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乳酸菌素对肉鸡生产性能和屠宰性能的影响 总被引：3，自引：3，他引：0
为了探讨乳酸菌素对肉鸡生产性能和屠宰性能的影响。300只1日龄健康肉仔鸡随机分为5组,每组设4个重复,每个重复15只。Ⅰ组为空白对照组,饲喂基础日粮,Ⅱ组为抗生素对照组,Ⅲ、Ⅳ、Ⅴ组分别在基础日粮中添加50,100,200 mg/kg乳酸菌素。比较各处理组对肉鸡的生产性能和屠宰性能的影响。试验期70天。结果表明,各组间平均日采食量差异不显著(P>0.05);Ⅱ和Ⅳ组平均日增重较Ⅰ组显著提高(P<0.05),而Ⅱ和Ⅳ组间的平均日增重差异不显著(P>0.05);Ⅳ组料重显著低于Ⅰ组(P<0.05),与Ⅱ组差异不显著(P>0.05)。屠宰性能方面,半净膛率和全净膛率各组间差异不均显著(P>0.05);胸肌率及腿肌率,Ⅱ、Ⅳ组较Ⅰ组显著提高(P<0.05),其他各组间差异不显著(P>0.05)。可见,添加100 mg/kg乳酸菌素可显著降低肉鸡的料重比和显著提高胸肌率及腿肌率,其结果与抗生素组相同。 相似文献
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大豆肽和乳酸菌素对蛋鸡生产性能、蛋品质及血液生化指标的影响 总被引：1，自引：0，他引：1
本试验旨在研究大豆肽和乳酸菌素对蛋鸡生产性能、蛋品质及血液生化指标的影响.选取336日龄健康罗曼商品蛋鸡576只,随机分成8组,每组3个重复,每个重复24只鸡.对照组饲喂基础饲粮,试验组分别饲喂在基础饲粮中添加0.075％、0.15％、0.3％大豆肽和0.1％、0.2％、0.4％乳酸菌素及0.15％大豆肽+0.2％乳酸菌素的试验饲粮.预试期1周,正试期4周.结果表明:1)饲粮中添加0.15％大豆肽或0.2％乳酸菌素均可显著提高蛋鸡产蛋率(P＜0.01),降低料蛋比(P＜0.05),显著提高哈夫单位(P＜0.05),对平均日采食量、蛋壳厚度、蛋壳强度无显著影响(P＞0.05).2)饲粮中添加0.15％大豆肽或0.2％乳酸菌素可以极显著或显著提高血浆谷草转氨酶(GOT) (P ＜0.01,P＜0.05)、谷丙转氨酶(GPT)活性(P＜0.01),降低血浆尿酸含量(P＜0.01),对血浆总蛋白、清蛋白、球蛋白含量无显著影响(P＞0.05).由此可见,饲粮中添加0.15％的大豆肽或0.2％的乳酸菌素均能提高蛋鸡生产性能和蛋品质,改善蛋白质代谢,并且0.15％大豆肽+0.2％乳酸菌素的联合应用优于单独添加大豆肽或乳酸菌素. 相似文献
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ABSTRACT 1. The heterologous expression and biological function of the Lactobacillus bacteriocin plantaricin K (PlnK) remain largely unknown. 2. In this study, PlnK was efficiently expressed in competent E. coli BL21 (used in transformation and protein expression) after 12 h, at 37°C and in 0.4 mmol/l isopropyl β- d-1-thiogalactopyranoside (IPTG). 3. The inhibitory bacterial spectrum of recombinant PlnK was investigated and indicated that levels of PlnK above 0.10 mg/ml produced an obvious inhibitory effect on gram-positive bacteria and gram-negative bacteria in vitro. 4. The effects of PlnK on intestinal immune function and the gut microbiome distribution in broilers were studied. The results revealed that, after consuming 2.50 × 10?3 mg/ml of PlnK in water for one week, at the phylum level, the abundance of Firmicutes was increased and the abundance of Bacleroidetes was decreased. At the family level, the abundance of Lachnospiraceae, Ruminococcaceae and Streptococcaceae were significantly improved, but the abundance of Bacteroidaceae was reduced. At the genus level, the abundances of Lachnoclostridium, Streptococcus and Ruminococcaceae-UCG-013, were significantly up-regulated, and the abundance of Bacteroides was down-regulated. 5. After oral liquid intake of PlnK for one week, levels of secretory immunoglobulin A (sIgA) in the duodenal mucus were not significantly increased, but the mRNA levels of TLR3, MDA5, IFN-α, IFN-β, IFITM3 and IFITM10 in the duodenum were significantly reduced. 6. This study demonstrated that the recombinant PlnK could adjust the intestinal microbiome distribution and downregulate the IFN pathway. 相似文献
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