60 (D60) were analyzed for chemical composition, pH and organic acids. The experimental diets were 0, 3, 5 and 7% FPSD added to C, T1, T2 and T3 of finishing diets on fresh matter basis. Dry matter (DM) was lower (P < 0.01) and crude protein was higher (P < 0.01) on D60 than on D0. pH value decreased (P < 0.01) on D60 than on D0 but organic acids were increased (P < 0.01). Average daily gain was higher (P < 0.05) in T2 than in other groups. Average daily feed intake was higher (P < 0.05) in T2 than in other groups. Total cholesterol was higher (P < 0.05) in T3 than in other groups. High‐density lipoprotein cholesterol increased (P < 0.05) in groups by the addition of FPSD. Blood urea nitrogen was lower (P < 0.05) in C than in other groups. The results indicate that FPSD improved the growth performance and blood parameters in Berkshire pigs.     

Effect of dietary excess of branched‐chain amino acids on performance and serum concentrations of amino acids in growing pigs

Depressed performance and availability of some amino acids (AA) in pigs fed excess Leu diets appear to be related to lower feed intake. Surplus Ile and Val may help to overcome this effect. An experiment was conducted with 24 pigs (31.8 ± 1.2 kg initial BW) to evaluate the effect of dietary excess of either Leu alone or with surplus Ile and Val on performance and serum concentration (SC) of essential AA. Treatments were as follows: T1, basal diet; T2, basal plus 0.43% L‐Leu (excess Leu); T3, basal added with 0.43% L‐Leu, plus 0.20% L‐Ile and 0.25% L‐Val (excess LIV). The basal diet was formulated to contain 0.90% standardized ileal digestible Lys and added with crystalline L‐Lys, L‐Thr, DL‐Met, L‐Trp, L‐Leu, L‐Ile, L‐His and L‐Val to create essential AA:Lys ratios close to an ideal protein for growing pigs. All pigs were fed the same amount of feed twice a day (average, 3.42× the requirement of NEm). Blood samples were collected at 2.5 (absorptive) and 11.0 h (post‐absorptive) post‐prandial to analyse SC of AA. Excess of either Leu or LIV did not affect growth rate nor feed conversion. Excess Leu increased Leu SC and decreased Ile and Val SC (p < 0.05) at both absorptive and post‐absorptive phases, but excess LIV restored the SC of Ile and Val. The SC of other essential AA was not affected by excess of either Leu or LIV. The SC of all AA during absorptive, on average, was about two times higher than that of post‐absorptive phase. These results suggest that the reduced availability (SC) of Ile and Val in pigs consuming excess Leu diets is attributed to a reduced absorption and increased cellular degradation rates of them.     

酵母培养物降低黄曲霉毒素和呕吐毒素对猪生长性能、器官健康和免疫状态影响的研究

文章旨在评估酵母培养物对饲喂毒素污染日粮断奶猪生长性能、器官健康和免疫状态的影响。试验选择体重为(8.75±0.38)kg,28 d断奶的三元杂交猪500头,随机分为5组,每组5个重复(20头/重复),试验共开展42 d。对照组为未加毒素污染原料,处理1组含150μg/kg黄曲霉B1毒素+1100μg/kg呕吐毒素,处理2组在处理1组中添加2 mg/kg蒙脱石,处理3组在处理1组中添加1.0 mg/kg蒙脱石和0.5 mg/kg酵母培养物复合物,处理4组在处理1组中添加0.5 mg/kg蒙脱石和0.5 mg/kg酵母培养物复合物。结果显示:日粮污染降低了仔猪日增重,通过增加单核细胞和免疫球蛋白来改变免疫系统。霉菌毒素可引起肝、胆管增生和核肿大等组织损伤。毒素污染日粮添加2 mg/kg蒙脱石或1.0 mg/kg蒙脱石和0.5 mg/kg酵母培养物复合物降低了霉菌毒素对免疫系统和肝脏的影响,改善了仔猪生长性能。结论:日粮添加2 mg/kg蒙脱石或1.0 mg/kg蒙脱石和0.5 mg/kg酵母培养物复合物对饲喂毒素污染日粮猪的健康和生长性能具有改善作用。     

Effects of dietary Selenomethionine supplementation on growth performance,antioxidant status,plasma selenium concentration,and immune function in weaning pigs

Background

This study was designed to evaluate the efficacy of DL-selenomethionine (DL-SeMet) supplementation on growth performance, antioxidant status, plasma selenium (Se) concentration, and immune function of weaning pigs. 216 weaning pigs were randomly allocated to 6 treatments with 6 replicates each according to a complete randomized block design. Each replicate had six pigs. Diet of group one was corn-soybean basal diet without any additional Se supplement. Group 2 was supplemented with 0.3 mg/kg of Se from sodium selenite. Groups 3-6 were supplemented with 0.1, 0.3, 0.5, and 0.7 mg/kg of Se from DL-SeMet, respectively. The trial lasted for 42 days.

