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新型猪用复合益生菌制剂的研制与开发
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摘要
益生菌制剂以其无毒、无耐药性、无残留以及效果显著、成本低、能有效补充消化道内的有益微生物等诸多优点,已成为了理想的抗生素替代品而被广泛应用。近来的研究表明,高活菌制剂的功效和安全性,其关键则是生产菌株的选择;另外多菌种混合剂型的研究也显得非常重要。本论文通过从猪的粪便中分离鉴定益生菌,进行乳酸菌耐酸、耐胆盐试验与体外抑制致病性大肠杆菌试验,研究不同复合益生菌制剂对断奶仔猪生产性能、抗氧化能力、肠道菌群以及免疫功能等的影响,最后研究复合益生菌制剂的发酵工艺,对为实现其产品的产业化,推动饲料添加剂产品向高效、无公害的方向发展,实现畜产品的绿色化具有重要的应用意义。各试验的研究内容如下:
     试验1猪源益生乳酸菌的分离鉴定
     从健康猪的20份新鲜粪便中分离到一定范围的乳酸菌共37株。应用常规形态学、生化鉴定(自动细菌检测仪)和分子鉴定方法进行鉴定。结果表明:分离到的37株乳酸菌包括3株嗜酸乳杆菌(L. acidophilus),5株罗伊氏乳杆菌(L reuteri)、5株动物乳杆菌(L. animalis)、4株鼠李糖乳杆菌(L. rhamnosus)、3株肠膜样明串珠菌(L. mesenteroides)、3株格氏乳球菌(L. garvieae)、3株乳酸乳球菌乳酸亚种(L. subsp. lactis)、2株嗜热链球菌(S. thermophilus)、5株屎肠球菌(E. faeciμm)和4株粪肠球菌(E. faecalis)。这一结果为新型猪用复合微生态制剂的研制与开发提供了基础条件。
     试验2猪源乳酸菌耐酸、耐胆盐试验与体外抑制致病性大肠杆菌作用研究
     对从健康仔猪新鲜粪便分离的12株乳酸菌菌株进行耐酸试验和耐胆盐试验,筛选出4株有效菌株。分别将这4株乳酸菌单独、混合与K88共培养;取4种乳酸菌单独和混合培养的菌液、发酵滤液和菌体用牛津杯做K88抑制试验;分别将培养滤液经过乳酸脱氢酶和碱处理做K88抑制试验。结果表明:4种乳酸菌皆具有抑菌功能,但相互之间有差异;用乳酸脱氢酶或碱处理后抑菌能力明显下降,说明乳酸菌是通过产生有机酸尤其是乳酸对K88进行有效抑制。4种菌混合培养的抑菌能力强于单独培养。
     试验3不同复合益生菌制剂对断奶仔猪生产性能及抗氧化能力的影响
     为了研究不同复合益生菌制剂对断奶仔猪生产性能及抗氧化能力的影响,选取4周龄健康杜×长x大三元杂交断奶仔猪60头,随机分成5组,每组3个重复,每个重复4头。A组为饲喂基础日粮的对照组,B组为饲喂基础日粮加市售的某公司生产的猪用益生菌制剂组,C、D、E组为基础日粮分别加3种不同的自制复合益生菌产品试验组。试验结果表明,添加C组、D组、E组益生菌制剂能显著改善仔猪的生长性能,提高断奶仔猪的日增重和饲料转化效率,其中试验组C组仔猪日增重与对照组相比提高18.03%(P<0.05),料肉比下降了8.86%(P<0.01),试验组D组仔猪日增重提高16.52%(P<0.05),料肉比下降了8.12%(P<0.05),试验组E组仔猪日增重提高15.34%(P<0.05),料肉比下降了7.75%(P<0.05);添加C组、D组、E组益生菌制剂能显著改善仔猪全血中的GSH-PX的活性和血清中SOD的活性,显著降低血清中的MDA含量,说明提高了断奶仔猪的抗氧化能力,其中C组、D组效果较好。
     试验4不同复合益生菌制剂对断奶仔猪肠道菌群及免疫功能的影响
     为了研究益生菌对断奶仔猪肠道菌群及免疫功能的影响,选取4周龄健康杜×长×大三元杂交断奶仔猪60头,随机分成5组,每组3个重复,每个重复4头。A组为饲喂基础日粮的对照组,B组为饲喂基础日粮加市售的某公司生产的猪用益生菌制剂组,C、D、E组为基础日粮分别加3种不同的自制复合益生菌产品试验组。试验结果表明,添加益生菌的各试验组粪便中大肠杆菌的含量降低,乳酸菌的含量增加,显示了其对大肠杆菌等肠道致病菌有良好的抑制作用;在提高动物机体免疫力方面,C组、D组益生菌制剂能促进ConA非特异性刺激外周血液T淋巴细胞的转化,C组、D组T淋巴细胞转化水平分别提高了20.4%和17.53%(p<0.05),C组、D组、E组益生菌制剂还能有效提高仔猪血清中的细胞因子IL-2和TNF-α水平。
     试验5复合益生菌制剂发酵条件的优化
     本实验通过将4株益生菌单独和混合培养,测定各株益生菌的活菌数来评价了4株益生菌的共生关系;比较了复合益生菌在YEPD、MRS、麦芽汁和豆面粉培养基上的生长状况,筛选出了可用于工业化生产复合益生菌制剂的培养基;并对该培养基中豆面粉比例作了优化,筛选出最佳搭配比例;同时通过单因子试验和正交试验对复合益生菌制剂工业化生产的工艺条件作了优化,确定了最优的生产条件。结果表明4株益生菌能较好的共生;豆面粉培养基为工业化生产复合益生菌制剂较为适宜的培养基;该培养基中豆面粉最适比例为2%:8%;最佳的工业化生产条件为:发酵时间32h,接种量5%,发酵温度34℃,恒定pH6.0,溶氧DO40%。在上述最优培养条件下,4株益生菌活菌数均达到108CFU/mL以上。
