| The experiment studied the effects of the different levels of zeolite powder on production performance, blood biochemical index and immune indicators of dairy cows. The aim was to find the appropriate zeolite application in diet of cows. We provided the necessary data to support the application of zeolite in the production of dairy cows.One:33lactating dairy cows were selected with the same age, parity, lactation time and milk yield to randomly divide into three groups that were the control group, the treatment I and treatment II. Every treatment had11cows and reared under the same condition. Cows of three groups were respectively fed0g/d,90g/d and150g/d zeolite powder that were mixed in ration (three times one day). The pre-trail periods were7days and the trial periods were60days. The results showed that the milk yield, milk protein and total solids content in treatment II significantly increased in contrast to the control (P<0.05). Milk fat was highly significantly increased (P<0.01) and lactose content decreased (P<0.01) in contrast to the control. Non-fat solid matter content tended to increase (P>0.05). The lactose, milk fat, total solids in treatment I were highly significantly decreased in contrast to the control (P<0.01). This result showed that supplementing a certain level of zeolite could improve the production performance of the cows, and the suitable additive amount of zeolite was150g/d.Two:The experiment design and cows grouping were as the same as Part one. The blood was collected from cows’jugular vein at60th day. Serum was separated to analyze the amount of blood cells and serum biochemical index. The results showed that serum albumin in treatment II was significantly increased in contrast to the control (P<0.05) and highly signififcantly increased in contrast to treatment I (P<0.01). Total protein content, alkaline phosphatase, aspartate, alanine aminotransferase activity were higher in treatment II than that of control and treatment I, but there was no significant difference (P>0.05). Serum glucose, triglycerides, cholesterol levels decreased in treatment I and II in contrast to that of control, but it was not significantly differenent (P>0.05). Serum urea nitrogen was highly significantly decreased in treatment I in contrast to the control (P<0.01). Serum urea nitrogen was signififcantly decreased in treatment II in contrast to the control (P<0.05). The amount of blood leukocyte, neutrophil, platelet had improved trend in treatment I and treatment II in contrast to the control. The amount of blood lymphocyte, serum IgG and IL-2content were signififcantly in treatment II in contrast to the control (P<0.05). The amount of blood lymphocyte, IgG and IL-2content increased in treatment I in contrast to the control, but there was no significant difference (P>0.05). Serum lysozyme level was highly significantly improved in treatment II in contrast to the control and treatment I (P<0.01). The results showed that supplementing zeolite in ratin of dairy cows could reduce blood cholesterol, and improve the enzyme activity, the ability of the body’s metabolism and disease resistance ability. This experiment found the appropriate amount of zeolite was150g/d. |
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