This study aimed to examine the effects of activated charcoal-herb extractum complex (CHC) on the growth performance of broilers, inflammatory status, microbiota, and their relationships. A total of 864 1-day-old Arbor Acres male broilers (41.83 ± 0.64 g) were distributed to eight dietary treatments with six replicates (18 birds per replicate), which were a corn-soybean meal-based diet (NCON); basal diets supplemented with 250, 500, 750, or 1,000 mg/kg CHC, and three positive controls; basal diets supplemented with 200 mg/kg antibacterial peptide (AMP), 200 mg/kg calsporin (Probio) or 500 mg/kg montmorillonite. The study period was 42 days including the starter (day 0–21) and grower (day 22–42) phases. Compared with the NCON group, CHC supplementation (optimal dose of 500 mg/kg) increased (p < 0.05) growth performance and tended to increase feed conversion rate in broilers. CHC (optimal dose of 500 mg/kg) decreased the level of the interleukin-1β (IL-1β) and interferon-γ (IFN-γ) in serum and improved the levels of immunoglobulins A (IgA) and immunoglobulins A (IgM) in serum, and secretory immunoglobulin A (SIgA) in the mucosa of duodenum and jejunum (p < 0.05). In the ileum, CHC supplementation decreased community abundance represented by lower Sobs, Chao 1, Ace, and Shannon compared with NCON (p < 0.05). At the phylum level, CHC supplementation increased the abundance of Firmicutes, while decreasing the abundance of Bacteroidetes in ileum and cecum (p < 0.05). At the genus level, compared with the NCON group, CHC markedly reduced (p < 0.05) the abundances of pathogenic bacteria Alistipes in the ileum, which were negatively associated with the levels of SIgA and IL-1β in ileum mucosa. In conclusion, CHC had beneficial effects on growth performance, immune status, and intestinal microbiota composition. CHC had dual functions of absorption like clays and antibacterial like antibacterial peptides.

本试验旨在研究日粮添加不同水平的2种复方中草药添加剂(加曼-100和料磺1号)对肉仔鸡生长性能、屠宰性能、免疫性能和组织病理学的影响,以评价2种复方中草药添加剂的效果和适宜添加量.试验一、二各选用432只1日龄AA肉仔鸡,随机分为4个处理,每个处理6个重复,每个重复18只鸡.试验一中4个处理组分别在基础日粮中添加0(对照组)、500、1000、1500 mg/kg加曼-100;试验二中4个处理组分别在基础日粮中添加0(对照组)、1500、2000、2500 mg/kg料磺1号,试验分前后两期(0～21 d、22～42 d)共42 d.结果表明:试验一中后期及全期时,与对照组相比,日粮添加加曼-100可提高肉仔鸡的平均日增重(P<0.01)并降低耗料增重比(P<0.01);1000 mg/kg加曼-100组提高了肉仔鸡屠宰率、全净膛率、腿肌率(P<0.01)和半净膛率(P<0.05),降低了腹脂率(P<0.01).试验二中,与对照组相比,日粮添加2000 mg/kg料磺1号可提高肉仔鸡后期及全期的平均日增重(P<0.05)并降低全期的耗料增重比(P<0.05);同时提高肉仔鸡屠宰率、半净膛率、全净膛率(P<0.01)和腿肌率(P<0.05).日粮添加加曼-100或料磺1号均提高了肉仔鸡血清免疫球蛋白水平(P<0.01),且各组间免疫器官指数均无显著差异,组织病理观察均无不良影响.综上,2种复方中草药添加剂可提高肉仔鸡生长性能、屠宰性能及免疫性能,加曼-100最适添加量为1000 mg/kg,料磺1号最适添加量为2000 mg/kg.

