饲粮钙锌含量对蛋鸡生长发育血液生化指标和体内锌含量的影响

EFFECTS OF CALCIUM AND ZINC LEVELS IN REARING DIETS ON GROWTH BIOLOGICAL PARAMETERS AND TISSUE MINERAL ELEMENT CONTENT IN LEGHORN-TYPE CHICKENS

饲粮低锌(29ppm)和高锌(1029ppm)虽未引起明显的临床症状,但体增重、采食量和饲料利用效率都随饲粮锌水平提高而升高。饲粮高钙(1.36％)对体增重、采食量和饲料利用效率无显著影响。饲粮高锌使肾脏重(P<O.05)、输卵管重(P<0.01)、输卵管长(P<0.01)显著提高,使胫骨长显著缩短(P<0.05)。饲粮高钙使卵巢重(P<0.05)、输卵管重(P<0.05)和输卵管长(P<0.01)显著降低。随着饲粮锌水平的提高,血清碱性磷酸酶活性显著提高(P<0.01,),血清总蛋白含量不受饲粮锌水平影响,饲粮高锌和低锌使血清白蛋白含量显著低于适锌对照(P<0.05),饲粮高锌使血清球蛋白含量显著提高(P<0.01)。血清碱性磷酸酶活性和血清总蛋白含量不受饲粮钙水平影响(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)。随着饲粮锌水平的升高,血清(P<0.01)、肝脏(P<0.01)、肾脏(P<0.05)、胰脏(P<O.01)、胫骨(P<0.01)和输卵管(P<0.01)中锌含量显著提高,而肺脏和卵巢中锌含量无显著变化(P<0.05)。饲粮高钙使血清中锌含量显著降低(P<0.01),而对其它组织中锌含量的影响未达到显著水平(P>0.05)。

1. Weight gain (P>0.05), feed intake (P<0.05) and feed efficiency (P> 0.05) tended to increase with the increase in dietary zinc level although no apparent clinical syndrome appeared in the experiment. High dietary calcium had no significant effect on feed intake, weight gain and feed efficiency (P>0.05).2. High dietary zinc significantly increased kidney weight (P<0.05), oviduct weight and lenth (P<0.01), and significantly decreased tibia length (P<0.05). High dietary calcium significantly decreased overy weight (P<0.05), oviduct weight (P<0.05) and length (P<0.01).3. Serum alkaline phosphatase activity was significantly increased with the increase in dietary zinc level (P<0.01). Albumin content were lower in serums of high and low dietary zinc chickens than that of adequate dietary zinc chickens (P<0.05). High dietary zinc significanty increased serum globin content, but, serum total protein content was not affected by dietary zinc level (P<0.05). Serum alkaline phosphatase activity and total protein content were not affected by dietary calcium levels (P>0.05). High dietary calcium significantly decreased serum albumin content, and increased globin content (P<0.01).4. With the increase in dietary zinc, zinc contents in serum (P<0.01), liver (P<0.01), kidney (P<0.05), pancreas (P<0.01), tibia (P<0.01) and oviduct (P<0.01) were significantly increased, but no significant change occured in lung and ovary (P>0.05). High dietary calcium significantly decreased zinc content in serum (P<0.01), but had no significant effect on other tissues (P>0.05).