Results

Pigs supplemented with 0.3 and 0.7 mg/kg DL-SeMet obtained better feed gain ratio (P < 0.05). The best antioxidant ability (serum, liver, and muscle) was shown in 0.1-0.3 mg/kg DL-SeMet groups (P < 0.05). The plasma Se concentration increased as the dietary DL-SeMet level elevated. The immunity among groups was not affected.

Conclusions

DL-SeMet supplementation in the diet significantly improved the growth performance, antioxidant ability and plasma Se content of weaning pigs. DL-SeMet can replace sodium selenite in the diet of weaning pigs.     

Effects of different dietary sources and levels of selenium supplements on growth performance,antioxidant status and immune parameters in Ross 308 broiler chickens

1. Although different impacts of various sources of selenium (Se) on chicken performance have been largely studied, there is a lack of comparative experiments studying the effects of these sources on the immune system and antioxidant indices of broiler tissues. The aim of this study was to examine the effects of various sources and levels of dietary Se supplements on performance, antioxidant status and immune parameters in Ross 308 broiler chickens.

2. A total of 1200 1-d-old male broilers (Ross × Ross 308) were divided into 8 treatments with 6 replicate pens and 25 birds per pen. This experiment was conducted as a completely randomised design with a 4 × 2 factorial arrangement. Main factors included Se sources as sodium selenite (SS), Se-enriched yeast (SY), DL-selenomethionine (SM) and nano-selenium (NS) and levels at 0.1 or 0.4 mg/kg Se.

3. Dietary supplementation of organic Se sources significantly improved average daily gain (ADG), gain: feed ratio and European production efficiency factor (P < 0.05) compared to birds fed on diets supplemented with inorganic source. In addition, ADG was increased in response to increased level of supplemental Se. Based on contrast comparison, there were significant differences in these parameters between organic versus inorganic sources of Se. However, there was no difference between contrast comparisons of NS versus SM and SY.

4. Total anti-sheep red blood cell (SRBC) and Immunoglobulin G (IgG) titres and hypersensitivity were enhanced by increasing supplemental concentration of Se and using organic sources of Se rather than SS (P < 0.05).

5. Oxidation resistance assessment of tissues demonstrated that supplementation of organic sources of Se and increase in supplemental concentration of Se ameliorated glutathione peroxidase activity, total antioxidant capacity and malondialdehyde formation (P < 0.05). Mostly, there were significant differences between organic versus inorganic sources of Se in oxidation resistance.

6. Overall, dietary supplementation of 0.4 mg/kg Se from an organic source resulted in better production performance and immune system response. Moreover, minimum formation of malondialdehyde in broiler tissue was observed in birds fed on diets supplemented with SM at 0.4 mg/kg.

7. It can be concluded that SM is more effective than other sources of Se in reducing lipid oxidation.     

SSTR和IGFBP对生长猪生产性能的影响

选用 9周龄 1 9kg左右约·杜·长·宁四元杂种猪 60头 ,随机分为 3组 ,试验组I、试验组II和对照组各 2 0头。试验组I在 1 0、 1 3和 1 5周龄颈部皮下注射生长激素抑制激素受体 (SSTR)疫苗 ;试验组II在 1 0周龄颈部皮下注射SSTR +IGFBP (胰岛素样生长因子结合蛋白 )疫苗 ,1 3及 1 5周龄注射SSTR疫苗 ;对照组注射相同剂量的生理盐水。结果表明 :SSTR组平均日增重较对照组提高 5 73% ,采食量提高 3 88%。SSTR +IGFBP组平均日增重较对照组提高 9 74% ,采食量提高 1 1 1 6%。     