Objective Two experiments were conducted to investigate the effects of dietary sucralose on diet preference and growth performance of weaned piglets, and a third experiment was a 28-d safety study to examine if high-dose sucralose could affect the health state of weaned piglets. Methods In experiment one, 48 piglets had free access to a corn-soybean based diet and the same diet supplemented with 150 mg/kg sucralose for 15 d. In experiment two, 180 piglets were blocked into 5 treatments with 6 replications. They were fed basal diets supplemented with 0, 75, 150, 225, and 300 mg/kg sucralose for 28 days. In experiment three, 108 piglets were randomly assigned to 3 treatments and fed diets supplemented with 0, 150 (suitable level), and 1,500 (ten-fold suitable level) mg/kg sucralose for 28 d. Results The experiment 1 showed that piglets preferred (p<0.05) diets containing sucralose during experimental period. In experiment 2, piglets fed a diet supplemented with 150 mg/kg sucralose had a higher average daily gain (ADG) and average daily feed intake (ADFI) than pigs in the control group and other treatment groups during the experiment period. The concentrations of sucralose over 150 mg/kg may decrease feed intake. However, no difference in feed conversion ratio was observed. In experiment 3, piglets fed diet supplemented with 150 mg/kg sucralose had a higher ADG and ADFI than that of pigs in the control group and 1,500 mg/kg treatment groups during the experiment period. Clinical blood metabolites, organ index and histological morphology were not significantly different between sucralose treatments. Conclusion Sucralose can promote feed intake and thereby improve growth performance of weaned piglets. Moreover, inclusion of 1,500 mg/kg sucralose was demonstrated to have no observed adverse effects. Supplementing 150 mg/kg sucralose for weaned piglets is recommended in this study.

This study was aimed at evaluating the effects of activated charcoal-herb extractum complex (CHC) on antioxidant status, serum lipid metabolites and its safety supplement in weaning piglets. In experiment 1, a total of 216 piglets (Duroc × Landrace × Large White) weaned at 28 days of age with initial body weight of 8.55 ± 1.18 kg were assigned randomly to six treatment groups. each treatment group had six pens, with six pigs per pen. Pigs were fed a corn-soybean meal-based diet supplemented with 500, 1000, 1500 or 2000 mg kg−1 of CHC over two 14-d periods. Diets supplemented with 0 and 1000 mg kg−1 of montmorillonite (MMT) were set as the negative and positive controls, respectively. In experiment 2, pigs (n = 108) weaned at 28 days of age with initial body weight of 8.58 ± 0.04 kg were randomly assigned to three treatment groups. Each treatment group had six pens, with six pigs per pen. Pigs were fed a corn-soybean meal-based diet supplemented with 0, 1000 or 10,000 mg kg−1 of CHC over two 14-d periods. In experiment 1, on day 14, supplementation with CHC significantly decreased very low-density lipoprotein (VLDL) concentration while they decreased low-density lipoprotein (LDL) concentration on d 28, CHC at 500, 1000 or 1500 mg kg−1 significantly increase high-density lipoprotein (HDL) concentration. Supplementation with 500 or 1000 mg kg−1 CHC reduced serum malondialdehyde (MDA) concentration during the entire experimental period and increased the concentration of serum total superoxide dismutase (T-SOD) on d 14. CHC at 500 or 1000 mg kg−1 significantly reduced the liver MDA concentration and increased liver T-SOD concentration. In experiment 2, increased ADG was obvious during the first 14 days and the whole period in 1000 mg kg−1 supplemented pigs, similarly F: G was lowest in the first 14 days. There was no difference in growth performance, visceral index, haematological and serum biochemical parameters and visceral organs morphology between pigs fed 10,000 mg kg−1 of CHC and control. Together, 500 to 1000 mg kg−1 CHC was confirmed to improve antioxidant status, and serum lipid metabolites in this study and excess supplementation of CHC is safe in weaning piglets.

