| The purpose of this paper was to study effect of dietary selenium (Se) mixture from two sources at different levels on production performance (PP), egg quality (EQ), whole-egg’s Se concentration (WESC), reproduction performance (RP) and day-old progeny’s quality (DOPQ) of Beijing You (BY) chicken breeder, which would provide technical guidance for the application of high-level’s Se in production of BY chicken breeder.Experiment1, effect of dietary Se from different sources at high levels on PP, EQ and WESC was studied in breeder hen. Six hundred and forty eight breeder hens of hybrid of BY chicken and Lohmann-pink chicken (23weeks old) were used in this9-week experiment, including one week pretesting period. Sodium selenite (SS) and Se-enriched yeast (SY) were supplemented into the basal diet at0.3,1.0,2.0,3.0,4.0or5.0mg/kg in a2×6factorial treatment arrangement. Each treatment was replicated six times. The results showed that:(1) Feed intake was significantly higher in group SY than group SS in hen (P<0.05). PP was not affected by levels of Se (P>0.05).(2) Eggshell thickness and eggshell strength were significantly higher in group SY than group SS (P<0.05), albumen height and Haugh unit were significantly lower in group SY than group SS (P<0.05).(3) WESC increased significantly in groups Se1.0-5.0mg/kg compared with group Se0.3mg/kg. WESC increased as SS or SY supplementation increased. WESC was significantly higher in group SY than group SS. Dietary Se of SY1.0mg/kg or SS2.0mg/kg could meet the criterion of Se-enriched eggs, in which the whole-egg’s Se content was beyond25μg per egg.Experiment2, effect of dietary Se mixture of SS and SY at different levels on PP, EQ, WESC, RP and DOPQ was studied in breeder hen. Four hundred and eighty six breeder hens of BY chicken (37weeks old) were used for this12-week experiment, including one week pretesting period.The mixture of SS and SY was supplemented into the basal diet at SS0.3, SS0.3and SY0.6, SS0.3and SY0.8, SS0.3and SY1.0, SS0.6and SY0.6, SS0.6and SY0.8, SS0.6and SY1.0, SS1.0and SY0.6, or SS2.0mg/kg with a single factorial treatment arrangement. Each treatment was replicated six times, and the treatment with SS0.3mg/kg was the control. The results showed that:(1) PP and EQ were not affected by levels of Se.(2) WESC was significantly higher in test groups than control (P<0.05). WESC significantly increased as Se supplementation increased (P<0.05).(3) Hatching eggs’fertility rate (HEFR) in2nd-7th groups and hatching eggs’hatchability rate (HEHR) in2nd-5th groups were significantly higher than control (P<0.05). There was no significant difference in HEFR and HEHR among2nd-5th groups (P>0.05). Fertilized eggs’hatchability rate (FEHR) and healthy chick rate (HCR) were not affected by levels of Se.(4) Se concentration of day-old chick’s liver and kidney was significantly higher in test groups than control (P<0.05). Se concentration of day-old chick’s liver and kidney significantly increased as Se supplementation increased (P<0.05). Shank length of day-old chick was significantly longer in6th-7th groups than control (P<0.05). Body weight of day-old chick was not affected by levels of Se (P>0.05).Experiment3, effect of dietary Se mixture of SS and SY on daily intake and RP of breeder roosters was studied at diferent levels. Fifty breeder roosters of BY chicken (65weeks old) were used for this9-week experiment, including one week pretesting period. The mixture of SS and SY was supplemented into the basal diet at SS0.3, SS0.3and SY0.3, SS0.3and SY0.6, SS0.3and SY0.8, SS0.3and SY1.0mg/kg with a single factorial treatment arrangement. Each treatment was replicated two times, and the treatment with SS0.3mg/kg was control.The results showed that:(1) Daily intake was not affected by levels of Se (P>0.05).(2) HEFR was significantly higher in2nd group than control (P<0.05). HEFR was not significantly different in3td-5th groups than control (P>0.05). HEHR,FEHR and HCR were not significantly different among five groups (P>0.05).Conclusions of this paper were as follows:(1) It not only met the criterion of Se-enriched egg for supplemented Se mixture of SS0.3and SY1.0mg/kg, but also promoted RP and DOPQ of breeder hens in BY chicken, while there was no significant negative influence on PP and EQ.(2) The RP of breeder roosters was increased significantly for supplemented Se mixture of SS0.3and SY0.3mg/kg in BY chicken.(3) Eggshell thickness and eggshell strength were significantly higher in groups SY than groups SS (P<0.05), and albumen height and Haugh unit were significantly lower in groups SY than groups SS (P<0.05). |
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