【摘要】 本试验研究了不同水平的γ-氨基丁酸(GABA)对断奶仔猪生产性能和血液激素水平的影响,旨在探讨GABA对断奶仔猪的生长和激素变化的调节作用。试验采用随机区组设计将45头28日龄杂交断奶仔猪分为3个处理,每个处理5个重复,每个重复3头猪,分别饲喂添加0、0.04%和0.08%GABA的日粮。试验期28 d。试验结果表明:在43～56日龄,GABA显著改善了仔猪的平均日增重(P=0.048 9)和日采食量(P=0.035 6),但对料重比无显著影响(P>0.05)。在试验全期(28～56日龄),随着日粮中GABA水平的增加,仔猪的日采食量(P=0.110 7)和平均日增重(P=0.131 7)呈增加趋势。0.08%的GABA可以显著增强42日龄仔猪血清胃泌素水平,0.04%和0.08%GABA均可显著增强56日龄仔猪血清胃泌素水平(P<0.05)。0.08%GABA均能显著提高42日龄和56日龄仔猪血清胰岛素水平(P<0.05)。42日龄时,2个GABA组血清游离脂肪酸较对照组有显著升高,56日龄时,日粮添加0.08%的GABA显著了提高血清游离脂肪酸水平(P<0.05)。42日龄时,日粮添加0.08%GABA的仔猪血清脂肪酶活性较对照组有显著升高(P<0.05);56日龄时,2个GABA组血清脂肪酶活性均显著升高,且0.08%GABA组较0.04%GABA组也有显著增强(P<0.05)。本试验结果提示GABA能够短期改善仔猪的采食量和日增重,并调节与采食关系较为密切的胃泌素变化。更多还原

【Abstract】 To explore the effects of γ-amino butyric acid (GABA) on growth performance and hormone levels in serum of weanling piglets, 45 cross-bred piglets weaned at age of (28 ± 2) d were randomly allotted to be fed one of three diets containing 0, 0. 04% or 0. 08% GABA for 28 days. There were five replicates per treatment with three piglets in each replicate. Results showed that GABA increased average daily gain (P = 0. 048 9) and average daily feed intake (P = 0. 035 6) from 43 to 56 days of age (P<0. 05). No significant effect of GABA was observed on the ratio of feed to gain (P>0. 05). There was an increasing tendency of feed intake (P = 0. 110 7) and average daily gain (P = 0. 131 7) with supplementary levels of GABA during the whole trial period. The supplementation of 0. 08% GABA increased the levels of gastrin and insulin in serum of piglets at 42 and 56 days of age (P<0. 05). And 0. 04% GABA increased the level of gastrin in serum of piglets at 56 days of age (P<0. 05). Free fatty acid (FFA) in serum of piglets fed GABA increased significantly (P<0. 05) at 42 days of age, and 0. 08% GABA increased the level of FFA in serum of piglets at 56 days of age (P<0. 05). Moreover the two GABA groups had a higher lipase activity in serum of piglets at 42 and 56 days of age, and the lipase activity in serum of piglets in 0. 08% GABA group increased compared with 0. 04% GABA group. The results indicated that GABA improved feed intake and average daily gain in a short-term mode, which was involved in changed gastrin production modulated by GABA.更多还原