The aim of this experiment was to study the effect of different levels and sources of dietery selenium supplementation on laying hen's production performance and egg quality. 648 hybrid and laying hens of Beijing You chicken and Lohm-ann-pink chicken with age in 23-week were randomly allocated into 12 groups according to experiment requirement to compare the effects of different doses of two sources of selenium on production performances and egg quality in laying hens for 8-week feeding in this study. Both selenium sources were added into the basal diet at 0. 3, 1.0, 2. 0, 3. 0,4. 0 and 5. 0 mg/kg of selenium, and 1 to 6 groups were added with sodium selenite while 7 to 12 groups with selenium-enriched yeast. The results indicated that the selenium addition of less than 5. 0 mg/kg tended to increase the laying rate(P>0. 05) and had no significant negative impacts on egg quality,whatever its sources. The selenium-enriched yeast had better effects than sodium selenite on production performances and egg quality in laying hens. The best selenium level in laying hen's feed was separately 2. 0 and 3. 0 mg/kg in the form of sodium selenite and selenium-enriched yeast. The group of selenium-enriched yeast was significant higher than the group of sodium selenite on the average daily feed intake and the eggshell strength(P<0. 05) , while the group of sodium selenite was significant higher than the group of selenium-enriched yeast on albumen height and haugh unit(P<0. 05).%试验旨在研究添加不同水平的亚硒酸钠和酵母硒对产蛋鸡生产性能和蛋品质的影响.试验选用23周龄北京油鸡和罗曼粉杂交一代产蛋母鸡648只,随机分为12组,每组6个重复,每个重复9只鸡,进行为期8周的饲养试验.试验1～6组在基础日粮中分别添加含硒0.3、1.0、2.0、3.0、4.0、5.0 mg/kg的亚硒酸钠,试验7～12组在基础日粮中分别添加含硒0.3、1.0、2.0、3.0、4.0、5.0 mg/kg的酵母硒.结果表明,在产蛋鸡的饲料中添加5.0 mg/kg以内的亚硒酸钠或酵母硒都有提高产蛋率的趋势(P＞0.05),且对蛋品质无明显不良影响.若以提高产蛋率为目的,亚硒酸钠的添加水平以2.0 mg/kg为宜,酵母硒的添加水平以3.0 mg/kg为宜.酵母硒的使用效果优于亚硒酸钠.酵母硒组采食量和蛋壳强度显著高于亚硒酸钠组(P＜0.05),亚硒酸钠组蛋白高度和哈氏单位显著高于酵母硒组(P＜0.05).
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