This study was conducted to evaluate the effects of activated charcoal-herb extractum complex (CHC) on the growth performance, immunological indices, intestinal morphology and microflora in weaning piglets to determine the optimal supplemental dose. A total of 216 weaned piglets (Duroc Landrace Large White) with an initial body weight of 8.55 1.18 kg were randomly assigned to six treatment groups; each treatment group had six pens, with six pigs per pen. The study period was 28 d. Pigs were fed a corn-soybean meal-based diet supplemented with 500, 1000, 1500 or 2000 mg kg 1 of CHC over two 14-d periods. Two additional diets containing 0 and 1000 mg kg 1 of montmorillonite were set as the negative and positive controls, respectively. Supplementation with 500 mg kg 1 of CHC significantly increased average daily gain compared with the positive and negative controls during phase I and the entire experimental period (P < 0.05). During phase I, 500 and 1000 mg kg 1 of CHC significantly decreased diarrhea incidence compared with the negative control, and increased serum IGF-1 and serum IgM levels compared with the controls (P < 0.05). CHC at 500 mg kg 1 significantly decreased the diarrhea score during the entire experimental period compared with the negative control (P < 0.05). On day 28, supplementation with 500 and 1000 mg kg 1 of CHC increased serum IgG, IL-1b, and duodenum and jejunum secretory IgA compared with the negative control and decreased duodenum and jejunum MDA levels compared with the controls (P < 0.05). Increased duodenum and jejunum villus height and an increased ratio of villus height to crypt depth were observed compared with the negative control and decreased viable counts of E. coli in the cecum were detected compared with the controls (P < 0.05). Collectively, the optimal dose of CHC was found to be 500 to 1000 mg kg 1 in this study.

Objective: The objective of this study was to investigate effects of supplementation of culture media from solid-state fermented Isaria cicadae (I. cicadae) on performance, serum biochemical parameters, serum immune indexes, antioxidant capacity and meat quality of broiler chickens.Methods: A total of 648 Arbor Acres male broiler chickens(1 d; average body weight, 42.93± 0.47 g) were randomly assigned to 6 treatments, each with six replicates and 18 broiler chickens per replicate. Broiler chickens were fed phase I (d 1 to 21) and phase II (d 22 to 42) diets. The phase I diets were corn and soybean-meal based diets supplemented with 0%, 2%, 4%, 6%, 8%, or 10% culture media from solid-state fermented I. cicadae respectively. The phase II diets were corn and soybean-meal based diets supplemented with 0%, 1.33%, 2.67%, 4.00%, 5.32%, or 6.67% culture media from solid-state fermented I. cicadae respectively.Results: In phase I, the broiler chickens with the supplementation of culture media had increased body weight gain and feed intake (linear and quadratic, p<0.05) with increasing inclusion of culture media. The levels of serum total antioxidant capacity (T-AOC), glutathione (GSH) and superoxide dismutase (SOD) increased linearly (p<0.05). In phase II, levels of serum T-AOC and interleukin-1β increased linearly (p<0.05), and GSH increased (p<0.05). In the kidney, GSH and glutathione peroxidase (GSH-Px) concentrations increased (linear and quadratic, p<0.05) and SOD concentration increased linearly (p<0.05). Compared to the control, shear force and drip loss of breast muscle decreased (linear and quadratic, p<0.05). Drip loss of leg muscle decreased linearly and quadratically (p<0.05).Conclusion: Dietary supplementation of culture media from solid-state fermented I.cicadae which was enriched in both wheat and residual bioactive components of I. cicadae enhanced the growth performance of broiler chickens. It also improved body anti-oxidative status and contributed to improve broiler meat quality.