黄曲霉毒素对猪生长性能及内脏器官的影响

选用60头体质量28 kg左右的杜长大三元杂交猪,随机分为2组,每组3个重复,每个重复10头猪(公母各半),分别饲喂基础日粮(C组)、基础日粮添加0.1 mg/kg黄曲霉毒素(AF组),试验期90 d,研究黄曲霉毒素(AF)对猪生长性能及内脏器官的影响。结果表明:AF显著影响试验猪的生长性能和内脏器官相对重量,与C组相比,AF组试验猪日增重降低了12.90%(P<0.01),料重比提高了7.54%(P<0.01);AF组试验猪肝脏、肾脏、脾脏、胰脏的相对重量分别提高了8.24%(P<0.05)、27.27%(P<0.01)、41.18%(P<0.01)、42.86%(P<0.01);AF组试验猪肝细胞和肾细胞发生了严重的脂肪变性和空泡变性。提示:长期饲喂0.1 mg/kg黄曲霉毒素污染的日粮可诱发猪黄曲霉毒素的慢性中毒。     

Performance,serum amino acid concentrations and expression of selected genes in pair‐fed growing pigs exposed to high ambient temperatures

Heat stress (HS) depresses pig performance mainly because of appetite reduction, although other factors involved in the cellular availability of nutrients may also contribute to that depression. An experiment was conducted with twelve pair‐fed pigs (30.3 ± 2.7 kg BW) to examine the effect of severe HS (up to 45 °C) on the expression of genes coding for two cationic amino acid (AA) transporters (b^0,+AT and CAT‐1), leptin, heat‐shock protein (Hsp‐90) and myosin in several tissues; serum concentrations (SC) of AA; and performance. There were two treatments: Comfort, pigs housed at an average temperature of 22 (±2) °C; and HS, pigs housed in a similar room with no climate control, where temperature was raised up to 45 °C. All pigs received the same wheat–soybean meal diet and had similar daily feed intake. Comfort pigs had a higher daily gain and better gain/feed ratio than HS pigs (p < 0.05). The expression of b^0,+AT in jejunum and liver, that of myosin in the Semitendinosus muscle, and leptin in adipose tissue was lower, but CAT‐1 in jejunum and liver, and Hsp‐90 in liver was higher in HS pigs. The SC of Lys and Met in HS pigs were around 55% and 20%, respectively, of that in Comfort pigs (p < 0.05). In conclusion, HS affects the expression of cationic AA transporters, myosin, Hsp‐90, leptin; the SC of Lys and Met; and the performance of pair‐fed pigs. These results suggest that HS‐related changes in gene expression affect the performance of pigs beyond the effect caused by the reduction in voluntary feed intake.     

Effects of Chinese traditional herbal medicine complex supplementation on the growth performance,immunity and serum traits of pigs

The purpose of this study was to investigate the effects of a traditional Chinese herbal medicine complex supplementation on the growth performance, immunity and serological traits of pigs, and the feasibility of its use as a substitute for antibiotics. Thirty‐six weaned pigs LYD with average initial body weight of 10 ± 0.55 kg were randomly divided into three treatments with three replicates. These constituted the control, the antibiotics group (chlortetracycline 100 µg/kg, oxytetracycline 100 µg/kg), and 0.3% Chinese herbal medicine complex group (CHM). Experiment results indicated that the CHM group exhibited significantly increased average feed intake and peripheral blood CD3⁺CD8⁺ T cell percentage as compared with those of the antibiotics group (P < 0.05). High‐density lipoprotein (HDL) level was greater while low‐density lipoprotein + very low‐density lipoprotein (LDL + VLDL) level was lower in the CHM group than the control group (P < 0.05). The in vitro results indicated that peripheral blood mononuclear cells (PBMC) stimulated by Con‐A produced a greater interleukin (IL)‐6 level in the CHM group and IL‐6 level stimulated by lipopolysaccharide was greater than the antibiotics groups (P < 0.05). Above all, this study has indicated that the addition of Chinese traditional herbal complex to pigs' diets has beneficial results.     

