Abstract: The objective of this study was to investigate effects of organic trace minerals Fe,Zn and Mn supplemental levels on eggshell quality of laying hens.A total of 450 Hy-line variety brown laying hens aged 70 weeks were randomly divided into 5 groups with 6 replicates per group and 15 hens per replicate.Experimental groups were control group (basal diet) and four treatment groups (basal diet add 0.05%,0.1%,0.2% and 0.4% organic trace minerals).The eggshell quality and blood biochemical indexes were detected respectively in each 10 days.The results showed that 0.2% group significantly decreased egg broken rate compared with the control group (P<0.05);The supplementation of complex organic trace minerals significantly increased eggshell strength and color depth compared with the control group (P<0.05),and eggshell strength and color depth in 0.2% group higher than the other groups in observed values;The elements composition of eggshell in 0.2% group,Significantly higher than the Control group(P<0.05);The concentration of carbonic anhydrase and Calcium in blood serum significantly higher in 0.2% group and 0.4% group (P<0.05) compared with other groups,and the concentration of hemoglobin in 0.2% group also significantly higher than the other groups;Taken together,diets adding with complex organic trace minerals had certain improvement to eggshell quality of laying hens in the late period and the addition of 0.2% in diet showed a better effect in the present study.

Key words: Organic trace minerals, Iron, Zinc, Manganese, Eggshell quality

CLC Number: 

• S143