本试验旨在研究饲粮不同粗蛋白质水平对26 ～ 41周龄的鲁西斗鸡生产性能及蛋品质的影响.试验选用26周龄(1.952±0.288) kg健康的鲁西斗鸡200只,随机分为4组,每组5个重复,每个重复10只.试验采取单因素试验设计,4个饲粮粗蛋白质水平依次为:14.0％、15.5％、17.0％和18.5％,各组均限饲,且投料量一致.试验期为16周.结果表明:在鲁西斗鸡产蛋期(26 ～ 41周龄),饲粮粗蛋白质水平对平均蛋重没有显著影响(P＞0.05).在试验前期(26～29周龄),饲粮粗蛋白质水平对平均周产蛋量、产蛋率和料蛋比均无显著影响(P＞0.05)；在试验中期(30 ～37周龄),30 ～33周龄17.0％饲粮粗蛋白质水平组平均周产蛋量显著高于其他各组(除30 ～31周龄15.5％饲粮粗蛋白质水平组外)(P＜0.05),30 ～ 31周龄和36 ～ 37周龄产蛋率显著高于14.0％组和18.5％组(P＜0.05),32 ～ 35周龄产蛋率显著高于15.5％组(P＜0.05),但是各组间30 ～ 37周龄料蛋比差异不显著(P＞0.05)；在试验末期(38 ～ 41周龄),18.5％饲粮粗蛋白质水平组平均周产蛋量显著高于其他各组(P＜0.05),产蛋率显著高于14.0％组和15.5％组(P＜0.05),料蛋比显著低于15.5％组(P＜0.05).此外,33周龄时,随着饲粮粗蛋白质水平提高,蛋黄颜色有下降趋势(P=0.09)；41周龄时,17.0％和18.5％饲粮粗蛋白质水平组蛋白高度和哈氏单位显著高于14.0％组和15.5％组(P＜0.05).综合以上结果,鲁西斗鸡产蛋期适宜的饲粮粗蛋白质水平:前期(26 ～29周龄)为14.0％；中期(30 ～ 37周龄)为17.0％；后期(38 ～41周龄)为18.5％.%A single factor design was used to a 16-week experiment to study the effects of dietary crude protein level on performance and egg quality of Luxi game chickens aged 26 to 41 weeks. Two hundred 26-week-old Luxi game chickens with an average body weight of (1. 952 ± 0. 288) kg were randomly distributed into four groups with five replicates per group and ten hens per replicate. Four dietary crude protein levels were 14.0% , 15. 5%, 17. 0% and 18. 5% . All birds were restrictively fed the same amount of diets. Results showed that average egg size of Luxi game chickens aged 26 to 41 weeks was not significantly affected by dietary crude protein level (P >0. 05). From 26 to 29 weeks of age, dietary crude protein level did not affect laying rate, the ratio of feed to egg and average weekly egg mass of Luxi game chickens (P > 0. 05). From 30 to 37 weeks of age, the ratio of feed to egg was not significantly affected by dietary crude protein level (P >0. 05). From 30 to 33 weeks of age, except 15.5% group at 30 to 31 weeks of age, average weekly egg mass of 17.0% group was significantly higher than that of the other groups (P <0. 05). From 30 to 31 weeks of age, laying rate ofrn17. 0% group was significantly higher than that of 14. 0% and 18. 5% groups (P <0. 05) , and the same result was recieved at 36 to 37 weeks of age as well. From 32 to 35 weeks of age, laying rate of 17.0% group was significantly higher than that of 15. 5% group (P <0. 05). From 38 to 41 weeks of age, average weekly egg mass of Luxi game chickens of 18. 5% group was significantly higher than that of the other groups (P < 0. 05) , laying rate was significantly higher than that of 14. 0% and 15.5% groups (P <0.05) , and the ratio of feed to egg was significantly higher than that of 15. 5% group ( P < 0. 05). Meanwhile, at 33 weeks of age, with the increase of dietary crude protein level, there was a downward trend in yolk color of Luxi game chickens (P=0.09);at41 weeks of age, albumen high and Haugh unit of Luxi game chickens of 17.0% andrn18. 5% groups were significantly than those of 14. 0% and 15. 5% groups (P <0. 05). In conclusion, the dietary appropriate crude protein levels for Luxi game chickens during the early period (26 to 29 weeks of age) , middle period (30 to 37 weeks of age) , and late period (38 to 41 weeks of age) are 14. 0% , 17. 0% and 18.5% , respectively. [Chinese Journal of Animal Nutrition, 2012, 24(10) :2028-2035]
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