Apparent and standardized ileal digestibility of amino acids in diverse barley cultivars fed to growing pigs

The objectives of this study were to determine the chemical composition, ileal amino acid (AA) digestibility of barley varieties and to develop equations to predict the AA digestibility based on the chemical characteristics of individual barley. A wide selection of nine barley varieties in the main growing regions of China was used in the experiment. Ten crossbred pigs (30.9 ± 1.8 kg) were allotted to a 6 × 10 Youden Square. The treatments included a nitrogen‐free diet and nine barley test diets. Considerable variation was observed in the content of neutral detergent fiber, acid detergent fiber, crude protein (CP) and all AAs among the barley samples. The standardized ileal digestibility (SID) of indispensable AAs with the exception of arginine, phenylalanine and threonine were different (P < 0.05) among the nine barley sources tested. With R² values exceeding 0.50, significant linear regression equations for CP and threonine were obtained. In conclusion, significant differences existed in the ileal digestibility of CP and AAs among barley varieties. It is difficult to predict the SID of most of the amino acids in barely based upon chemical characteristics.     

复方中草药对猪生长性能、屠宰性能、肉品质和免疫功能的影响

试验旨在研究复方中草药对猪生长性能、屠宰性能、肉品质和免疫功能的影响.将60头育肥猪随机分成4组,每组15头猪.对照组、Ⅰ组、Ⅱ组、Ⅲ组分别在基础日粮中添加0、0.5％、1.0％、2.0％的复方中草药.结果显示:与对照组相比,Ⅰ组育肥猪平均日增重、血清免疫球蛋白G(IgG)含量均显著提高(P＜0.05),失水率显著降低...     

饲粮含硫氨基酸水平对断奶仔猪生长性能、肠道形态及酶活性的影响

文章旨在研究饲粮含硫氨基酸水平对断奶仔猪生长性能、肠道形态及酶活性的影响。试验选择体重接近的28日龄断奶仔猪80头,称重后随机分为试验1、2、3、4组,各组饲粮中含硫氨基酸含量分别0.49%、0.64%、0.79%、0.94%,共进行21d。试验结果,仔猪平均日采食量(ADFI)随着饲粮中含硫氨基酸水平增加出现先增加后下降的趋势,料肉比(F/C)与之趋势相反,当含硫氨基酸含量为0.79%时(试验3组)生长性能最好。其中,试验2、3组仔猪平均日增重(ADG)较试验1组分别增加12.5%、15.9%(P<0.05),F/C较试验1组分别降低10.8%、12.4%(P<0.05)。饲粮中含硫氨基酸水平显著影响仔猪空肠形态,而对十二指肠、回肠形态无显著影响(P>0.05)。相比于试验1组,试验2、3、4组空肠绒毛高度(VH)分别增加8.6%、11.7%、9.1%(P<0.05),空肠隐窝深度(CD)分别下降22.6%、16.4%、12.7%(P<0.05),试验2、3组绒毛高度和隐窝深度比(V/C)较试验1组分别增加24.3%、17.4%(P<0.05)。除此之外,饲粮中含硫氨基酸显著影响仔猪空肠中碱性磷酸酶(ALP)活性(二次P<0.05)及麦芽糖酶活性(P<0.05)。综上所述,饲粮中含硫氨基酸水平显著影响断奶仔猪小肠发育及空肠内酶活性,改善生长。     

不同硒源对肝用鹅早期生长性能及免疫功能的影响

为了研究不同硒源对肝用鹅早期生长性能及免疫功能的影响,试验选用1日龄健康、体重相近的肝用鹅96只,按单因素完全随机设计分成4个组,1组为对照组,2组添加亚硒酸钠,3组添加酵母硒,4组添加纳米硒。每组3个重复,每个重复8只,公母各半。在基础日粮一致的情况下,2、3、4组分别添加同水平(0.3mg/kg)的不同硒源。试验期为9周。结果表明:各试验组体增重、采食量和料重比与对照组比较差异不显著(P0.05)。9周龄除亚硒酸钠组脾脏指数与对照组差异不显著外(P0.05),其余各试验组4周龄和9周龄免疫器官指数均显著高于对照组(P0.05),但不同硒源间差异不显著(P0.05)。4周龄和9周龄T淋巴细胞转化率亚硒酸钠组和纳米硒组均显著高于对照组(P0.05),酵母硒组显著高于亚硒酸钠组(P0.05),极显著高于对照组(P0.01)。上述结果表明,各种硒源对鹅生产性能的影响差异不显著,而对于免疫功能的影响,酵母硒优于纳米硒和亚硒酸钠。     

