Effects of different protein levels on growth performance,milk composition,antioxidant capacity,and immune function of Saanen dairy goats
The purpose of this study was to investigate the effects of daily feed with different protein levels on the growth per-formance,autoimmune function,milk composition,and antioxidant capacity of Saanen dairy goats.A total of 54 Saanen dairy goats were selected in the experiment,all in the middle of lactation.Then they were randomly divided into three groups:high protein group,control group,and low protein group.Among them,3 goats were used as a repeat,and 6 replicates were arranged in each treatment.The daily dietary CP contents of the three groups were 17.8%,15.2%,and 13.7%,respectively.The pre-experiment was 10 days and the formal experiment was 60 days.Results The results showed that:①Compared with the control group,the av-erage daily feed-to-weight ratio and feed intake of Saanen dairy goats in the high protein group were significantly reduced.②Com-pared with the control group,the milk yield of the high protein group increased significantly in the second half of the experiment.③In the high protein group,the protein content in the milk was significantly increased during the test,and the fat content in the milk was significantly decreased in the last 20 days.④The low protein group significantly reduced the total antioxidant capacity in the serum of Saanen dairy goats.In conclusion high protein group can significantly improve the growth performance and milk com-position of Saanen dairy goats.However,the low-protein group showed a risk of reduced antioxidant capacity in dairy goats.
different protein levelsdairy goatgrowth performancemilk compositionantioxidant capacity
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