Feed Intake Of Hens And The Role Of Daidzein And F89 In Control Of Feed Intake And Laying Performance In Hens And Endocrine Mechanisms Involved

Observation of feed intake pattern on hens, and the role of daidzein and F89 in control of feed inttTke and laying performance in hens and involved endocrine mechanisms were studied in this research , The present research included 5 series: Series 1: Observation of feed intake pattern on young hensThe development of Food Intake Data Acquisition System (FIDAS) and the application of this system to the observation on the feed intake of young hens. The data which acquired by FIDAS included the feed intake, the time of feed intake and the number of meal, this series experiment proved that FIDAS was fit for the study on feed intake behavior of hens.Series 2:Effect of diet supplemented with daidzein on the feed intake in laying hens and endocrine mechanism involved8 Twenty-eight-week-old laying hens were used to evaluate the effect of diet supplemented with daidzein on the feed intake behavior in the laying hens. The experiment was divided into two periods: First, basal diet period; Second, basal diet+6mg/kg daidzein; Compared to control period, the feed intake (18.47%,p<0.01) and the number of meal(23.81% p<0.01) of basal diet +daidzein period were increased; the time of feed intake(21.32%) was reduced; Serum 17 P -estradiol (13. 22% p<0. 05) .insulin (21.83%, p<0.05)andleptin levels were increased, whereas serum glucose levels were reduced. Series 3: Effect of diet supplemented with daidzein on'the feed intake inolder laying hens and endocrine mechanism involved 8 Fourty-three-week-old laying hens were used to evaluate the effect of diet supplemented with daidzein on the feed intake in older laying hens. The experiment was divided into two periods: First, basal diet period; Second, basal diet +6mg/kg daidzein; Compared to control period, the feed intake and the number of meal(50.43%, p<0.01) of basal diet +daidzein period were increased; the time of feed intake(32.29% p<0. 01) was reduced; Serum 173 -estradiol .insulin (21.23%, p<0.05) and leptin levels were increased, whereas serum glucose levels (13.81% p<0. 05) were decreased.Series 4: Affect on feed intake and related endocrine status of laying hensInfusion of F89 into jugular vein8 Thiry-five-week-old laying hens were implanted with chronic jugular vein canula and used to investigate the effect of intravenous administration of F89 on Feed intake and plasma parameters. The results showed that the infusion of F89(0. Img/kg.BW) into jugular vein enhanced the feed intake, increased the number of meal and the time of feed intake, decreased plasma glucose levels, elevated the plasma levels of insulin and leptin.Series 5: Effect of diet supplemented with daidzein or F89 on performancein hens fed ad libitum60 Thirty-week-old hens were randomized into 3 groups: basal diet, basal diet +6mg/kg daidzein, basal diet +2mg/kg F89. The blood samples were collected in the 16th day, 39th day and 64th day. Compared to control, the feed intake of basal diet +daidzein group was increased, and laying performance was improved; Serum leptin , 17 3 -estradiol, LH and insulin levels were increased; The feed intake of basal diet+F89 group was also increased .whereas the laying performance was not altered , Serum leptin and insulin levels increased, but serum LH and 173 -estradiol levels dissimilar during different period.In conclusion, FIDAS fit for the study of feed intake on hens, and daidzein(6mg/kg diet) can improve the performance and regulate concentrations of some blood hormones and metabolic parameters in laying hens. It seems that the effects of daidzein may be partly related to the alteration of blood 17 3 -estradiol, Leptin, LH,etc; F89 also increased feed intake, whereas without similar effects on egg production performance , some blood hormones and metabolic parameters in laying hens during different period.