Objective The objective of the study was to investigate the effects of zinc amino acid complex (ZnAA) on growth performance, hematological and biochemical parameters in weanling pigs. Methods In Exp. 1, a total of 216 Duroc×Landrace×Large White weanling pigs were assigned randomly to 6 dietary treatments. Each treatment had 6 replicates (pens) with 6 pigs each. The diets were corn-soybean meal based with supplementation of 0, 20, 40, 80, 120 mg Zn/kg from ZnAA or 40 mg Zn/kg from feed-grade zinc sulfate. The experiment lasted 42 days. In Exp. 2, a total of 180 weanling pigs were assigned randomly to 3 dietary treatments supplemented with 0, 80, or 800 mg Zn/kg from ZnAA. Results In Exp. 1, pigs fed 40 to 80 mg Zn/kg from ZnAA had higher (p<0.05) average daily gain (ADG) than the unsupplemented group during d 0 to 14. During d 0 to 42, the pigs fed 20 to 120 mg Zn/kg from ZnAA had increased (p<0.05) ADG. Pigs fed 20 to 120 mg/kg Zn from ZnAA had lower feed:gain (p<0.05), increased the activity of serum Cu-Zn superoxide dismutase on d 14, and increased serum Zn levels on d 42 (p<0.05). In Exp. 2, pigs fed diets with 800 mg Zn/kg had increased average daily feed intake during d 15 to 28 (p<0.05) compared to the unsupplemented group. During d 0 to 28, the pigs fed supplemental Zn had increased ADG (p<0.05). On d 14 and d 28, pigs fed supplemental Zn had higher the serum alkaline phosphatase activities (p<0.05). No significant differences were observed in the hematological parameters and organ indices. Conclusion Supplementation with 20 to 80 mg/kg Zn from ZnAA improved the growth performance in weaned pigs. The piglets can tolerate up to 800 mg/kg Zn from ZnAA with limited potential health effects.

对厂房结构而言,门式刚架轻钢结构是应用得最为广泛的一种结构形式,其经过多年的使用之后也会存在一定程度的破坏,导致结构的稳定性受到影响,因此需对其进行加固设计.以某门式刚架轻钢结构厂房为例,探讨了门式刚架轻钢结构厂房的加固设计.

在对钢结构进行设计的过程中,传统的设计方法是将端板连接按照刚性节点进行设计,且这种设计方法也多被应用在单层门式刚架结构的设计之中,在对于多层钢框架结构进行设计的过程中,如果再将端板连接视为刚性节点,往往不能有效地满足要求,尤其是对于多层钢框架结构的抗性能会造成重要的影响.将端板连接视为半刚性节点来进行设计,更加有利于多层钢框架结构的设计,因此主要就探讨了端板连接半刚性节点对多层框架设计的影响,以期能够为多层框架结构的设计提供相应的参考.

An experiment was designed to study the effects ofβ-mannanase (CTCzyme) on growth performance and nutrient digestibility in broiler chickens fed with low energy corn soybean meal diets.A total of 648,one-day-old,male Arbor Acres broiler chicks were purchased and randomly allocated to six treatments with six replicates of eighteen chicks each.The experiment lasted 42 days which divided into starting phase (0～21 d) and finishing phase (22～42 d).The trial basal diet was corn-soybean meal diet.The chickens were fed with high energy diets (metabolizable energy (ME)12.55 MJ/kg (starter) and 12.97 MJ/kg (finisher)),low energy control diets (ME12.13 MJ/kg (starter) and 12.55 MJ/kg (finisher)),and low energy control diets supplemented β-mannanase 300,400,500 and 1 000 mg/kg,respectively.The results indicated that during 22～42 d and 0～42 d,the average daily gain (ADG) and feed conversion ratio (F/G) significantly (P＜0.05) and linearly (P＜0.05) improved and decreased in chickens fed with diets supplementedβ-mannanase 500 and 1 000 mg/kg in low energy diets,compared with low energy control diet group.Compared with high energy diet group,digestibility of dry matter,crude protein and gross energy had no significant differences in birds fed withβ-mannanase 500 and 1 000 mg/kg in low energy diets (P＞0.05).Moreover,digestibility of crude protein was linearly (P=0.04) increased with the increasing dosage ofβ-mannanase.The appropriate addition amount ofβ-mannanase was 529.5 and 503.2 mg/kg,based on singleslope polyline model of ADG and F/G during all period,respectively.Integrating the growth performance and nutrient digestibility,the optimum dosage ofβ-mannanase in broiler corn-soybean meal diets was 500 mg/kg.

