The Influence Of Different Selenium Sources At Different Levels And Selenium-Iodine Interaction On Nutritional Effects And Meat Quality Of Gushi4C Broilers

Expt l.AppIicational effects of different selenium source on Gushi4C broilersA total of 420 one-day Gushi4C broilers were allotted to seven groups randomly, which were divided into the group of control, the groups of supplementing 0.15mg/kg, 0.30mg/kg and 0.45mg/kg with Sel-plex and the groups of supplementing 0.15mg/kg, 0.30mg/kg and 0.45mg/kg with sodium selenite respectively. Weak broilers were culled after one week prefeeding. 50 broilers (start weight 85-88g) were assigned to each group and fed with basic corn-soybean diets. The feeding duration of experiment was 42 days of 3 phrases. The effects of supplemental selenium of different sources at different levels on growing performance, carcass characteristics, serum enzyme parameters and meat quality parameters of Gushi4C broilers were measured.The results showed: The selenium requirements varied with growing stages of Gushi4C broilers. For whole periode, the higher average daily gain (ADG) was for the group of 0.30mg/kg sodium selenite and the better feed conversion rate (FCR or F/G) for the group of 0.30mg/kg Sel-plex. In early growing phrase, average body weight for the group of 0.45mg/kg Sel-plex was significantly increased (p<0.01) compared with the groups 0.15mg/kg, 0.30mg/kg Sel-plex, the group of 0.45mg/kg sodium selenite and the control. Feather scores were significantly increased by supplemental 0.45mg/kg selenium from Sel-plex (p<0.01).The lower carcass weight was for the group of 0.30mg/kg Sel-plrx than that group of sodium selenite at the same level (p<0.05), and the lower carcass yield was for the group of 0.30mg/kg Sel-plex than that of the group of 0.45mg/kg sodium selenite (p<0.01).Serum GSH-Px, SOD, Ta increased as selenium concentration increased in diets, T4 decreased as selenium concentration increased basically. GSH-Px activities of Sel-plex groups were higher significantly than those of the control (p<0.01). GSH-Px activities ofSel-plex groups were 11.02%, 5.15% and 5.83% higher respectively than those of sodium selenite groups at the same levels. The higher significantly SOD activities were for the groups of 0.45mg/kg selenium from Sel-plex and sodium selenite than those of the control (p<0.05). Serum enzyme activities of Sel-plex groups had higher correlations with selenium concentration in diets than those of sodium selenite groups did. In addition, transformation ration from T4 to TI for the groups of Sel-plex were higher than those groups of sodium selenite at the same levels.Supplemental Sel-plex helped improving the water holding capacity. Driploss of the control group was 2.57% higher than that of 0.15mg/kg Sel-plex and was significantly higher than those of the other groups (p<0.05). The higher cooking less was for the group of 0.15mg/kg sodium selenite than that of 0.45mg/kg Sel-plex (p<0.05). There was a tendency of declining MDA in thigh muscle as the supplemental selenium increased. The lower MDA in thigh muscle was for the two groups of 0.45mg/kg than that of the control group (p<0.05).Supplementing Sel-plex in diets could stabilize the meat color. The lower L* value (lightness) was for the group of 0.45mg/kg Sel-plex than that of 0.15mg/kg sodium selenite at 24h (Oh) (p<0.05). The lower a* value (redness) was for the groups of 0.15mg/kg, 0.45mg/kg Sel-plex and 0.45mg/kg sodium selenite than that of the two groups of 0.30mg/kg from Sel-plex and sodium selenite and the control group at 24h (Oh) (p<0.01). The higher b* value was for the group of the control at 48h than that of Sel-plex groups and 0.15mg/kg sodium selenite (p<0.01). During the observing period, there was a tendency that the variation of L*, a*, b* value were minimazed as selenium contents increased in diets.Selenium deposition increased as selenium concentration increased in diets. Selenium deposition in liver was higher than that of in thigh at the same level of selenium. Selenium deposition in liver for the group with supplementation of 0.45mg/kg Sel-plex was higher than that of the groups with supplementation of 0.15mg/kg Sel-plex...