| 摘要: |
| [目的]研究日粮苯丙氨酸水平对5～12周龄泰和乌骨鸡生产性能和组织黑色素含量的影响.[方法]选用28日龄泰和乌骨鸡81只,随机分成3组,每组设3个重复,每重复9只鸡(公母各半),饲养至12周龄.在5～8周龄3个处理组中日粮苯丙氨酸水平分别为6.79,9.14和11.49 g/kg,在9～12周龄3个处理组中日粮苯丙氨酸水平分别为6.37,8.28和10.19 g/kg.[结果]日粮苯丙氨酸水平对5～8周龄和9～12周龄泰和乌骨鸡的平均日增质量、平均料重比、平均日采食量均无显著影响(P>0.05).日粮苯丙氨酸水平显著影响8周龄泰和乌骨鸡胸肌的黑色素含量(P<0.05),但对腿肌和皮肤的黑色素含量均无显著影响(P>0.05),日粮苯丙氨酸水平为9.14 g/kg时,胸肌黑色素含量最高.日粮苯丙氨酸水平显著影响12周龄腿肌和皮肤的黑色素含量(P<0.05),但对胸肌的黑色素含量无显著影响(P>0.05);腿肌黑色素含量以6.37 g/kg苯丙氨酸水平组最高,而皮肤黑色素含量以8.28 g/kg苯丙氨酸水平组最高.[结论]通过调节日粮苯丙氨酸供给水平,可改善泰和乌骨鸡体内黑色素的沉积而不影响其生产性能. |
| 关键词: 泰和乌骨鸡 苯丙氨酸 生产性能 黑色素 |
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| 基金项目:国家自然科学基金，江西省自然科学基金，江西省科技厅农业科技攻关重点项目，江西省主要学科学术和技术带头人培养计划，江西省教育厅项目 |
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| Effects of dietary phenylalanine levels on performance and melanin contents in tissues of Taihe silky fowls aged from 5 to 12 weeks |
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| Abstract: |
| 【Objective】 This study was conducted to investigate the effects of dietary phenylalanine levels on performance and melanin contents in tissues of Taihe silky fowls aged from 5 to 12 weeks.【Method】 Eighty one 28 day old Taihe silky fowls were randomly allotted to 3 groups with 3 replicates of 9 birds each and were raised to 12 weeks of age.The birds were fed diets with one of phenylalanine levels of 6.79,9.14 and 11.49 g/kg at 5-8 weeks of age,and 6.37,8.28 and 10.19 g/kg at 9－12 weeks of age respectively. 【Result】 The average daily gain (ADG), feed to gain (F/G) and average daily feed intake (ADFI) were not influenced by dietary phenylalanine levels at 5－8 and 9－12 weeks of age (P>0.05).The melanin content in pectoral muscle was significantly influenced (P<0.05),but in leg muscle and skin were not affected by dietary phenylalanine levels at 8 weeks of age (P>0.05).The highest melanin content in pectoral muscle was observed when the dietary phenylalanine level was set at 9.14 g/kg.The melanin contents in leg muscle and skin were significantly influenced (P<0.05),but in pectoral muscle was not affected by dietary phenylalanine levels (P>0.05) at 12 weeks of age.The leg muscle and skin had highest melanin content when the dietary phenylalanine levels were set at 6.37 g/kg and 8.28g/kg at 9－12 weeks of age respectively. 【Conclusion】 The melanin contents in Taihe silky fowls could be improved by controlling the dietary phenylalanine to appropriate levels with no negative effects on performance. |
| Key words: Taihe silky fowl phenylalanine performance melanin |