Objective The goal of this study was to investigate the effects of cupric citrate (CuCit) on growth performance, antioxidant indices, serum lipid metabolites, serum immune indices, and tissue residues of copper (Cu), zinc, and iron in weaned pigs. Methods A total of 180 weaned pigs (Duroc×Landrace×Large White) with an average body weight of 8.98±1.21 kg were randomly assigned to a corn-soybean meal control ration, or 4 similar rations with 30, 60, 120, or 240 mg/kg Cu as CuCit. All diets contained 10 mg/kg Cu as cupric sulfate from the vitamin-mineral premix. The experiment was divided into two phases: 0 to 14 d (phase 1) and 15 to 28 d (phase 2). Results Average daily gain (ADG; linearly, p<0.01) and average daily feed intake (ADFI; linearly and quadratically, p<0.05) were affected by an increase in CuCit during phase 2. Overall period, ADG (p<0.05) and ADFI (p<0.01) were linearly increased with increasing dietary levels of CuCit. Serum malondialdehyde concentrations (p<0.05) and glutathione peroxidase activity (p<0.01) linearly decreased and increased respectively with an increase in CuCit. Serum levels of Cu-Zn superoxide dismutase were linearly affected with an increase in CuCit (p<0.01). Hepatic malondialdehyde levels decreased with an increase in CuCit (linearly and quadratically, p<0.01). Serum total cholesterol concentrations were quadratically affected (p<0.05) and decreased in pigs fed Cu as CuCit at 60 and 120 mg/kg and increased in pigs fed 240 mg/kg Cu as CuCit. Serum high-density lipoprotein concentrations were linearly affected with an increase in CuCit (p<0.01). Serum IL-1β levels were quadratically affected (p<0.05) by dietary treatment. Compared with other treatments, 240 mg/kg Cu from CuCit quadratically increased hepatic (p<0.01) and renal (p<0.05) Cu concentrations, and quadratically decreased hepatic and renal iron concentrations (p<0.05). Conclusion Cu administered in the form of CuCit at a dosage range of 30 to 60 mg/kg, effectively enhanced the growth performance and antioxidant status of weaned pigs.

目的 分析蚌埠市麻疹流行特征及趋势,为降低麻疹发病率提供线索和参考.方法 收集2012～2016年麻疹监测数据,采用描述性流行病学方法对麻疹病例进行分析.结果 蚌埠市2012～2016年麻疹确诊病例1049例,年平均发病率为6.26/10万.发病趋势呈现二年一次周期性升高,病例高度散发;有明显的季节性,3～5月为高发月份;年龄分布以14岁以上人群为主,职业分布以散居儿童为主;麻疹病例中含麻疹成分疫苗免疫史为0剂次827例,占78.84％.结论 蚌埠市现阶段麻疹处于疫情的反复期,应加强含麻疹成分疫苗常规免疫工作,应建立和落实综合防控措施,防止麻疹的流行.

儿童预防接种信息化是利用电脑互联网对儿童的基本信息和预防接种信息进行管理,利用网络数据交换与共享,解决流动儿童预防接种和漏种工作,不仅提高工作效率,而且对提高预防接种管理工作质量发挥积极作用.儿童预防接种信息管理系统做为国家公共卫生信息系统的重要组成部分[1],可以实现信息管理和对流动儿童接种信息的共享[2].本文根据安徽免疫规划信息管理系统的数据,结合现场抽样调查,对蚌埠市免疫接种工作情况进行分析.结果报道如下.

本试验研究了饲粮添加不同水平约氏乳杆菌对断奶仔猪生产性能、血液学指标、脏器指数和组织病理学的影响,以评价约氏乳杆菌的耐受性.试验选用180头28日龄三元杂交(杜×长×大)断奶仔猪,随机分为5个处理,每个处理6个重复,每个重复6头猪,对照组基础饲粮中不添加约氏乳杆菌,4个处理组分别在基础饲粮中添加1.0×105、1.0×106、1.0×107和1.0×108 CFU/g约氏乳杆菌,试验期28 d.结果表明:与对照组比较,饲粮添加1.0×105～1.0×108 CFU/g约氏乳杆菌处理组的仔猪,其耗料增重比均显著降低(P＜0.05),且各处理组间差异不显著(P＞0.05);饲粮添加1.0×107和1.0×108 CFU/g约氏乳杆菌组,其肝脏指数显著高于其他各组(P＜0.05),其他指标各组间均无显著差异(P＞0.05).综上所述,饲粮添加约氏乳杆菌会显著改善断奶仔猪耗料增重比;饲粮添加1.0×107和1.0×108 CFU/g约氏乳杆菌对断奶仔猪肝脏指数有显著影响;饲粮添加高达1.0×108 CFU/g约氏乳杆菌对断奶仔猪组织病理观察无不良影响.

