Effects Of Algae On Production Performance, Egg Quality And Blood Physiological And Biochemical Parameters Of Laying Hens

The experiment was conducted to investigate the effect of different levels of algae on production performance, egg quality and blood physiological and biochemical parameters of laying hens, and the preliminary discussion to their mechanism was indicated. These data provide the academic and practical basis for the application of algae in layer production.In the experiment , 576 30-week-old layers were randomly divided into four groups, Each group was assigned 3 replications and 48 layers per replication. The control group I were fed with the basic diets , II III and IV group fed with the basic diets containing 1%,3% and 5% algae. Feed and water were provided for ad libitum consumption. The period was divided into two phases including 7 days of pre-experiment and 40 days of experiment. Egg quantity and feed intake were recorded every day. At the end of the experiment production performance, egg quality and blood physiological and biochemical parameters were measured. The results showed that:(1) Compared to control group, the rate of producing eggs ,quantity of eggs and feed efficiency were increased as dietary algae increased (P<0.01) .No significant difference in egg weight and feed consumption was observed among the treatments (P>0.05) .(2) The egg-shaped index eggshell thickness relative eggshell weight haugh unit egg yolk coefficient and egg yolk comparative weight were improved but no significant difference was observed (P>0.05) .The treatment groups were better than the control group in egg yolk color (P<0.01) ,111 and IV were better then I (P<0.01) and IV was the best .The effects of algae on the content of water protein in egg white and egg yolk were changed little (P>0.05) . The amount of fat and phosphor lipid in the egg yolk were raised (P<0.05) .(3) During the experiment ,The contents of cholesterol in egg yolk were evidently reduced (P<0.01 or P<0.05) with days. But the contents of iodine were remarkably increased, and get the top numerical value at the twelfthday, the IIIgroup was the highest(33.12μg/g) and was 8.2 times to the control group (4.05μg/g) .(4) The contents of blood fat in serum were changed with different level algae, the total cholesterol and triglyceride were decreased (P<0.05or P>0.05) but the contents of serum high density lipoprotein were increased by 2.22% (P>0.05) 16.00% (P<0.05 ) 16.30%(P<0.05) ,respectively.(5) No significant difference in GOT GPT and LDH was observed among the treatments(P>0.05) using these algae in feeding. Compared with the control alkaline phosphatase (AKP) and concentrations of calcium were increased by 1.79% (P>0.05X 12.33% (PO.01 X 21.28% (PO.01) and 1.59% (P>0.05X 4.17% (PO.05 X 8.55% (PO.05), respectively ,and serum level of phosphorus rarely changed (P<0.05) .(6) With the increasing of dietary algae contents, serum activity of superoxide dismutase (SOD) significantly increased (PO.01) , serum activity of GSH-Px increased too, butthere was no significant difference between land II (P>0.05X III and IV (PO.01) .(7) Compared with the control serum levels of triiodothyronine (T3) and thyroxine (T4) were increased by 6.4%(PO.05 X 21.6%(PO.01 X 26.4%(PO.01 )and 2.67%(PO.01 X 15.83% (PO.01), 15.68% (PO.01) respectively, II with IIL IVgroup' s difference remarkable(PO.05), but there was no significant difference between III and IV(P>0.05). Parathormone (PTH) in serum changed little (P>0.05) .(8) After taking the dietary algae, follicle-stimulating hormone (FSH) and estradiol (E2) were increased by 6.93% (PO.01), 12.87% (PO.01 X 15.18% (PO.01) and 5.27%(P>0.05X 18.66% (P>0.05X 23.42% (PO.05) , respectively, but levels of luteinizing hormone (LH) and progesterone (P) in serum were unaffected..(9) It was better to add 3% to 5% algae to the diet.