Probiotics praeparatum has become the ideal alternatives for antibiotic and been widely applied, with the series advantages of non-toxic, no tolerance, no residual, obvious effect, low cost, and which can offer a effective supplement of beneficial microorganism in digestive tract. Recent researches showed that the key for the efficacy and safety of highly active fungus-preparationis was the selection of producing strain; In addition, the study of multi-strains mixture also appears very important. Based on the previous research, study on the isolation and identification of probiotics from pig manure, the acid and bile tolerance experiment and in vitro inhibition for pathogenic escherichia coli, the influence of various complex-probiotic-preparation on the performance, antioxidant capacity, intestinal flora and immune function, and the fermentation technology of complex-probiotic-preparation, has practical significance for the industrialization of products, the development to high efficiency and non-pablic hazard bio-feed additives, and the green revolution of animal products. The contents of each experiment are as follows:
     Experiment1Isolation and identification of pig origin lactobacillus
     37strains lactobacillus were isolated from20portion fresh stool by healthy swine. Conventional morphology, biochemical identification and molecular identification were applied to characterize. Results:37strains separated lactobacillus contained3strains Lactobacillus acidophilus (L. acidophilus),5strains Lactobacillus reuteri(L. reuteri),5strains Lactobacillus animalis (L. animalis),4strains Lactobacillus rhamnosus (L. rhamnosus),3strains Lactobacillus mesenteroides (L. mesenteroides),3strains Lactobacillus garvieae (L. garvieae),3strains Lactobacillus subsp. lactis (L. subsp. lactis),2strains Streptococcus thermophilus (S. thermophilus),5strains Enterococcus faeciμm (E. faeciμm) and4strains Enterococcus faecalis (E. faecalis), which provided a basic condition for the research and development of the combined microecology praeparatum on swine.