本试验研究了日粮添加不同水平约氏乳杆菌菌粉对断奶仔猪生产性能、免疫指标、肠道pH值和有机酸含量的影响.试验选用180头28日龄平均初始体重为8.03 kg杜×长×大三元杂交断奶仔猪,随机分为5个处理,每个处理6个重复,每个重复6头猪.对照组日粮为玉米-豆粕型基础日粮,4个试验组日粮分别在基础日粮中添加1.0×105、1.0×106、1.0×107、1.0×108 CFU/g约氏乳杆菌菌粉,试验期28 d.结果表明:日粮添加约氏乳杆菌菌粉显著改善了断奶仔猪的耗料增重比(P＜0.05);日粮添加1.0x 106～ 1.0× 108 CFU/g约氏乳杆菌菌粉极显著降低仔猪的血清IgM含量(P＜0.01),显著降低了盲肠pH值(P＜0.05);日粮中添加1.0×107、1.0× 108 CFU/g约氏乳杆菌菌粉显著降低了回肠pH值(P＜0.05);而日粮中添加1.0×108 CFU/g约氏乳杆菌菌粉显著提高仔猪结肠食靡的乳酸含量(P＜0.05).因此,日粮中添加约氏乳杆菌菌粉可以提高耗料增重比,改善肠道内环境.

本研究探讨了日粮中添加不同水平蒙脱石对生长肥育猪生长性能、血清矿物元素含量和骨骼特征的影响.试验选用120头体重(34.79±3.42)kg健康杜×长×大三元杂交猪,按体重相近、公母各半的原则,随机分为5个处理,分别饲喂在基础日粮中添加0、0.5％、1.0％、2.5％和5.0％蒙脱石的日粮,每个处理6个重复,每个重复4头猪.试验期56 d,分生长和肥育2个阶段饲养.结果表明:日粮中蒙脱石添加量这5.0％时会显著降低猪肥育阶段和试验全期日增重和饲料转化效率(P＜0.05);随日粮蒙脱石的添加水平升高,猪骨骼中钾、钠、镁、锌、铁、铜和锰的含量极显著减少(P＜0.01).添加量达2.5％对,骨骼钙含量显著增加(P＜0.05),磷含量也有增加的趋势(P＞0.05).综上,日粮添加蒙脱石水平达到或高于2.5％时,会降低生长肥育猪生长性能,减少骨骼微量元素沉积.

