【作者】 赵丽红； 计成； 陈旭东； 胡新旭； 马秋刚；

【Author】 Zhao-lihong,Ji-cheng,Chen-xudong,Hu-xinxu,Ma-qiugang (National Laboratory of Animal Nutrition,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China)

【机构】 中国农业大学国家动物营养重点实验室；

【摘要】 为了研究日粮不同代谢能和赖氨酸水平对AA肉鸡生长性能和屠宰性能的影响,试验选用160只1日龄AA肉公雏,随机分为5个处理,每个处理32个重复,每重复1只鸡,实行单笼饲养。试验采用2因子(能量和赖氨酸)×2水平(低于和高于对照组)随机区组设计,设一对照组(等于NRC,1994),2个能量水平分别为12 970kJ/kg、13 807kJ/kg;2个赖氨酸水平0～3周龄分别为1.0%、1.2%,4～6周龄分别为0.9%、1.1%,对照组能量水平0～6周龄为13 389kJ/kg,赖氨酸水平0～3周龄为1.1%,4～6周龄为1.0%。42日龄屠宰,试验结果表明:1)日粮代谢能水平从12 970kJ/kg提高到13 807kJ/kg,肉鸡平均体重增加12.67%,料重比降低7%(P<0.01);日粮赖氨酸水平提高20%,体重显著增加12.38%(P<0.05),料重比降低3.84%(P<0.01);日粮代谢能和赖氨酸对料重比有显著的互作效应(P<0.05);2)随着能量水平的提高,屠体重、全净膛重、胸肌重、腿肌重、腹脂重和腹脂率相应提高,高能组显著高于中、低能组(P<0.05),赖氨酸水平对屠体重、全净膛重、胸肌重和胸肌率产生极显著的影响(P<0.01),与低赖氨酸组相比,高赖氨酸日粮组肉鸡屠体重增加12.33%、全净膛重增加12.62%、胸肌重增加28.53%、胸肌率提高3.11%,能量和赖氨酸水平对肉鸡腹脂重有显著的互作效应(P<0.05);3)日粮能量水平为13 807kJ/kg,赖氨酸水平0～3周龄为1.2%、4～6周龄为1.1%时AA肉鸡获得最佳生产性能和屠宰性能,与实际生产中应用的NRC(1994)能量和赖氨酸水平相比,AA肉鸡多赢利1.44元/只。更多还原

【Abstract】 This study was conducted to evaluate the effects of dietary energy level and lysine level on performance and carcass characteristics of 42-d-old broilers and to determine the optimum level of energy and lysine of AA broiler.A total of 160 1-d-old male broiler chicks were randomly assigned to five experimental dietary treatments in a 2×2 randomized block design and a control treatment with 32 replicates of one bird per replicate pen.Energy and Lysine concentrations were lower(L) or higher(H) than NRC(1994) recommendations which comprised of four trial diets,respectively,varied by 100 kcal of ME/kg of diet and 0.1%ratio from 0 to 3 weeks of age and from 4 to 6 weeks of age,and which according with NRC(1994) recommendations were moderate(M) presented the control group diet.Results showed that 1) when the levels of dietary energy were increased from 3100Kcal/kg to 3300Kcal/kg,the body weight of broilers was increased by 12.67%and F:G ratio decreased by 7%;with a 20% increase in the level of dietary lysine,the body weight significantly increased by 12.38%(P<0.05) and FCR decreased by 3.84%.There was an obvious interaction effect on F:G ratio. (P<0.05).2) The carcass weight,eviscerated weight,breast weight,thigh weight, abdominal fat weight and abdominal fat yield were increased with the increase of dietary energy and lysine.When the levels of dietary lysine were increased by 20%,the carcass weight, eviscerated weight,breast muscle weigh and breast muscle yield were significantly improved by 12.33%,12.62%,28.53%,and 3.11%,respectively.There was an obvious interaction effect on abdominal fat weight(P<0.05).3) Birds got the optimum growth and carcass performance when the levels of dietary energy were 3300Kcal/kg,the levels of dietary lysine were 1.2%from 0 to 3 weeks of age and were 1.1%from 4 to 6 weeks of age.The profits of birds in HH was more 1.44yuan/bird than that of present NRC(1994) group.更多还原