中草药、益生素和抗生素对猪生长性能和免疫功能的影响比较试验

本试验旨在比较中草药、益生素和抗生素对生长猪生产性能和免疫功能的影响。试验选取15kg左右的杜×长×大三元杂交猪90头,随机分为抗生素组、0.2%益生素组和0.2%中草药组,每组3个重复,每个重复10头猪,试验时间28d。结果表明:(1)与抗生素组相比,益生素及中草药组的日增重提高、料重比降低(P>0.05);(2)中草药组的IgG、IgM、IgA、C3、C4含量和益生素组的IgG含量均显著提高(P<0.05)。结论:在生长猪日粮中添加0.2%益生素或中草药能够促进动物生长,提高免疫功能,效果优于抗生素。     

大豆黄酮和半胱胺对生长肥育猪生长性能的影响

本试验研究了半胱胺(CS)和大豆黄酮(Da)对杜×长×大生长肥育猪生长性能和胴体性状的影响,结果表明:这两种物质均具有显著促进猪生长作用,且在猪生长期的促生长效果好于肥育期.二者能提高胴体瘦肉率4%以上,脂肪率下降9%.     

褪黑素对肉鸡生长性能及免疫功能的影响

采用对比试验,将120只1日龄AA肉鸡分为2组(对照组和试验组),每组3个重复,每个重复20只鸡。对照组不添加褪黑素,试验组添加褪黑素10mg/kg,研究褪黑素对肉鸡生长性能及免疫机能的影响。试验结果表明:试验期间,鸡的平均日增重(ADG)、饲料转化率(FCR)差异显著(P<0.05);平均日采食量(ADFI)差异不显著(P>0.05);胸腺、脾脏、法氏囊指数试验组显著高于对照组(P<0.05)。     

黄曲霉毒素对猪生长性能及免疫和抗氧化指标的影响

选用60头体质量28 kg左右的“杜长大”三元杂交猪,随机分为2组,每组3个重复,每个重复10头猪（公母各半）,分别饲喂基础日粮（C组）、基础日粮添加0.1 mg/kg黄曲霉毒素（AF组）,试验期90 d。饲养试验结束时,对猪的生长性能、免疫指标和抗氧化指标进行分析。结果表明：黄曲霉素显著影响试验猪的生长性能,日增重降低12.90%（P〈0.01）,料重比提高7.54%（P〈0.01）,同时显著降低试验猪的免疫功能和抗氧化能力。提示：长期饲喂0.1 mg/kg黄曲霉素可诱发猪黄曲霉毒素慢性中毒。     

添加不同水平植物乳酸杆菌提取物对猪生长性能、免疫机能及经济效益指标的影响

为研究添加不同水平植物乳酸杆菌提取物对猪生长性能、免疫机能及经济效益指标的影响,采用单因素随机设计试验,选择体重相近、健康的育肥猪60头随机分成4组,每组15个重复,每个重复1头,1组为对照组饲喂基础日粮,试验2、3、4组分别添加1.5％、2.0％、2.5％植物乳菌提取物,预试验10 d,试验期为56 d.结果表明:(...     

Effects of bamboo charcoal and bamboo vinegar as antibiotic alternatives on growth performance,immune responses and fecal microflora population in fattening pigs

This study was carried out to investigate the effects of bamboo charcoal and bamboo vinegar as alternatives of antibiotics in the diet of fattening pigs and their influence on growth performance, immune responses and fecal microflora populations. Crossed pigs (n = 144, 79 kg body weight) were divided into 12 heads per pen, four diets and three replications. The basal diet (negative control: NC) was supplemented with 0.3% antibiotics (positive control: PC), 0.3% bamboo charcoal (BC) and 0.3% bamboo vinegar (BV). Average daily weight gain and feed efficiency were higher (P < 0.05) in PC, BC and BV. The concentration of lactate dehydrogenase and cortisol were lower (P < 0.05), but the concentration of immunoglobulin G (IgG) and IgA were higher (P < 0.05) in PC, BC and BV. Counts of coliform bacteria and Salmonella spp. were lower (P < 0.05), while the counts of fecal anaerobic total bacteria and lactic acid bacteria were higher (P < 0.05) in PC, BC and BV. A reasonable inclusion of bamboo charcoal or bamboo vinegar as antibiotics in the diet of fattening pigs leads to a better growth performance, immune responses and fecal microflora populations. The results of the present study suggest that bamboo charcoal or bamboo vinegar could be a potential additives in animal production as an alternative to antibiotics.