A 97-day feeding trial was conducted to investigate the effects of dietary chromium methionine (CrMet) on performance, carcass traits, meat quality, fatty acid profiles of fat, tissue chromium concentrations, and antioxidant status in growing-finishing pigs. A total of 180 crossbred pigs with a mean initial body weight (BW) 30.18 ± 0.28 kg were allotted to 5 treatments with 6 replicates per treatment and 6 pigs per pen in a randomized complete block design based on BW and sex. Treatments were added with 0 (control), 100, 200, 400, and 800 μg/kg chromium as CrMet. Blood samples were obtained from the anterior vena cava on days 97. Carcass characteristics, pork quality, and tissue chromium concentration data were collected from one pig per pen. The results indicated that supplemental CrMet did not significantly affect growth performance, carcass traits, or meat amino acid profiles. Chromium at 100, 400, and 800 μg/kg decreased drip loss but increased shear force (P < 0.05). Pigs fed 100 or 400 μg/kg had a higher 24-h pH than the control (P < 0.05). While meat color, muscle moisture, crude protein, or crude fat were not affected by CrMet. Supplemental 800 μg/kg chromium reduced C18:0 levels in belly fat (P < 0.05), and chromium supplementation increased cis-9, trans 11-conjugated linoleic acid levels linearly (P < 0.05). Dietary CrMet supplementation increased serum, kidney, and muscle chromium contents (P < 0.05) but did not affect liver chromium contents. Besides, tissue chromium concentrations were increased linearly with increased chromium dosage (P < 0.05). Chromium at 400 μg/kg increased serum glutathione peroxidase activities (P < 0.05), and chromium at 800 μg/kg decreased serum total antioxidant capacity levels (P < 0.05). Nevertheless, liver and kidney antioxidant status were not significantly affected by CrMet. These results indicated that dietary supplementation CrMet did not significantly influence growth and carcass traits, but improved meat quality at the expense of tenderness. Therefore, the long-term exposure to 800 μg/kg chromium affected fatty acid compositions and reduced serum antioxidant capacity.

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.

The effects of dietary chromium methionine (CrMet) on growth performance, serum metabolites, endocrine parameters, antioxidant status, and immune traits in growing pigs were investigated. A total of 180 crossbred pigs (30.18 ± 0.28 kg initial body mass) were randomly divided into five groups, each group with six pens, six pigs per pen. Pigs were fed on the same basal diet supplemented with 0 (control), 100, 200, 400, and 800 μg/kg Cr from CrMet for 35 days. The results showed that supplemental CrMet did not affect growth performance. Cr at 200–800 μg/kg significantly decreased serum glucose levels (P < 0.05), while other serum metabolites were unaffected by Cr supplementation. Serum growth hormone (GH) levels were significantly decreased by Cr addition (P < 0.05). Furthermore, serum insulin-like growth factor I (IGF-I) levels were linearly decreased with increased Cr dose, and a significant reduction was observed in pigs fed 800 μg/kg Cr diets (P < 0.05). Serum immunoglobulin A, G, and M concentrations were increased linearly with increased Cr dosage, and pigs fed 400 μg/kg Cr had greater serum immunoglobulin M contents (P < 0.05). Cr at 400 μg/kg significantly increased serum superoxide dismutase and total antioxidant capacity activities (T-AOC) (P < 0.05). However, Cr at 800 μg/kg increased serum catalase activities, while decreasing serum T-AOC contents (P < 0.05). Additionally, there was a significant increase in serum malondialdehyde levels for pigs fed 800 μg/kg Cr diets (P < 0.05). These results indicated that dietary supplementation CrMet decreased serum glucose, GH, and IGF-I levels. Besides, supplemental 400 μg/kg Cr as CrMet improved serum antioxidant status and immune responses, but additional 800 μg/kg Cr resulted in lipid peroxidation in growing pigs.

本试验旨在研究日粮中添加不同水平酵母硒对内仔鸡生长性能和免疫功能的影响.试验选用540只1日龄AA肉仔鸡公雏,随机分为5个处理,每个处理6个重复,每个重复18只鸡,5个处理组分别在基础日粮中添加0(对照组)、0.1、0.2、0.3、0.4 mg/kg的酵母硒(以硒计),试验期42 d.结果表明:日粮中添加0.1～0.4 mg/kg酵母硒对肉仔鸡生长性能无显著影响(P＞0.05),对血清IgG、IgM、IgA含量和免疫器官指数无显著影响(P＞0.05),但0.4 mg/kg酵母硒显著提高了肉仔鸡第14天的新城疫抗体滴度和第21天的T-淋巴细胞转化率(P＜0.05),0.3、0.4 mg/kg酵母硒极显著提高了第42天的T-淋巴细胞转化率(P＜0.01).因此,日粮中添加酵母硒对肉仔鸡生长性能无影响,但0.3～0.4 mg/kg酵母硒提高了T-淋巴细胞转化率,对新城疫抗体滴度也有一定的提高作用.