Effects Of Asparagus Stalks Extract On Growth And Biochemical Markers Of Immune In Laying Hens

This article is about the effect of asparagus stalks extract on the product performance, slaughter performance, blood parameters, immune performance and instestinal tract’s morphology of laying hens during the replacement period, which aimed to supply a theoretical foundation for the use of asparagus stalks extract. This article is simple factor design of experiment.Selecting an age(9 weeks old), body weight similar and in good health plume laying hens, then, randomly dividing into 5 groups(n=5 replicates of 6 birds). Group I, as a control group, was fed with basal diet while other groups that were experimental groups were respectively fed with 0.5%, 0.75%, 1.0% and 1.25% of asparagus stalks extract of basal diet. After 9 weeks, we measured the produce performance, slaughter performance, blood parameters, immune performance and instestinal tract’s morphology. The results showed that :1. Up to a point, asparagus stalks extracts could accelerate the growth og chicken and average daily feed intake during some stages of replacement period. During 9 to 12 weeks old, the daily gain and average daily feed intake were significantly greater than groupⅠ( P<0.05). In the gourse of 12 to 15 weeks old, all experimental groups were significantly greater than control group in the dail gain and average daily feed intake(P<0.05). All experimental groups were greater than control group in the average daily feed intake during 9 to 18 weeks old( P<0.05).2. Asparagus stalks extract improved the slaughter performance of laying hens during the replacement period to a certain extent. At the age of 12 week. In GroupⅣ all eviscerated rate increased significantly(P<0.05﹚compared to GroupⅠ. Abdominal fat percentage in GroupⅡand Ⅳ decreased significantly(P<0.05﹚. At the age of 15 weeks, the wings rate of GroupⅤincreased significantly(P<0.05﹚. At the age of 18 weeks, dressing percentage in GroupⅡ, Ⅲ and Ⅳ and Ⅴ increased significantly.3. Asparagus stalks extract could raised increased high density lipoprotein cholesterol and decreased urea nitrogen, uric acid in serum in the laying hens during repalcement period. Compared to Group Ⅰ, urea in Group Ⅱ, Ⅳ and Ⅴ were significantly decreased(P<0.05﹚ at 12 week old. At the age of 15 weeks, high density lipoprotein cholesterol in GroupⅣ andⅤ were increased singnificantly(P<0.05﹚compared to GroupⅠ. At the age of 18 weeks old, the urea were decreased significantly(P<0.05﹚.4. Asparagus stalks extract improved the immunologic mechanism to a certain extent. Spleen index in GroupⅣ, the lgG contein in Group Ⅲ, Ⅳ and Ⅴ and lgA contein in GroupⅡand Ⅳ were significantly raised(P<0.05﹚compared to GroupⅠ. At the age of 15 weeks, spleen index, rtymus index and bursa of Fabricius index, the contein of lgM, lgA and lgG raised but no significance copared to GroupⅠ(P>0.05﹚. At the age of 18 weeks, spleen index in GroupⅡ, Ⅳ and lgM contein in GroupⅡ,Ⅴ were incresed significantly(P<0.05﹚.5. Asparagus stalks extract improved the intestinal tract’s orphology of laying hens during the replacement period to a certain extent. At the age of 12 weeks, chicks duodenal wall thickness in GroupⅢ and Ⅳ were decreased significantly(P<0.05﹚and the villus height of each experimental groups were increased significantly(P<0.05﹚compared to GroupⅠ.The villus height/crypt depth in Group Ⅳ and Ⅴwere increased significantly(P<0.05﹚.At the age of 18 weeks old, the crypt depth in GroupⅢ were decresased significantly(P<0.05﹚but the villus height/crypt depth were opposite compared to GroupⅠ.