摘要
试验采用含钙0.88％和1.78％的玉米—豆饼型基础饲粮(含锌29ppm,添加0.10和40ppm锌(ZnSO_4·7H_2O)。结果表明,随着饲粮锌水平的提高,雏鸡增重显著提高(P<0.01),这种效应随着雏鸡周龄的增长愈趋明显。饲粮高钙使雏鸡前期增重显著降低(P<0.01),后期效应愈趋缓解。血清碱性磷酸酶的活性随着饲粮锌水平的提高而显著提高(P<0.01),饲粮高钙使之显著降低(P<0.01)。饲粮加锌使血清白蛋白含量显著高于未加锌组(P<0.05),饲粮高钙使血清白蛋白含量显著降低(P<0.01),使血清球蛋白含量显著提高(P<0.01),而血清总蛋白含量不受饲粮钙水平显著影响(P>0.05)。肝脏(P<0.05)、肾脏(P<0.01)、胰脏(P<0.01)、胫骨(P<0.01)以及粪便排泄物(P<0.01)中锌含量随饲粮锌水平的提高而显著提高,肺脏锌含量没有明显变化(P>0.05)。饲粮高钙使肾脏(P<0.05)、肺脏(P<0.01)、胫骨(P<0.05)锌含量显著降低,使粪便排泄物中锌含量显著提高(P<0.05)。饲粮中含锌29ppm,不能满足雏鸡维持正常代谢和生长发育的营养需要,饲粮高钙时,饲粮总锌69ppm为宜。
Experiment was conducted to study the effect of high dietary calcium on zinc utilization in chicks using corn-soy basal diet (29 ppm zinc content) supplemented with O, 10 and 40 ppm zinc as ZnSO_4·7H_2O. Results showed that with increasing of dietary zinc level weight gain increased significantly (P<0.01). High dietary calcium decreased weight gain significantly (P<0.01) at the earlier stage. Serum alkaline phosphatase activity was significantly increased (P<0.01) with increasing dietary zinc level, but decreased (P<0.01) with high dietary calcium.Serum albumin content was higher in zinc supplemented chicks than that of the control (P<0.05). High dietary calcium decreased serum albumin content (P<0.01) but serum globin content increased (P<0.01). Zinc content in liver (P<0.05), kidney (P<0.01), pancreas (P<0.01), tibia (P<0.01) and faecal excreta (P<0.01) increased with increasing dietary zinc. High dietary calcium reduced zinc content in the kidney (P<0.05), lung(P<0.01) and tibia(P<0.05). There was an increase of zinc in the faecal excreta (P<0.05) with high dietary calcium. The results indicated that 29 ppm zinc in corn-soy basal diet did not meet the requirement for chicks to maintain metabolism and development. When the diet contained high level calcium 39 ppm total zinc was not sufficient and 69 ppm total zinc was suggested.
基金
中国科学院科学基金
关键词
雏鸡
饲料
锌
鸡
Chicks, dietary, zinc utilization