     Experiment2Study on the acid and bile tolerance experiment for pig origin lactobacillus and the effect of in vitro inhibition for pathogenic escherichia coli
     12strains lactobacillus separated from healthy piglet intestine were applied for the acid and bile tolerance experiment, and4available bacterium strains were screened to culture together with K88alone and in combination; bacterial liquid, fermentation filtrate and thallus from culture4strains lactobacillus together with K88alone and mixed were applied for the K88inhibition test by the method of Oxford Cup; culture filtrate were applied for the K88inhibition test by the treatment of lactate dehydrogenase and alkali. Results:all the4strains lactobacillus owned the antibacterial ability but still had a difference between them; the antibacterial ability decreased significantly when treated by lactate dehydrogenase and alkali, which indicated that lactobacillus owned the antibacterial ability through provided organic acids especially lactic acid. The antibacterial ability for4strains lactobacillus would be enhanced when mixed culture rather than solitary culture.
     Experiment3Effects of probiotics on growth performance and anti-oxidation of weaned piglets
     This trial was conducted to study the effect of probiotics on the intestinal flora and immunity of weaned piglets.60Durocx(LandracexLargewhite) weaned piglets (28d) were randomly divided into5groups with3replications per treatment and4weaned piglets per replication, normal control group(A group) which fed with a basal diet, probiotics group(B group) which fed with a basal diet added probiotic products from a company, and complex-probiotic groups(C, D, E groups) which fed with a basal diet added3different self-made complex-probiotic-preparation. Results indicated that group C, D, E could significantly improve the performance of piglets and the average daily gain (ADG) and feed to gain ratio (F/G) of weaned piglets.ADG in group C appeared18.03%(P<0.05) higher and F/G appeared8.86%(P<0.01) lower when compared with control group. ADG in group D appeared16.52%(P<0.05) higher and F/G appeared8.12%(P<0.05)lower when compared with control group. ADG in group E appeared15.34%(P<0.05) higher and F/G appeared7.75%(P<0.05) lower when compared with control group. Supplement of probiotic in group C, D, E could also significantly increase the activity of SOD in serum and GSH-PX in blood, and r significantly reduce the MDA content in serum, which indicated that probiotic had positive effects on the anti-oxidation of weaned piglets, among which group C and D had better effect.
     Experiment4Effects of probiotics on intestinal flora and immunity of weaned piglets
     This trial was conducted to study the effect of probiotics on the intestinal flora and immunity of weaned piglets.60Durocx(LandracexLargewhite) weaned piglets (28d) were randomly divided into5groups with3replications per treatment and4weaned piglets per replication, normal control group(A group) which fed with a basal diet, probiotics group(B group) which fed with a basal diet added probiotic products from a company, and complex-probiotic groups(C, D, E groups) which fed with a basal diet added3different self-made complex-probiotic-preparation. Results indicated that the content of escherichia coli from the stools of each experimental group reduced when added probiotics, as well as the content of lactobacillus increased, which showed a strong inhibition to enteric pathogenic bacteria; probiotic added in group C and group D would promote ConA to non-specific stimulate the transformation of T-cells in peripheral blood as the aspect of immunity improved, and the transformation levels of T-cells in group C and group D respectively increased20.4%and17.53%(p<0.05). Probiotic preparation in group C, D, E could also effectively improve the levels of IL-2and TNF-α cytokine in piglets serum.
     Experiment5Study on fermentation condition optimization of complex-probiotic-preparation
     The research was to evaluate the symbiotic relationship among the4strains of probiotics by determining viable count of experiments, which the4strains were solitary and mixed cultivation. The growth state of complex-probiotics in mediums of YEPD, MRS, Wort and Soybean and Flour Power were compared and mediums were picked out for the industrialized production of complex-probiotic-preparation; the proportion of soybean and flour power in mediums was optimized and the optimal match of them was determined in this research; in addition, technology conditions of the industrial production of complex-probiotics-preparation were also optimized by single-factor and orthogonal design experiment and determined the optimal technology conditions. Results indicated that the4strains of probiotics could live together and complex-probiotics could grow in soybean and flour power medium more suitable than in others; the proportion of soybean and flour power in mediums was2%:8%and the optimal technology condition was determined:fermentation time32h, inoculation amount5%, temperature34℃, constant pH6.0and dissolved oxygen (DO)40%. Under these optimum conditions, all the viable bacteria count of4strains could reach108CFU/mL.
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