a decreasing trendp < 0.05
Nitrogen Metabolism Indexes in Serum Compared with the control group, the serum ammonia level of broilers in the YS group showed a decreasing trend at 28 days ( p < 0.05, Figure 1 ).
Nitrogen Metabolism Indexes in Serum Compared with the control group, the serum ammonia level of broilers in the YS group showed a decreasing trend at 28 days ( p < 0.05, Figure 1 ).
Serum Immunoglobulin An increasing trend was seen in the contents of IgA and IgM in sera of the 28-day broilers of YSa, YS, and QS groups, as shown in Figure 3 , compared with those in the CON group ( p < 0.05).