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饲粮代谢能和可消化赖氨酸水平对21~42日龄肉仔鸡生长性能及血清生化指标的影响

DOI: 10.3969/j.issn.1006-267x.2013.02.008

Keywords: 代谢能,可消化赖氨酸,生长性能,血清生化指标,肉仔鸡

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Abstract:

为研究饲粮代谢能(ME)、可消化赖氨酸(DLys)水平及其互作效应对21~42日龄肉仔鸡生长性能及血清生化指标的影响,试验采用2×3两因子交叉设计,包括2个ME水平:13.18、12.55MJ/kg,3个DLys水平:0.80%、0.95%和1.10%,依据理想氨基酸平衡模式配制6种饲粮。选择360只平均体重(718.6±28.6)g的21日龄爱拔益加肉仔鸡,随机分为6组,每组6个重复,进行21d的饲养试验,期末屠宰,同时测定血清生化指标。结果表明:高ME高DLys组具有最高的平均日增重、平均日采食量和最低的料重比(1.86),饲粮ME和DLys水平对平均日采食量存在极显著的互作效应(P<0.01);饲粮ME和DLys水平及其互作效应对屠宰率、全净膛率和腿肌率均无显著影响(P>0.05)。低ME高DLys组胸肌率(30.43%)最高、腹脂率(1.09%)最低,饲粮ME和DLys水平对胸肌率存在显著的互作效应(P<0.05);饲粮ME和DLys水平对血清尿素氮含量分别有极显著(P<0.01)和显著(P<0.05)影响,对血清谷草转氨酶活性有显著的互作效应(P<0.05),高ME高DLys组血清尿素氮含量最低。综合生长性能和屠宰性能的分析结果可知,在本试验条件下,对21~42日龄肉仔鸡,饲粮适宜ME和DLys水平分别为12.55MJ/kg和1.10%(ME/DLys=1.141MJ/g)。高ME高DLys(ME/DLys=1.198MJ/g)更利于代谢平衡,减少血清尿素氮含量。

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